Hormone Therapy

Hormone Replacement Therapy (HRT)#

What HRT Does#

Hormone therapy works by shifting the dominant hormone in your system—either introducing testosterone to suppress estrogen's effects, or introducing estrogen (often with testosterone blockers) to suppress testosterone's effects. The result is a gradual development of secondary sex characteristics associated with the dominant hormone: a second puberty, essentially, that unfolds over months and years.

The timeline matters. Unlike surgery, which produces immediate physical changes, HRT is slow. Voice deepening on testosterone typically begins within the first few months but continues developing for one to two years. Breast development on estrogen can take three to five years to reach full potential. Fat redistribution, muscle changes, body hair patterns—all of these shift gradually, often in ways you won't notice day-to-day but will recognize when you compare photos from six months apart.

I remember the first time someone who hadn't seen me in a year commented on how different I looked. I couldn't see it myself—the changes had happened so incrementally that they felt invisible. But looking back at photos from before I started T, the difference was undeniable. That's the strange gift of HRT's slowness: you get to live into the changes rather than having them thrust upon you all at once.

This gradualness has advantages beyond the psychological. It gives you time to assess how you feel about changes as they happen. Most HRT effects can be stopped or reversed (to varying degrees) if you change your mind early in the process. But some changes become permanent relatively quickly—voice deepening on testosterone, for instance, or breast development on estrogen. Understanding which changes are reversible and which aren't is essential for making informed decisions.

Masculinizing Hormone Therapy#

Testosterone is the primary hormone used for masculinization, and it's available in several forms with different administration schedules, absorption rates, and practical considerations.

Injectable testosterone, typically cypionate or enanthate, is the most common and often most cost-effective option. You inject it intramuscularly or subcutaneously, typically every one to two weeks, and after training from your provider, most people do this at home. The advantage is reliable absorption and flexibility in dosing. The disadvantage is that some people experience mood or energy fluctuations as hormone levels peak after injection and decline before the next dose. I've always done my injections weekly rather than biweekly—I found the emotional rollercoaster of every-two-weeks dosing exhausting, with a noticeable crash in the days before my next shot. Splitting the dose into smaller, more frequent injections smoothed things out considerably.

Topical testosterone, available as gels or creams under brand names like AndroGel and Testim or as generic compounded formulations, provides more stable daily hormone levels since you apply it every day. The main considerations are cost (topicals tend to be more expensive), the need to avoid skin contact with others until the gel dries completely, and the daily routine itself—some people find it grounding, others find it tedious. Testosterone patches offer another daily-application option with steady hormone release, though skin irritation at the application site is a common complaint.

For those who want to think about their HRT as infrequently as possible, long-acting injectable testosterone (undecanoate, brand name Aveed in the US) is administered every ten to twelve weeks by a healthcare provider after an initial loading phase. This approach requires clinic visits for each injection and is often more expensive, but for some people the trade-off is worth it.

Typical starting doses for people seeking full masculinization range from 50 to 100mg weekly of injectable testosterone, adjusted based on blood levels and how you feel (Hembree et al., 2017). For those seeking more subtle changes—often described as "low-dose" or "microdose" testosterone—doses might be 20 to 40mg weekly or equivalent. The goal with low-dose approaches is typically slower, more controlled changes that allow you to find a stopping point that feels right rather than pursuing maximum masculinization.

The first changes most people notice are increased energy, heightened libido, and clitoral growth—often within the first few weeks to months. Menstruation typically stops within two to six months, though this varies considerably between individuals. Voice deepening usually begins within three to twelve months and is among the permanent changes; once your vocal cords have thickened, stopping testosterone won't reverse that shift. Facial and body hair growth is gradual, developing over one to five years and influenced heavily by genetics—if the men in your family can't grow beards, testosterone won't override that blueprint. Fat redistribution away from hips and toward the abdomen happens over months to years, as does the increase in muscle mass that continues with ongoing testosterone use.

Feminizing Hormone Therapy#

Feminizing HRT typically combines estrogen with an anti-androgen (testosterone blocker), though some people use estrogen alone—particularly after orchiectomy, when testosterone production has been surgically eliminated.

Estradiol is the form of estrogen most commonly used, and it's available as pills (taken orally or dissolved under the tongue), patches, injections, and topical gels or creams. Oral estradiol is convenient and widely available, and taking it sublingually—letting it dissolve under the tongue—may reduce strain on the liver compared to swallowing (Unger, 2016). Typical doses range from 2 to 8mg daily, depending on goals and individual response.

Transdermal estradiol, delivered through patches or gels, provides steady hormone levels and bypasses the liver, which may reduce blood clot risk—an important consideration for anyone over 40 or with other clotting risk factors (T'Sjoen et al., 2019). Patches are typically changed once or twice weekly. Injectable estradiol (valerate or cypionate) is administered every one to two weeks and provides reliable absorption; some people find injections produce more stable levels and emotional equilibrium than oral administration.

Anti-androgens suppress testosterone production or block its effects. The most common in the US is spironolactone, a daily pill that also acts as a diuretic—meaning you'll urinate more and need to stay hydrated. Spironolactone requires monitoring potassium levels through regular blood work. Outside the US, cyproterone acetate is common; it's more potent but carries its own risks, including potential effects on mood and liver function. GnRH agonists are another option—very effective but typically more expensive.

After orchiectomy, many people find they no longer need anti-androgens since the primary testosterone source has been removed. Estrogen alone may be sufficient, often at lower doses than before surgery. This is one of the ways surgery can simplify long-term HRT management—fewer medications, fewer side effects, more straightforward maintenance.

Progesterone remains controversial in feminizing HRT. Some providers and patients report it enhances breast development, improves mood, and supports libido. Others find no benefit or experience negative effects. The research is limited and inconclusive (Coleman et al., 2022). If you're curious, it's worth discussing with your provider as something to potentially try and evaluate rather than dismissing outright.

The timeline for feminizing changes begins with skin softening, often within weeks. Breast development starts within the first few months as tenderness and early growth, continuing for several years—patience is essential here, as full development can take three to five years. Fat redistribution to hips and thighs develops over one to three years. Body hair becomes finer and sparser. Spontaneous erections decrease, often significantly. Many people report emotional changes—frequently described as a wider range of accessible feelings—in the first months of treatment.

Estrogen does not change bone structure or voice pitch. Voice training is often necessary for transfeminine people seeking to alter their vocal presentation—this is a skill that can be developed through practice, often with the help of a speech-language pathologist or voice coach.

Nonbinary and Customized Approaches#

The standard frameworks—"masculinizing" and "feminizing"—assume binary endpoints that don't reflect many people's goals. If you want some changes but not others, or want to pause at a particular point, or want a combination that doesn't fit either standard path, you're not alone. The WPATH Standards of Care explicitly recognize that gender-affirming care should be individualized based on each person's unique goals and needs (Coleman et al., 2022).

Low-dose or microdose regimens involve taking lower amounts of hormones to produce slower, subtler changes. This allows you to assess how you feel as changes develop and potentially stop at a point that feels right rather than pursuing full masculinization or feminization. Some people stay on low doses indefinitely; others use them as a starting point before deciding whether to increase.

Selective goals might mean wanting a deeper voice but minimal body hair, or wanting breast development but maintaining erectile function. Hormones don't work à la carte—you can't pick exactly which changes you'll get—but dose levels, duration, and timing all influence outcomes. Working with a knowledgeable provider to understand what's likely, what's possible, and what's permanent helps you make informed choices within the constraints of biology.

Mixed approaches are also possible. Some people cycle between hormones or use combinations that don't fit standard protocols. These paths often require providers who are flexible and willing to work with non-standard goals—not all are, which makes finding the right provider especially important for people whose goals don't fit neatly into binary frameworks.

I'm an example of a non-standard path. After nullification surgery removed my testes, I chose to continue testosterone rather than switching to estrogen or going without hormones. My primary dysphoria was anatomical—having a penis and testicles felt wrong—but I don't experience dysphoria about testosterone's effects on my body. I like how I feel on T: the muscle mass, the energy, the body hair. Continuing testosterone after nullification meant deliberately choosing to maintain that hormonal profile rather than defaulting to it because of organs I was born with. That distinction—between having a hormonal balance imposed by your anatomy versus choosing one that feels right—matters to me. It's the difference between circumstance and agency.

This isn't the right path for everyone, and it's not meant to be a template. It's one example of how surgical and hormonal decisions can be made independently based on what actually causes you dysphoria versus what doesn't. Your combination might look completely different, and that's exactly as it should be.

HRT and Surgical Planning#

If surgery is in your future, understanding how hormones interact with surgical requirements and recovery is essential planning.

Pre-surgical hormone requirements vary by procedure and surgeon. Some surgeons require 12 months of hormone therapy before genital surgery; others don't (Coleman et al., 2022). For metoidioplasty, longer testosterone use (often two or more years) maximizes clitoral growth before surgery—the more growth achieved hormonally, the more tissue surgeons have to work with. For orchiectomy or vaginoplasty, surgeons may have estrogen duration requirements. Always clarify requirements early in your surgical planning—discovering at the consultation that you need another year of HRT before you're eligible is frustrating and can derail carefully laid timelines.

Stopping hormones before surgery is often required, typically two to four weeks prior, to reduce blood clot risk during and after the procedure. This gap can feel difficult emotionally, and some people experience a temporary return of dysphoria during this time. When I stopped testosterone before my nulloplasty, I noticed myself getting more irritable and fatigued in that second week—nothing catastrophic, but enough that I was glad I'd warned my support people it might happen. Knowing the hormone pause is temporary and planning for it—maybe arranging extra support during those weeks, scheduling lighter responsibilities, being gentle with yourself—helps.

Post-surgical hormone needs depend on what organs remain. If you've had an orchiectomy, your body no longer produces significant testosterone, so you'll need some form of hormone replacement (either estrogen or testosterone, depending on your goals) for long-term health—particularly bone density (Iwamoto et al., 2019). If you've had a hysterectomy and oophorectomy, the same applies: you'll need ongoing hormones unless you want to manage the health effects of having very low hormone levels, which can include bone loss, cardiovascular changes, and cognitive effects over time. Your surgeon and endocrinologist should coordinate on post-surgical hormone management, though in my experience, you may need to facilitate that communication yourself rather than assuming it will happen automatically.

Monitoring and Safety#

HRT requires regular blood work, especially in the first year and after any dose changes. Typical monitoring includes hormone levels (testosterone, estradiol), hematocrit (red blood cell count, which testosterone can increase), liver function, lipid panel, and sometimes prolactin or other markers depending on your regimen (Hembree et al., 2017).

Common side effects on testosterone include acne, increased body odor, changes in mood or energy, and potential hair thinning or loss at the temples. The acne surprised me—I'd had clear skin as a teenager and somehow expected that to continue. Instead, I spent my first year on T learning skincare routines I'd never needed before. Hematocrit elevation is a more serious medical concern that requires monitoring—if levels get too high, you may need to adjust your dose or donate blood to bring red blood cell counts down.

Common side effects on estrogen include breast tenderness, mood changes, decreased libido, and potential nausea when starting. Blood clot risk is the most serious concern, particularly with oral estrogen in people over 40, smokers, or those with clotting disorders (T'Sjoen et al., 2019). Transdermal estrogen (patches, gel) appears to carry lower clot risk than oral forms, which is why many providers recommend non-oral routes for higher-risk individuals.

Contraindications—conditions that make HRT risky—include history of blood clots, certain hormone-sensitive cancers, and severe liver or cardiovascular disease. Having risk factors doesn't necessarily mean HRT is impossible, but it means careful evaluation and possibly modified approaches. A provider experienced in transgender care can help weigh risks against benefits for your specific situation.

The goal of monitoring isn't to catch you doing something wrong. It's to ensure your body is handling the hormones well and to adjust your regimen for optimal health and effectiveness. A good provider relationship involves honest communication about how you're feeling, what's working, and what isn't. If something feels off, saying so isn't complaining—it's giving your provider the information they need to help you.

Accessing HRT#

How you access HRT depends on your location, insurance, and the providers available to you.

Informed consent clinics provide HRT based on your stated identity and goals without requiring letters from therapists or extensive psychiatric evaluation. You receive information about risks, benefits, and alternatives; you confirm you understand; and treatment can begin. This model treats you as the expert on your own identity—which you are. Planned Parenthood locations in many areas, many LGBTQ+ health centers, and telehealth services like FOLX, Plume, and QueerDoc operate on informed consent models.

Traditional gatekeeping models require one or more letters from mental health providers before HRT can begin. While this model is becoming less common, some providers and insurance companies still require it. The WPATH Standards of Care have moved away from strict gatekeeping requirements, but not all practitioners have updated their practices accordingly (Coleman et al., 2022). If you're dealing with gatekeeping, having a therapist who understands gender-affirming care and can write letters efficiently helps—though it's reasonable to seek providers who don't require this.

Insurance coverage for HRT varies widely. Many insurance plans now cover hormone therapy for gender dysphoria, but you may need prior authorization, and some plans have exclusions. Generic testosterone and estradiol are relatively inexpensive even without insurance—often $20 to $50 per month depending on form and pharmacy. Brand-name medications and some delivery methods cost more.

DIY HRT—obtaining hormones without a prescription—is a reality for people who face barriers to legitimate care: inability to find knowledgeable providers, insurance exclusions, lack of money for appointments, or living in regions where access is restricted or dangerous. I'm not going to pretend this doesn't happen or that everyone who does it is being reckless. For some people, DIY is the only option that feels accessible or safe, and moralistic finger-wagging doesn't change material circumstances.

If you're considering or currently using non-prescribed hormones, harm reduction matters. Source quality is unpredictable—some online sources sell legitimate medications, others sell contaminated or misdosed products. Getting blood work done (which you can often order yourself through services like Walk-In Lab or Ulta Lab Tests) helps you monitor your levels and catch problems early. Using standard doses rather than assuming more is better reduces risk. Connecting with community resources and online groups where people share information about sourcing and safety can help—though information quality varies, so approach with appropriate skepticism.

The goal should still be getting into legitimate care when possible. Informed consent clinics and telehealth have made this more accessible than ever. But I understand that "when possible" isn't the same as "right now" for everyone, and I'm not interested in shaming people for making the best choices available to them in imperfect circumstances.

Long-Term Considerations#

HRT is often a long-term or lifelong commitment, and understanding what that means helps you plan.

Fertility preservation should be discussed before starting HRT if having biological children matters to you. Testosterone typically stops ovulation; estrogen typically stops sperm production. These effects may or may not be reversible if you stop hormones, and the research on long-term fertility after HRT is limited (Iwamoto et al., 2019). Banking eggs or sperm before starting hormones is the most reliable option if future biological children are important to you. Fertility addresses fertility preservation in detail.

Bone density requires adequate hormone levels. If you're on very low doses or if you've had gonads removed without adequate hormone replacement, you're at risk for osteoporosis over time. This is manageable with proper monitoring—regular DEXA scans to assess bone density—and ensuring your hormone levels stay in a healthy range. It's one of the reasons post-surgical hormone management matters so much.

Cardiovascular health is a long-term consideration, particularly with testosterone (which can affect cholesterol profiles) and with estrogen (clot risk, particularly with oral forms). Regular monitoring and attention to other cardiovascular risk factors—smoking, diet, exercise, blood pressure—matters for overall health, not just HRT safety.

What happens if you stop depends on what changes have occurred. Some effects reverse if you stop HRT relatively early: fat distribution shifts back, skin texture changes, menstruation returns or spontaneous erections return. Others are permanent: voice deepening on testosterone, breast growth on estrogen, and depending on duration, facial hair growth or male-pattern baldness. Understanding what's reversible helps you make decisions with appropriate weight—recognizing that some choices close doors while others remain open.

Finding the Right Provider#

A good HRT provider is knowledgeable about gender-affirming care, operates from an informed consent framework (or at least doesn't create unnecessary barriers), listens to your goals rather than assuming what you want, and is willing to work with non-standard protocols if that's what you need.

Questions worth asking at a first appointment: How do you approach dosing—do you work with patients to find what feels right, or do you follow strict protocols? What's your experience with nonbinary patients or patients seeking partial effects? How do you handle coordination with surgeons if I'm planning surgery? What does your monitoring schedule look like?

If a provider dismisses your goals, questions your identity, or seems unfamiliar with current standards of care, finding someone else is worth the effort. I've had providers who treated my non-standard path—nullification while continuing testosterone—as confusing or suspect, and providers who engaged with genuine curiosity about what I wanted and why. The difference in quality of care was profound. You deserve a partner in your healthcare, not a gatekeeper who thinks they know your body and your identity better than you do.

Reflection Questions#

1. What role, if any, do you see HRT playing in your path? Are there specific changes you want, or changes you want to avoid? How does thinking about the timeline of changes—months to years rather than immediate—affect how you're approaching decisions?

2. If you're considering HRT alongside surgery, how do those two decisions relate for you? Is HRT preparation for surgery, or are they separate choices? What does the relationship between hormonal and surgical goals look like in your particular situation?

3. What barriers, if any, do you face in accessing HRT? What resources—informed consent clinics, telehealth, community support—might help you navigate those barriers?

4. Who in your life could support you through the gradual changes of HRT? What would that support look like in practice?

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References#

Coleman, E., Radix, A. E., Bouman, W. P., Brown, G. R., de Vries, A. L. C., Deutsch, M. B., Ettner, R., Fraser, L., Goodman, M., & Arcelus, J. (2022). Standards of care for the health of transgender and gender diverse people, version 8. International Journal of Transgender Health, 23(Suppl 1), S1–S259. https://doi.org/10.1080/26895269.2022.2100644

Hembree, W. C., Cohen-Kettenis, P. T., Gooren, L., Hannema, S. E., Meyer, W. J., Murad, M. H., Rosenthal, S. M., Safer, J. D., Tangpricha, V., & T'Sjoen, G. G. (2017). Endocrine treatment of gender-dysphoric/gender-incongruent persons: An Endocrine Society clinical practice guideline. The Journal of Clinical Endocrinology & Metabolism, 102(11), 3869–3903. https://doi.org/10.1210/jc.2017-01658

Iwamoto, S. J., Defreyne, J., Rothman, M. S., Van Schuylenbergh, J., Van de Bruaene, L., Motmans, J., & T'Sjoen, G. (2019). Health considerations for transgender individuals. Reviews in Endocrine and Metabolic Disorders, 20(4), 387–408. https://doi.org/10.1007/s11154-019-09512-8

T'Sjoen, G., Arcelus, J., Gooren, L., Klink, D. T., & Tangpricha, V. (2019). Endocrinology of transgender medicine. Endocrine Reviews, 40(1), 97–117. https://doi.org/10.1210/er.2018-00011

UCSF Transgender Care. (2016). Guidelines for the primary and gender-affirming care of transgender and gender nonbinary people (2nd ed.). https://transcare.ucsf.edu/guidelines

Unger, C. A. (2016). Hormone therapy for transgender patients. Translational Andrology and Urology, 5(6), 877–884. https://doi.org/10.21037/tau.2016.09.04

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A Comprehensive Resource on Adult Hormone Replacement Therapy#

Last updated July 30, 2025

Introduction#

Hormone replacement therapy (HRT) refers to medical treatments that supplement or replace naturally occurring hormones in the body. These therapies address hormonal deficiencies and help align physical characteristics with gender identity. Hormone administration can cause significant physiological changes, making individualized treatment plans essential under the guidance of experienced healthcare professionals. This comprehensive guide serves as an in-depth resource on adult HRT, focusing specifically on transgender and nonbinary individuals—as well as intersex individuals with diverse hormonal needs.

Testosterone Hormone Replacement Therapy#

Testosterone, a primary androgen, plays a crucial role in the development and maintenance of masculine characteristics. For individuals seeking masculinization, various formulations and delivery methods of testosterone are available through hormone replacement therapy.

Detailed Overview of Testosterone Formulations and Delivery Methods#

Injectable Testosterone

Several esterified forms of testosterone are available for injection, each with a different pharmacokinetic profile influencing the frequency of administration.

• Testosterone Enanthate: This formulation is typically administered via deep intramuscular injection into the buttock muscle every 2 to 4 weeks by a healthcare professional, though self-administration may be possible in some cases. The injection should be performed slowly and deeply, avoiding veins. Healthcare providers should observe patients for at least 30 minutes following injection to monitor for adverse reactions.Dosage varies significantly (50-400 mg) and is carefully adjusted based on factors such as age, individual response, and side effects. For binary transgender men (FTM), starting doses typically range between 50-80 mg every two weeks or 25-40 mg weekly, with maintenance dosages often between 100-200 mg every two weeks or 50-100 mg weekly. Nonbinary individuals may prefer lower doses (around 25 mg weekly) for more gradual masculinizing effects.Dosage adjustments should be guided by symptomatic response and regular monitoring of testosterone levels, targeting the mid-normal male physiological range (approximately 500-700 ng/dL when measured by mass spectrometry). Intramuscular injection provides very high bioavailability (approaching 95%). Following injection, serum testosterone levels typically peak within 36-48 hours and gradually decline, becoming subtherapeutic after approximately 3-4 weeks.Testosterone enanthate helps treat low testosterone levels and delayed puberty, improving muscle mass, strength, energy levels, libido, voice deepening, and facial/body hair growth. It can enhance psychological well-being, reduce gender dysphoria, and reverse hypogonadism effects.Potential risks include acne, injection site pain/swelling, blood clots, stroke, heart attack, liver problems, high blood pressure, sleep apnea, high calcium levels, mood changes, anxiety, depression, decreased sperm count, and breast enlargement/tenderness. Misuse can lead to addiction, heart failure, and hallucinations. Severe allergic reactions are possible, particularly with sesame oil-containing formulations. Testosterone enanthate can interact with diabetes medications, blood thinners, and corticosteroids. Long-term use may cause liver problems, necessitating regular liver enzyme monitoring. Other risks include fluid retention, swelling, and increased prostate cancer risk, especially in older males.
• Testosterone Cypionate: Similar to testosterone enanthate, testosterone cypionate is administered via intramuscular injection, typically every 1 to 4 weeks. Self-administration is often possible with proper training. Dosage generally ranges between 50-400 mg, with healthcare providers making adjustments based on individual needs. For transgender men, starting doses are similar to those of enanthate. Treatment aims for testosterone levels of 450-600 ng/dL. Intramuscular injection provides very high bioavailability, with levels peaking for 4-5 days after injection before gradually declining to subtherapeutic levels by day 14. Subcutaneous delivery is also effective, often with a 10-15% lower initial dose when transitioning from intramuscular administration. Benefits include treating low testosterone, inducing male puberty, facilitating masculinization for transgender individuals, providing more consistent hormone levels, and alleviating symptoms like fatigue, low libido, reduced muscle mass, cognitive difficulties, and mood fluctuations. Potential risks include acne, injection site reactions, cardiovascular issues, blood clots, liver problems, mood changes, sleep apnea, prostate concerns, and fertility issues. It may interact with diabetes medications and blood thinners, and long-term high-dose use might increase risks of liver problems, blood clots, fluid retention, and prostate cancer, particularly in older individuals.
• Testosterone Propionate: This formulation requires more frequent administration due to its shorter half-life, typically via intramuscular injection every 2 to 3 days. Dosage is tailored to the individual's condition and testosterone levels. Implantable pellets offer an alternative delivery method—six 75 mg pellets provide the equivalent of weekly 75 mg injections and last approximately three months. Intramuscular injection results in very high bioavailability with a relatively short elimination half-life of approximately 20 hours. Benefits include treating low testosterone, improving energy, mood, and libido, and increasing muscle mass, strength, and bone density. It's primarily used for androgen replacement therapy and conditions such as hypogonadism, breast cancer, low sexual desire, and delayed puberty. As a natural and bioidentical form of testosterone, it rapidly converts to the active hormone. A notable risk is injection site pain due to its short ester chain. Other side effects include masculinization symptoms (acne, increased hair growth, voice changes, increased sexual desire), potential aggressive behavior, cardiovascular concerns, liver problems, fertility issues, and injection site reactions.
• Testosterone Undecanoate: This longer-acting injectable testosterone is typically administered intramuscularly every 10-12 weeks following an initial loading phase. It's also available as oral capsules taken with food twice daily. Injectable dosing often begins with 750 mg, followed by another 750 mg after 4 weeks, then 750 mg every 10 weeks. For transgender men, typical oral dosage is 160-240 mg daily. Oral bioavailability is relatively low (3-7%) and food-dependent, while intramuscular injection provides sustained testosterone release, with levels peaking around day 7 and declining to subtherapeutic levels by week 10 after initial doses. The injectable form offers the least frequent dosing among intramuscular options, while the oral form provides a convenient injection alternative. Both effectively replace testosterone. A significant risk with injectable undecanoate is pulmonary oil microembolism and anaphylaxis, requiring at least 30 minutes of monitoring after each injection. Oral formulations may increase blood pressure and carry boxed warnings for cardiovascular events. Additional risks include decreased T4 levels and reduced sperm concentration. However, newer oral formulations haven't shown significant liver toxicity in clinical trials.

Topical Gels and Solutions

Testosterone can also be administered through topical gels and solutions, offering a needle-free alternative.

• Administration: These formulations are typically applied once daily to clean, dry, and intact skin on areas such as the shoulders, upper arms, abdomen, thighs, or underarms, and should be allowed to dry completely before dressing. It is important to wash hands thoroughly after application and to avoid skin contact with others until the gel or solution has dried to prevent unintended testosterone exposure.
• Dosage: The dosage varies depending on the specific product, such as AndroGel, Testim, Fortesta, Vogelxo, and Axiron, as well as the concentration, which is typically 1% or 1.62%. Starting doses generally range from 25 mg to 50 mg of testosterone per day and are adjusted by a healthcare professional based on individual needs. Lower doses, in the range of 12.5 to 25 mg per day for 1% gel and around 20.25 mg per day for 1.62% gel, are often used for microdosing in nonbinary individuals seeking more subtle changes.
• Absorption Rates: The bioavailability of topical testosterone gels and solutions typically ranges from approximately 8% to 14%, and can be influenced by the specific application site. Absorption may be lower when applied to the abdomen compared to other areas like the upper arms or shoulders. For AndroGel, serum testosterone levels typically peak between 16 and 22 hours after application.
• Potential Benefits: Topical formulations offer the advantage of avoiding injections and generally provide more stable daily hormone levels compared to the peaks and troughs associated with injectable testosterone. They are also considered easy to use and may induce more gradual physical changes, which can be preferable for some individuals.
• Potential Risks: A significant risk associated with topical testosterone is the potential for transfer to other individuals, particularly women and children, through direct skin contact with the application site, especially if the area is unwashed or uncovered. This unintended exposure can lead to virilization in these individuals. Skin irritation at the application site is a common side effect. Other potential risks are similar to those associated with other testosterone formulations and include heart attack, stroke, blood clots, prostate problems, liver issues, mood changes, sleep apnea, and high calcium levels. Topical testosterone may also lower sperm count.

Patches

Transdermal patches provide another convenient method for testosterone delivery.

• Administration: Testosterone patches are typically applied once daily to clean, dry skin on areas such as the back, abdomen, upper arms, or thighs. To minimize skin irritation, it's important to rotate application sites regularly. Patches should not be applied to the scrotum or bony areas of the body.
• Dosage: These patches are available in various strengths, including 2 mg, 4 mg, 2.5 mg/day, and 5 mg/day. For binary FTM individuals, typical doses range from 2.5 mg to 10 mg of testosterone per day. Lower doses of 1 to 2 mg per day may be used for microdosing in nonbinary individuals.
• Absorption Rates: The bioavailability of testosterone from transdermal patches is estimated between 9% and 14%. Patches release the hormone gradually, providing consistent, low-dose testosterone throughout the day. Serum testosterone levels typically peak around 8.2 hours after application.
• Potential Benefits: Testosterone patches are non-invasive and easy to use, offering steady hormone release. When applied at night, they can mimic the body's natural circadian rhythm of testosterone production.
• Potential Risks: Skin irritation at the application site is a common complaint among users. For individuals with severely low testosterone levels, patches may not provide as high a dose as injections, potentially leading to less effective symptom management. Other potential risks include increased red blood cell count, heart attack, stroke, blood clots, prostate cancer, liver problems, sleep apnea, and high calcium levels. Testosterone patches can also interact with diabetes medications and blood thinners. Physical activities involving excessive sweating or water exposure may cause patches to loosen or detach.

Buccal Tablets

Buccal tablets provide a convenient non-injectable testosterone administration option.

• Administration: Applied to the upper gums twice daily (every 12 hours), these tablets dissolve slowly in the buccal mucosa. They should never be chewed or swallowed.
• Dosage: Standard adult hormone replacement dosing is 30 mg twice daily.
• Absorption Rates: Buccal tablets offer higher bioavailability than oral formulations but lower than injections or transdermal methods (approximately 14.1% in animal studies). Serum testosterone levels peak within 10-12 hours after application and decline 2-4 hours after tablet removal.
• Potential Benefits: These tablets provide higher bioavailability than oral testosterone and are easy to self-administer with potentially quick reversal of effects if needed. The twice-daily dosing can effectively mimic the body's natural circadian testosterone rhythm.
• Potential Risks: Common side effects include gum/mouth irritation, abnormal/bitter taste, gum pain/tenderness/swelling, headache, acne, and breast pain/enlargement. Additional risks mirror other testosterone formulations: blood clots, cardiovascular events, prostate cancer, liver problems, sleep apnea, elevated calcium levels, and decreased sperm count. Buccal testosterone may interact with medications such as cyclosporine and lonafarnib.

Testosterone HRT for Nonbinary Transgender and Gender Non-Conforming AMAB Masc-Presenting Individuals#

For nonbinary individuals assigned male at birth who present masculinely and seek testosterone HRT, the goals and considerations often differ from those of binary transgender men.

• Specific Goals and Considerations: Nonbinary individuals may desire a spectrum of masculinizing effects, often seeking changes that are more subtle or gradual compared to the typical goals of binary transgender men. Their objectives might involve achieving specific changes, such as a deepening of the voice, a redistribution of body fat towards a more masculine pattern, and some degree of increased hair growth, without necessarily pursuing the full range of masculinizing effects typically sought by binary transgender men. A common approach for nonbinary individuals is microdosing, which involves using lower doses of testosterone to induce more subtle and gradual physical changes. Examples of microdosing regimens include injectable testosterone around 20 mg per week, 1% testosterone gel at a dosage of 12.5 to 25 mg per day, 1.62% testosterone gel around 20.25 mg per day, testosterone cream around 10 mg per day, and testosterone patches at a dosage of 1 to 2 mg per day. The dosage of testosterone is typically individualized and carefully titrated based on the specific desired effects and through regular monitoring of hormone levels. It is also important for nonbinary individuals to consider both the reversible and irreversible changes associated with testosterone HRT when making decisions about their treatment. Some nonbinary individuals may even choose to use testosterone blockers alone to achieve a minimal degree of feminization. Furthermore, the theoretical use of Selective Estrogen Receptor Modulators (SERMs) is being explored as a potential treatment option for nonbinary AMAB individuals who desire partial feminization without undergoing breast development.
• Impact on Gender Dysphoria: Testosterone HRT can play a significant role in alleviating gender dysphoria for nonbinary individuals by facilitating the alignment of their physical characteristics with their gender identity. Even the more subtle masculinizing changes achieved through lower-dose testosterone regimens can lead to significant improvements in mental health and overall well-being for this population. Many nonbinary individuals report experiencing an increased sense of energy and confidence, as well as a greater feeling of ease and comfort in their own bodies, upon initiating testosterone HRT. It is also important to note that testosterone can influence the range and intensity of emotions experienced, and these effects can vary from person to person.
• Considerations for Gender-Affirming Bottom Surgery (Pre- and Post-Operative): The role of testosterone HRT in the context of gender-affirming bottom surgery for nonbinary AMAB individuals involves specific considerations for both the pre-operative and post-operative phases.
• Pre-operative: Some medical centers do not require testosterone HRT before gender-affirming bottom surgery, making these procedures more accessible to individuals of all gender identities. However, procedures like metoidioplasty, which depend on erectile tissue growth, may benefit from 1-2 years of testosterone HRT to maximize bottom growth. For phalloplasty, hormone therapy isn't strictly necessary but may be desired for other masculinizing effects. Nonbinary individuals should have thorough discussions with both surgeons and hormone providers to create personalized treatment plans aligned with their specific goals. Generally, estrogen HRT should be discontinued approximately 2 weeks before surgery to reduce blood clot risk. Guidelines for testosterone cessation vary, with some evidence suggesting it may be safely continued for certain procedures like chest surgery.
• Post-operative: After most gender-affirming bottom surgeries, hormone therapy can typically resume about one week post-procedure, though following the surgeon's specific instructions is essential. Hormone dosages may require adjustment, especially if gonads (testicles or ovaries) are removed during surgery. Gonadectomy typically necessitates lifelong hormone therapy to maintain bone health and desired physical characteristics. For those considering testosterone after top surgery (masculinizing chest surgery), starting is generally safe and won't negatively impact surgical results. However, waiting 3-4 weeks post-surgery allows for initial healing, and consulting with the plastic surgeon is advisable. Bottom surgery procedures like orchiectomy significantly affect endogenous hormone levels, requiring careful HRT regimen adjustments to maintain appropriate hormone balance.

Testosterone HRT for Binary Transgender Men (FTM)#

For binary transgender men, the goals of testosterone HRT typically focus on achieving complete and sustained masculinization.

• Typical Goals of HRT: The primary aim is to increase testosterone levels to within the normal male physiological range (300-1000 ng/dL). This facilitates development of male secondary sex characteristics, including deepened voice, facial and body hair growth, increased muscle mass and strength, masculine fat redistribution (more around waist, less around hips), cessation of menstruation, and clitoral enlargement. Testosterone HRT also suppresses female secondary sex characteristics. Ultimately, this alleviates gender dysphoria and improves psychological well-being by aligning physical presentation with gender identity.
• Common Starting and Maintenance Dosages: Testosterone formulation and dosage choices are highly individualized. Injectable testosterone (enanthate or cypionate) is common and cost-effective, with typical starting doses of 50-80 mg biweekly or 25-40 mg weekly. Maintenance dosages often range from 100-200 mg biweekly or 50-100 mg weekly. Subcutaneous administration is also effective, with potential initial dose reduction when switching from intramuscular injections. Testosterone gel offers another popular option, with typical starting doses of 2.5-5 g (25-50 mg testosterone) applied daily, potentially reaching maximum doses of 5-10 g (50-100 mg testosterone) daily. Testosterone patches are available with starting doses typically between 2.5-5 mg daily and maximum doses of 5-10 mg daily. Oral testosterone undecanoate provides another option at typical dosages of 160-240 mg daily. Healthcare professionals determine and adjust specific dosages based on serum testosterone levels and clinical response.
• Expected Timelines for Physical Changes: Physical changes following testosterone HRT initiation vary among individuals due to genetics, age, and dosage. Generally, within the first 1-3 months, individuals experience increased sex drive, vaginal dryness, clitoral growth (typically 1-3 cm), fine body and facial hair growth, oilier skin, increased acne, increased muscle mass and upper body strength, and masculine fat redistribution. Between 1-6 months, menstrual periods often cease, and voices begin to deepen, with more noticeable voice pitch drops occurring within 3-6 months. Between 6-12 months, coarser facial and body hair growth increases, possible male-pattern balding begins, muscle mass and strength significantly increase, and voice deepening continues. Voice deepening and clitoral growth typically reach maximum effect within 1-2 years. Maximum body fat redistribution and muscle mass/strength increases usually occur within 2-5 years. Full facial and body hair development may take 3-5 years, with some individuals experiencing gradual facial hair growth for a year or more, potentially requiring 1-4 years to reach full growth.
• Potential Long-Term Health Considerations: Long-term testosterone HRT carries several health implications requiring ongoing monitoring. Users may experience increased risk of polycythemia (elevated red blood cell count), weight gain, acne, balding, and sleep apnea. Testosterone can affect cardiovascular health through changes in cholesterol levels, blood pressure, blood sugar, and weight. It may potentially exacerbate certain pre-existing mental health concerns. While testosterone therapy reduces fertility, it doesn't eliminate pregnancy possibility, so contraception remains important if pregnancy isn't desired. Long-term use may increase risk of heart attack, stroke, blood clots, liver problems, high blood pressure, sleep apnea, mood changes, hair loss, gallstones, elevated liver enzymes, and dyslipidemia (abnormal lipid levels). Regular monitoring of testosterone levels, hematocrit, lipid profile, and potentially prostate-specific antigen (PSA) helps manage these potential risks. Bone health monitoring is crucial, particularly with long-term testosterone use or after surgical removal of the ovaries (oophorectomy). Individuals retaining their cervix and breasts should continue cervical and breast cancer screening according to established guidelines. Encouragingly, recent long-term studies suggest testosterone therapy is generally safe, with some research showing favorable outcomes in body composition without significant dose-dependent long-term side effects such as polycythemia or dyslipidemia. Additionally, physical performance in nonathletic transgender men may improve to levels comparable to cisgender men within a few years of starting testosterone therapy.
• WPATH Guidelines for Testosterone HRT: The World Professional Association for Transgender Health (WPATH) provides comprehensive Standards of Care (SOC) as evidence-based guidelines for transgender and gender-diverse healthcare. These guidelines recommend that individuals seeking hormone therapy, including testosterone HRT, meet specific criteria: persistent, well-documented gender dysphoria; capacity to make fully informed decisions and consent to treatment; and being of legal age in their country. According to these guidelines, testosterone HRT aims to suppress endogenous sex hormone production and maintain sex hormone levels within the normal physiological range for the affirmed gender. Regular monitoring of hormone levels, hematocrit, and lipid profiles is recommended for ongoing care. Referral for gender-affirming surgeries, including bottom surgery, typically requires agreement between the individual's mental health professional and hormone-prescribing clinician, along with evidence of satisfactory social role change, satisfaction with hormone therapy effects, and clear desire for definitive surgical changes. WPATH guidelines typically recommend at least 12 months of consistent hormone therapy before consideration for genital gender-affirming surgeries, unless specific medical contraindications exist or documented reasons show why hormone therapy isn't part of their transition journey.

Feminizing Hormone Therapy for Individuals Assigned Male at Birth (AMAB)#

For individuals assigned male at birth who seek to align their physical characteristics with a feminine gender identity, feminizing hormone therapy typically involves the use of estrogen, often in combination with anti-androgens and sometimes progesterone.

Estrogen Therapy: Options and Considerations#

Estrogen is the primary hormone used to induce feminizing changes in the body. Various formulations are available, each with its own administration route, pharmacokinetic profile, and potential benefits and risks.

• Estradiol Pills: Estradiol, a primary form of estrogen, is commonly administered orally or sublingually (under the tongue). The typical dosage ranges from 2 to 8 mg per day, with higher doses often divided into twice-daily administrations. Lower doses around 1 mg daily may be used for microdosing purposes. Healthcare providers typically titrate the dosage gradually, often by 2 mg every 3 months, to achieve desired effects. A range of dosages, from ultra-low to standard, is available to suit individual needs.The effects of estradiol include breast development, redistribution of body fat towards a more feminine pattern (hips and thighs), skin softening, decreased muscle mass and strength, reduced body and facial hair growth, decreased libido, fewer spontaneous erections, decreased sperm production, and reduced testicular size. Many individuals also report mood improvements and reduced anxiety after starting estradiol.Common side effects may include nausea, vomiting, headaches, mood changes, breast tenderness, weight gain, bloating, leg cramps, mild skin rash or itching, diarrhea, and hair loss. Less common but more serious side effects can include abnormal liver function, gallstones, increased blood pressure, elevated blood triglycerides, increased risk of blood clots, stroke, heart problems, potential increased breast cancer risk compared to cisgender men, elevated prolactin levels, nipple discharge, and potential infertility.Sublingual administration, where the pill dissolves under the tongue, may provide higher bioavailability and more stable hormone levels. Oral estradiol may carry a higher thromboembolism risk, particularly in individuals older than 40 years. It is generally not recommended for those with a personal or strong family history of blood clots. Estrogen use may also interfere with folate absorption.
• Estradiol Patches: Transdermal estradiol patches are typically applied two to three times per week to clean, dry skin, with rotation of application sites. The starting dose is often 0.1 mg applied twice weekly, with gradual increases by 0.1 mg every 3 months, up to a maximum of 0.4 mg twice weekly. Lower-dose options around 50 mcg per day are available for microdosing. Effects are generally similar to oral estradiol. A key advantage of patches is their potentially lower risk of blood clots compared to oral estrogen. Side effects can include skin irritation at the application site, breast tenderness, headaches, nausea, bloating, mood changes, hair loss, increased blood pressure, and in rare cases, blood clots, stroke, heart attack, liver injury, and gallbladder problems. Patches may be preferred for individuals with risk factors for blood clots.
• Estradiol Injections: Intramuscular estradiol injections (valerate or cypionate) are typically administered every 1-2 weeks. Dosages commonly range from 2-10 mg weekly or 5-30 mg biweekly, with microdosing options below 10 mg weekly. Dosages are highly individualized based on personal needs and hormone levels. Starting with lower doses helps avoid excessive serum levels and may reduce side effects. A major advantage of injections is bypassing first-pass liver metabolism. Side effects may include breast tenderness, digestive issues, weight fluctuations, dizziness, mood changes, libido changes, hair pattern alterations, skin changes, and rarely, serious complications like blood clots, stroke, or liver problems. Injection site reactions can also occur. Careful dosage management is essential to prevent supratherapeutic levels.
• Estradiol Gels and Creams: Topical estradiol formulations are applied daily to clean, dry skin. The gel should be spread thinly and allowed to dry completely before dressing. Dosages vary by product and concentration. Examples include AndroGel (1%: 50-100 mg daily; 1.62%: 40.5-81 mg daily), Fortesta (40-70 mg daily), Vogelxo (50-100 mg daily), and Axiron 2% (60 mg daily to underarms). Effects mirror other estrogen formulations. Common side effects include application site irritation, breast tenderness, nausea, stomach discomfort, and rarely, serious complications similar to other estrogen forms. Users should be aware of potential transfer to others through skin contact. Topical application generally results in lower systemic exposure compared to oral administration.

