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Frequently Asked Questions
What is estradiol valerate?
Estradiol valerate is an ester of 17β-estradiol that is hydrolyzed in vivo to bioidentical estradiol. It is used in both oral menopausal hormone therapy and as a long-acting intramuscular injection.
Outside the US it is a widely prescribed oral estrogen; in the US, injectable estradiol valerate is most commonly used in gender-affirming care.
How does estradiol valerate differ from oral micronized estradiol?
Both deliver 17β-estradiol after metabolism, but estradiol valerate's ester structure produces slightly different absorption kinetics. Clinically, the two are considered therapeutically equivalent at appropriate doses.
Injectable estradiol valerate provides sustained serum levels for 5–10 days per dose, useful when oral or transdermal options are unsuitable.
Is estradiol valerate FDA-approved?
Injectable estradiol valerate (Delestrogen) is FDA-approved for moderate-to-severe vasomotor symptoms, vulvovaginal atrophy, female hypoestrogenism, and palliative treatment of certain cancers. Oral estradiol valerate combination products are FDA-approved for contraception (Natazia).
Do I need progesterone with estradiol valerate?
Yes, if you have a uterus and are using systemic estrogen for menopause. Unopposed estrogen at therapeutic doses substantially raises endometrial cancer risk.
What are the main risks?
Like other oral estrogens, oral estradiol valerate carries an increased risk of VTE and stroke relative to transdermal delivery. Injectable forms may avoid first-pass hepatic effects, but high peak levels can drive breast tenderness and mood swings if dosing intervals are too long.
How long does estradiol valerate take to work?
Vasomotor symptom relief typically begins within 1–2 weeks of oral therapy or within days of an injection. Maximal effect on hot flashes is usually reached by 8–12 weeks.
Can I get estradiol valerate without a prescription?
No. Estradiol valerate is a prescription medication in all formulations. Self-administered injections require physician oversight, dose titration, and monitoring.
How do I find a doctor who prescribes estradiol valerate?
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