Trans Women's Hormone Regimens: Oral, Gel or Injectable Estrogen?
Estradiol comes in several forms, each with its own pros and cons. The right regimen depends on your health, blood clot risk, lifestyle and blood results.
Key points
- Transdermal estradiol (gel or patches) carries a lower blood clot risk than tablets, suiting people who are older, smoke or have vascular risk.
- The basic regimen is estradiol plus an anti-androgen; people who have had an orchiectomy or whose testosterone is well controlled may use estradiol alone.
- The doses you hear about from friends aren't your dose. Doses must be adjusted by a doctor based on blood results, and more doesn't mean faster.
"Doctor, which is better: tablets, gel or injections?" I hear this question almost every week. The honest answer is that no single form suits everyone; there's only the form that suits you best right now. This article compares them so you can talk with your doctor with a clear understanding.
The basic principles of trans women's hormone regimens
Feminising hormone regimens have two parts: estradiol (the main medicine) and an anti-androgen (used in some people). Read the overview of the steps first in feminising hormone therapy (MTF).
Typical blood targets under the Endocrine Society guideline are estradiol around 100–200 pg/mL and testosterone below 50 ng/dL, but your doctor will also consider your physical changes and how you feel, not just the numbers.
Comparing the forms of estradiol
| Form | Guideline dose range | Advantages | Cautions |
|---|---|---|---|
| Tablets (estradiol valerate or hemihydrate) | About 2–6 mg/day | Easy to find, convenient, affordable | Pass through the liver first, with more effect on blood clotting; must be taken daily |
| Gel | Dose depends on the product and blood results | Doesn't pass directly through the liver; lower clot risk | Must be applied daily and left to dry; avoid partners or children touching the treated skin |
| Patches | About 0.025–0.2 mg/day (changed according to type) | Fairly steady hormone levels | May irritate skin or come off with sweat; harder to buy in Thailand |
| Intramuscular injection (estradiol valerate or cypionate) | About 2–10 mg every week, or 5–30 mg every 2 weeks | Not needed daily; doesn't pass directly through the liver | Levels peak after injection and fall before the next dose; mood may swing with the cycle |
What you shouldn't use: ethinyl estradiol in contraceptive pills, and conjugated equine estrogens, because they carry a higher clot risk and their levels can't be measured in blood.
Which should you choose?
- If you're just starting, young, a non-smoker and healthy, tablets are often a reasonable start.
- If you're over 40–45, smoke, have migraine with aura, have had a blood clot, or have high blood pressure or cholesterol, doctors usually recommend gel or patches.
- If daily medicine is inconvenient or you often forget pills, injections may suit you, but blood must be drawn at the right point in the cycle (see blood tests before starting gender-affirming hormones).
No form suits everyone. The choice is as assessed by your doctor.
The anti-androgens
| Medicine | Guideline dose range | Strengths | Cautions |
|---|---|---|---|
| Cyproterone acetate | The 2017 guideline states 25–50 mg/day, but newer evidence shows about 10 mg/day suppresses almost as well | Strong suppression of male hormones | Meningioma with high cumulative doses (EMA warning 2020), raised prolactin, liver effects, low mood |
| Spironolactone | About 100–300 mg/day | Long track record, affordable | High potassium, frequent urination, low blood pressure; kidney tests needed |
| GnRH agonists (leuprorelin, triptorelin) | Injection monthly or every 3 months | Switches off production at the source, few side effects | Expensive; injections must be kept on schedule |
Following the EMA warning in 2020, current practice is to use cyproterone acetate at the lowest effective dose and to review the need for it regularly, rather than continuing 50 mg indefinitely as was often advised in the past.
Three common regimen patterns
- Estradiol + an anti-androgen: the standard regimen for people who still have testes.
- Estradiol alone: suitable for people who have had an orchiectomy, or those on transdermal or injectable estradiol whose testosterone has fallen enough. It avoids anti-androgen side effects.