Anti-Androgen Therapy: Options and Considerations#

Anti-androgens are often used in conjunction with estrogen therapy to suppress the effects of testosterone in individuals undergoing feminizing HRT.

• Spironolactone: This oral medication is commonly used as an anti-androgen, typically at a dosage of 50 to 200 mg twice daily, with a maximum potential dose of 400 mg per day. Microdosing at around 25 mg per day is also possible for some individuals. It is generally recommended to take spironolactone with meals and to start with a low dose, titrating slowly to allow the body to adjust to its diuretic effects. The dosage is individualized based on the level of testosterone suppression needed and the occurrence of any side effects. Spironolactone works by lowering testosterone levels in the body and blocking testosterone from binding to its receptors. This can lead to a slowing of facial and body hair growth, a decrease in androgenic alopecia (male-pattern baldness), a reduction in the volume of the prostate and testicles, and, in some cases, breast growth. Common side effects include increased urination, increased thirst, reduced blood pressure, fatigue, dehydration, and the potential for elevated potassium levels in the blood (hyperkalemia), particularly in individuals with kidney problems or those taking certain medications like ACE inhibitors or ARBs. Other potential side effects include gastrointestinal issues, skin rash, and drowsiness. Spironolactone is the most frequently used anti-androgen in the United States. Regular blood tests are necessary to monitor potassium levels while taking this medication. Spironolactone is contraindicated in individuals with severe renal insufficiency.
• Cyproterone Acetate: This potent anti-androgen is typically administered orally at a dosage of 10 to 100 mg per day. Lower doses, such as 10 mg daily, have been shown to be equally effective in lowering testosterone levels in transgender women while potentially causing fewer side effects. Dosages in the range of 10 to 25 mg daily may be sufficient for testosterone suppression in many individuals. Cyproterone acetate works by competitively inhibiting the androgen receptor and exerting negative feedback on the hypothalamus, thus suppressing testosterone production and blocking its action. It also has progestogenic effects. The effects include a reduction in facial and body hair growth, a decrease in androgenic alopecia, a reduction in prostate and testicular volume, and breast growth. Some studies suggest it may be more effective than spironolactone in suppressing testosterone levels. Potential side effects include elevated liver enzyme levels, hepatotoxicity (which can be rare but serious), depression, fatigue, weight gain, low sex hormone levels, reversible infertility, sexual dysfunction, a possible increased risk of venous thromboembolism (VTE), changes in blood cell counts, elevated prolactin levels (prolactinemia), a possible increased risk of prolactinoma (a pituitary tumor), and the potential for brain tumors, particularly meningioma, with the risk increasing with higher doses and prolonged use. Cyproterone acetate is not widely available in the United States. Due to the potential for serious side effects, it is generally recommended to use the lowest effective dose. It is contraindicated in individuals with active liver disease, severe renal insufficiency, severe chronic depression, a history of liver tumors, meningioma, or an existing thromboembolic process.
• GnRH Agonists (Gonadotropin-Releasing Hormone Agonists): These medications are typically administered via subcutaneous injection or implant, usually on a monthly or every-three-month basis. The dosage varies depending on the specific agonist used, such as leuprolide, which is often given at a dose of 3.75 mg monthly. GnRH agonists work by suppressing the entire pituitary-gonadal axis, leading to very low levels of both testosterone and estradiol. In adolescents, they are commonly used to prevent the progression of puberty. In adults, they can be used to effectively suppress testosterone production as part of feminizing HRT. Some studies suggest that GnRH agonists may be more effective than spironolactone at suppressing testosterone levels. Potential side effects include hot flashes, headaches, mood changes, fatigue, insomnia, muscle aches, and the potential for long-term effects on bone density and fertility, as well as injection site reactions. GnRH agonists are generally more expensive compared to other anti-androgens. They are frequently used in adolescents experiencing gender dysphoria to suppress puberty and may also be used in adults when other anti-androgen options are contraindicated or not well-tolerated.

Progesterone: Role and Considerations#

Progesterone is sometimes used as part of feminizing hormone therapy, although its role and benefits are not as well-established as those of estrogen and anti-androgens.

• Administration: Progesterone is typically administered orally in capsule form, such as micronized progesterone (e.g., Prometrium), often at a dosage of 100 to 200 mg daily, usually taken at night [6]. It can also be administered rectally or vaginally, which may result in higher bloodstream levels by bypassing first-pass liver metabolism [136].
• Dosage: The common dosage is 100 to 200 mg daily, but this can vary depending on the individual's needs and the prescribing healthcare professional's recommendations [6].
• Effects: There are anecdotal reports from transgender women and healthcare providers suggesting that progesterone may improve breast and/or areolar development, mood, and libido [136]. It may also have a role in reducing testosterone production [136]. However, the role of progesterone in feminizing HRT is not as clearly defined by scientific research compared to estrogen and anti-androgens [136].
• Side Effects: Potential side effects of progesterone include mood symptoms and a possible increased risk for liver disease and breast cancer, although bioidentical (micronized) progesterone is thought to carry fewer risks than synthetic progestins [111].
• Considerations: Due to the lack of clear benefit and potential risks, progesterone is not routinely recommended as part of a standard feminizing hormone regimen [124]. If used, micronized (bioidentical) progesterone is generally preferred over synthetic progestins, which have been associated with increased risks of strokes, heart problems, and blood clots [136]. The optimal timing of progesterone initiation in relation to breast development is also a consideration, with some suggesting it may be more beneficial in later stages (Tanner stages 4-5) [136].

Hormone Replacement Therapy for Intersex Individuals#

Intersex individuals are born with sex characteristics that do not fit typical binary definitions of male or female. This population has diverse hormonal needs and considerations that require a highly individualized approach to hormone replacement therapy.

Understanding the Diversity of Intersex Variations and Hormonal Profiles#

Intersex is an umbrella term encompassing a wide range of natural variations in sex characteristics, including differences in chromosomes, gonads, anatomy, and hormone production. It is estimated that intersex variations occur in approximately 1-2% of births. There are more than 30 recognized intersex variations, each with its own potential impact on an individual's chromosomal makeup, hormonal balance, and genital appearance. These variations can arise due to differences in an individual's genes, how their body responds to sex hormones, or a combination of both factors. In some cases, environmental factors such as exposure to endocrine-disrupting chemicals during fetal development may also play a role.

The hormonal profiles of intersex individuals are incredibly diverse and depend on the specific intersex variation. For instance, individuals with 46,XX intersex, who have female chromosomes and ovaries but external genitalia that appear male (often due to congenital adrenal hyperplasia or CAH), may have high levels of androgens like testosterone. In contrast, individuals with 46,XY intersex, who have male chromosomes but external genitalia that are incompletely formed, ambiguous, or female (as seen in Androgen Insensitivity Syndrome or AIS, and 5-alpha reductase deficiency), can have varying hormonal profiles. AIS involves a spectrum of insensitivity to androgens, leading to different degrees of masculinization, while 5-alpha reductase deficiency affects the conversion of testosterone to the more potent dihydrotestosterone (DHT), impacting external genitalia development.

