About cyproterone acetate
Antiandrogen and progestogen
Used for
- Treats severe acne or excess hair in women when other treatments fail.
- Treats prostate cancer and reduces sexual drive in selected conditions.
Usual adult dose
Women: commonly 50–100 mg daily, usually with an estrogen-containing contraceptive. Prostate cancer: dosing varies by treatment plan.
Common side effects
- Reduced sex drive and erectile difficulties in men
- Fatigue, low mood, or breast tenderness
- Liver problems
- Blood clots
Important warnings
- Can cause serious liver injury; monitoring may be needed.
- Long-term or high-dose use is linked to meningioma risk.
- May impair fertility and cause sexual-function changes.
- Not for use during pregnancy; people who could become pregnant need reliable contraception.
Pregnancy
Do not use during pregnancy; it may harm fetal development.
Breastfeeding
Avoid during breastfeeding unless a specialist advises otherwise.
Interactions
- Strong CYP3A4 inhibitors may increase exposure.
- Rifampicin and some seizure medicines may reduce its effects.
- May increase effects of other medicines that lower sex drive.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.