- Adding a DHT blocker, such as finasteride, for some people whose main concern is hair thinning. SOC-8 doesn't recommend it routinely because the evidence is limited (see finasteride).
Common misconceptions
- "Take more and your breasts grow faster." Not true. Doses above target don't speed up changes; they just add risk.
- "Injections are stronger, so they're better." Periodic high peaks aren't better. What matters is an appropriate average level.
- "Birth control pills are estrogen too." They're different. Ethinyl estradiol carries a higher clot risk.
- "Use a high-dose anti-androgen to see clearer results." Over-suppression doesn't add benefit, only side effects.
Myth
- Take more, breasts grow faster
- Injections are stronger, so better
- The contraceptive pill is the same oestrogen
- Start a high dose of blocker first for clear effects
Fact
- Going above target doesn't speed it up; it adds risk
- The right average level matters more
- Ethinylestradiol carries more clot risk
- Over-suppression adds side effects, not results
Signs you need a doctor urgently
Swelling and pain in one leg, chest pain or sudden breathlessness, an unusually severe headache, weakness in an arm or leg, or yellowing of the skin or eyes: go to hospital immediately or call 1669 (Thailand's medical emergency number).
Tailoring your regimen at Dr. Kris Clinic
At Dr. Kris Clinic, I help you choose a form of medicine to fit your health and lifestyle, time your blood tests correctly and adjust the dose to suit you, including helping people who have used high-dose cyproterone for a long time move gradually to a safer regimen. Consultations are available in Surat Thani and online, in English if you prefer. To learn how your body changes over time, read when do changes happen on feminising hormones?, or see the overview in GAHT.
Medicines and services your doctor may consider
- Pre-hormone / pre-TRT blood panel (7 tests)฿2,990Details & order →
- Estradiol tablets (28)฿350Details & order →
- Estradiol gel฿590Details & order →
- Estradiol valerate injection฿990Details & order →
- Androcur 50 mg (10 tabs)฿990Details & order →
- Gale cyproterone 50 mg (10 tabs)฿590Details & order →
- Finasteride 1 mg (30 tabs)฿890Details & order →
Prices are per pack. Every medicine is prescribed only after a doctor's assessment; your doctor will advise whether it suits you. See all medicines & services
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Start hormones safely
Assessment, blood tests and follow-up with a judgement-free doctor, in line with WPATH SOC-8.
Every medicine and service requires a doctor's assessment first.
Frequently asked questions
Can I switch from tablets to gel?
Yes, and it's a good option for people with a clot risk. However, equivalent doses don't convert exactly, so your doctor should adjust the dose and repeat blood tests about 4–12 weeks after switching.
Do estrogen injections really cause mood swings?
Some people notice mood changes that follow the injection cycle, especially near the next dose when hormone levels drop. Adjusting the interval or dose may help.
Why is my doctor recommending a lower dose of cyproterone acetate?
Because the risk of meningioma rises with cumulative dose, and evidence shows that a low dose suppresses male hormones almost as well when combined with estradiol.
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References
- Hembree WC, et al. Endocrine Treatment of Gender-Dysphoric/Gender-Incongruent Persons: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2017;102(11):3869–3903.
- Coleman E, et al. Standards of Care for the Health of Transgender and Gender Diverse People, Version 8. Int J Transgend Health. 2022;23(Suppl 1):S1–S259.
- European Medicines Agency (PRAC). Restrictions in use of cyproterone due to meningioma risk. February 2020.
- Kuijpers SME, Wiepjes CM, Conemans EB, et al. Toward a Lowest Effective Dose of Cyproterone Acetate in Trans Women: Results From the ENIGI Study. J Clin Endocrinol Metab. 2021;106(10):e3936–e3945.
- Deutsch MB, ed. Guidelines for the Primary and Gender-Affirming Care of Transgender and Gender Nonbinary People, 2nd ed. UCSF Transgender Care; 2016.
This article is for education and does not replace diagnosis or treatment by a doctor. If you have symptoms or concerns, please see a doctor.