Sex chromosome intersex variations, such as Klinefelter syndrome (XXY) and Turner syndrome (XO), can also lead to altered hormone levels and sexual development. For example, individuals with Klinefelter syndrome may have lower levels of testosterone. Ovotesticular DSD, a condition where an individual has both ovarian and testicular tissue, presents with complex and varied hormonal patterns.

It is crucial to understand that intersex variation is distinct from gender identity and sexual orientation. Intersex individuals may identify as male, female, both, neither, or any other gender, and their sexual orientation can be heterosexual, homosexual, bisexual, asexual, or any other orientation.

Tailoring HRT to Meet the Specific Needs of Intersex Adults#

Hormone replacement therapy for intersex adults requires a highly personalized approach that considers their specific intersex variation, underlying hormonal profile, self-identified gender identity, and other medical needs. In some cases, HRT is life-saving, such as for individuals with salt-wasting congenital adrenal hyperplasia, where hormone replacement is essential for survival.

HRT commonly treats hypogonadism—reduced functional activity of the gonads and insufficient sex hormone production—which occurs frequently in many intersex variations. For those with delayed or incomplete puberty, hormone therapy can induce typical pubertal changes aligned with their gender identity.

In adulthood, HRT often maintains secondary sexual characteristics aligned with an individual's gender identity while preventing potential metabolic, cardiovascular, and bone health issues that can arise from hormone deficiencies. For intersex individuals who identify as female, estrogen therapy (oral or transdermal) achieves and maintains female secondary sexual characteristics. Those with a uterus typically receive estrogen combined with progestogens to protect the uterine lining.

For those who identify as male, testosterone therapy—available as injections, transdermal patches, gels, or oral formulations—induces and maintains male secondary sexual characteristics. In specific cases, such as individuals with micropenis due to certain intersex variations, dihydrotestosterone-based gels may increase penile length while potentially avoiding gynecomastia (breast development).

Hormone dosages for intersex individuals are carefully titrated, especially during puberty induction, to ensure appropriate physical development and healthy height progression. Transdermal estrogen is often preferred for puberty induction as it's better tolerated with less impact on liver function compared to oral formulations.

For transgender intersex individuals, gender-affirming hormone therapy follows similar principles as for non-intersex transgender individuals, but regimens are always tailored to the individual's unique hormonal background and transition goals.

HRT in the Context of Gender Identity and Potential Surgical Interventions#

Providing hormone replacement therapy to intersex individuals requires careful counseling and a process of informed consent that respects their unique circumstances, age, and self-identified gender identity. Decisions regarding HRT and any potential surgical interventions should ideally involve the active participation of the intersex person, particularly as they reach an age where they can understand the implications of these treatments.

Historically, many intersex children underwent surgical procedures in infancy to make their genitalia conform to binary sex stereotypes, often without their consent. This practice is now increasingly recognized as harmful and medically unnecessary in many cases. Delaying non-urgent surgeries allows individuals more time to explore and understand their gender identity, which may differ from the sex assigned at birth.

For many intersex individuals, lifelong hormone replacement therapy may be required, especially if they have undergone surgical removal of their gonads, to maintain overall health and the physical characteristics they desire. Intersex individuals who identify as transgender may also consider gender-affirming surgeries, either feminizing or masculinizing, following guidelines similar to those for non-intersex transgender individuals. However, their specific anatomy and hormonal background will be important factors in planning these surgical interventions.

Providing comprehensive care to intersex individuals necessitates a multidisciplinary team approach involving medical specialists, mental health professionals, and other relevant experts.

Essential Considerations for All Adult HRT#

Regardless of the specific hormone or the individual's identity, there are several essential considerations that apply to all forms of adult hormone replacement therapy.

Monitoring, Drug Interactions, and Contraindications#

• Monitoring Guidelines: Regular follow-up appointments with healthcare providers are crucial during HRT. These visits enable monitoring of physical changes, assessment of hormone levels through blood tests, and early detection of potential side effects. Monitoring frequency is typically higher during the first year of treatment or after dosage changes (every 3 months), then decreases to every 6-12 months once the regimen stabilizes. Standard blood tests include hormone levels (testosterone and estradiol), hematocrit, lipid profile, and liver function. Additional tests such as prolactin levels, potassium, blood sugar, and prostate-specific antigen may be necessary based on specific hormones used and individual medical history.
• Potential Interactions with Other Medications: HRT can interact with numerous medications, affecting their efficacy or increasing side effect risks. Common interacting medications include diabetes treatments, blood thinners (warfarin), corticosteroids, certain epilepsy medications (lamotrigine), some antibiotics, medications for tuberculosis and HIV, and herbal supplements like St. John's Wort. Individuals considering or undergoing HRT should provide their healthcare provider with a comprehensive, current list of all medications, including over-the-counter drugs, supplements, and herbal remedies.
• Contraindications: Several medical conditions contraindicate hormone replacement therapy, including personal or family history of hormone-sensitive cancers (breast, endometrial, prostate), unexplained vaginal bleeding, history of blood clots, severe heart disease, severe liver disease, and pregnancy. Individuals with allergies to specific HRT medication components, such as sesame or castor oil in injectable testosterone formulations, should avoid those products. Extra caution is needed when considering HRT for people with pre-existing conditions like diabetes, high blood pressure, high cholesterol, migraines, sleep apnea, and certain mental health conditions, as HRT may exacerbate these conditions.

The Importance of Individualized Treatment and Expert Medical Guidance#

The cornerstone of safe and effective hormone replacement therapy lies in developing personalized treatment plans tailored to each individual's unique needs and circumstances. This approach requires careful consideration of the person's specific HRT goals, gender identity, complete medical history, lifestyle, and physiological response to treatment. Regular, open communication between patient and healthcare provider is essential, enabling continuous monitoring of progress, prompt management of side effects, and timely adjustments to the treatment plan.

Due to the complexities and potential risks of hormone replacement therapy, individuals should seek care from healthcare professionals with specialized experience in transgender and intersex healthcare. This care team typically includes endocrinologists, specifically trained primary care physicians, and mental health professionals who provide crucial support throughout the process.

Above all, informed consent remains fundamental in all aspects of HRT. Individuals must receive comprehensive information about the risks, benefits, available alternatives, and potential long-term effects of hormone therapy to make fully informed decisions about their care.

Conclusions#

Adult hormone replacement therapy is a complex and highly individualized field that offers significant benefits for transgender and intersex individuals seeking to align their physical characteristics with their gender identity or address hormonal deficiencies. The availability of various formulations and delivery methods for both testosterone and estrogen allows for tailored treatment plans that can meet a wide range of needs and preferences. However, HRT is not without risks, and careful monitoring, awareness of potential drug interactions, and consideration of contraindications are essential for ensuring patient safety and optimizing outcomes. The importance of seeking care from experienced healthcare professionals who specialize in transgender and intersex health cannot be overstated. These experts can provide the necessary guidance, support, and monitoring to navigate the complexities of HRT and help individuals achieve their transition goals in a safe and affirming manner. The ongoing evolution of medical understanding and clinical guidelines in this field underscores the need for continued research and education to further enhance the quality of care for these diverse populations.

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