Cyproterone
Cyproterone is an anti-androgen medication used primarily in the treatment of androgen-dependent conditions in both men and women. It works by blocking the action of male sex hormones (androgens) at their receptor sites, reducing the effects of testosterone. This medication is commonly prescribed for severe hirsutism, acne, and as part of combination therapy for prostate cancer, as well as in transgender hormone therapy.
Cyproterone is an anti-androgen drug used to treat conditions caused by excess male hormones, such as hirsutism, acne, and prostate cancer.
Key facts at a glance
- ATC
- G03HA01
- RxNorm
- 3014
- Generic
- Cyproterone
- Class
- atc-g03
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- oral
- Forms
- tablet
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Cyproterone is used to treat androgen-dependent conditions including severe hirsutism (excessive hair growth) and acne in women, advanced prostate cancer in men, male pattern baldness, and as part of hormone therapy for transgender women. It is also used in combination oral contraceptives for women with androgen-related conditions.
Cyproterone works by competitively blocking androgen receptors in target tissues, preventing male hormones like testosterone and dihydrotestosterone (DHT) from exerting their effects. It also exhibits progestational activity that suppresses gonadotropin release, thereby reducing testosterone production.
Cyproterone should not be used during pregnancy due to risk of feminization of male fetuses. Common side effects include fatigue, weight changes, mood alterations, and decreased libido. Regular liver function monitoring is recommended as hepatotoxicity is a potential serious adverse effect. It may increase the risk of venous thromboembolism, particularly when combined with estrogens. Blood donation is prohibited during and for periods after treatment.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy