Generic Cyproterone Acetate And Ethinylestradiol

Common use

Cyproterone acetate and ethinylestradiol is a hormonal medication primarily used to treat moderate to severe acne, hormonal skin conditions, and excess hair growth (hirsutism) in women. It also functions as an oral contraceptive by preventing ovulation and altering the uterine lining and cervical mucus. The combination of cyproterone acetate (a progestin with anti-androgen effects) and ethinyl estradiol (an estrogen) helps reduce androgen levels in the body. This makes it particularly effective in women with polycystic ovary syndrome (PCOS) or elevated androgen levels.

Dosage and direction

The usual dosage is one tablet daily, taken at the same time each day, for 21 consecutive days, followed by a 7-day tablet-free interval. It should be started on the first day of the menstrual cycle or as directed by a healthcare provider. Tablets should be swallowed whole with water and not chewed. For optimal results, Cyproterone acetate and ethinylestradiol must be taken regularly and without interruption.

Precautions

Before using Cyproterone acetate and ethinylestradiol, inform your doctor of any history of blood clots, liver disease, depression, or migraine. Smoking increases the risk of serious cardiovascular side effects, especially in women over 35. The medication is not suitable for pure contraception only and should only be used in women with androgen-related skin conditions. Regular checkups and monitoring of liver function and blood pressure are advised during treatment.

Contraindications

Cyproterone acetate and ethinylestradiol is contraindicated in individuals with a history of thromboembolic disorders, stroke, severe liver disease, breast cancer, or undiagnosed vaginal bleeding. It should not be used during pregnancy or breastfeeding. Women who are over 35 and smoke are at higher risk of cardiovascular complications and should avoid using this medication. Allergy to either cyproterone acetate or ethinyl estradiol also prohibits its use.

Possible side effect

Common side effects may include nausea, headache, breast tenderness, weight gain, and mood changes. Some users may experience spotting, changes in libido, or fluid retention. Rare but serious side effects include blood clots, liver issues, or vision problems. Medical attention is required if signs of thrombosis, severe abdominal pain, or jaundice occur.

Drug interaction

Cyproterone acetate and ethinylestradiol may interact with medications like rifampin, antiepileptics, St. John’s Wort, and some antivirals, potentially reducing contraceptive effectiveness. It can also interfere with the metabolism of other drugs like lamotrigine. Always inform your doctor about all medicines and supplements you are taking. Backup contraception may be necessary when using interacting medications.

Missed dose

If a tablet is missed by less than 12 hours, take it as soon as remembered and continue the pack normally. If more than 12 hours have passed, contraceptive protection may be reduced—follow the instructions in the patient leaflet. Additional contraception may be needed depending on the week of the cycle the pill was missed. Never take two pills at once to make up for a missed one.

Overdose

Symptoms of overdose may include nausea, vomiting, and vaginal bleeding, but serious effects are rare. There is no specific antidote, and treatment is supportive. In case of suspected overdose, contact a healthcare professional or poison control center. Always keep the medication out of reach of children.

Storage

Store Cyproterone acetate and ethinylestradiol at room temperature (20–25°C / 68–77°F), away from moisture and direct sunlight. Keep the tablets in their original packaging until use. Do not use expired medication. Store safely and out of the reach of children and pets.

Disclaimer

We provide only general information about medications which does not cover all directions, possible drug integrations, or precautions. Information at the site cannot be used for self-treatment and self-diagnosis. Any specific instructions for a particular patient should be agreed with your health care adviser or doctor in charge of the case. We disclaim reliability of this information and mistakes it could contain. We are not responsible for any direct, indirect, special or other indirect damage as a result of any use of the information on this site and also for consequences of self-treatment.

Clinical Verification

Last Clinically Updated: August 15, 2026

Written By

Dr. Elena Vance, PharmD

Clinical Specialist in Neuropharmacology

Fact Checked By

Marcus Thorne, MS

Biomedical Data & FDA Label Verification

Medically Reviewed By

Dr. Arthur Campbell, MD

Board-Certified Psychiatrist (ABPN)