Cyproterone Acetate is an anti-androgen and progestogen medication used to regulate hormonal activity in various clinical indications.
Cyproterone acetate belongs to the class of antiandrogen hormones. It works by reducing the effects of male sex hormones in the body. In Hong Kong, this ingredient is found in products such as Diane 35 and the combination pill cyproterone acetate and ethinylestradiol.
Several licensed medicines contain cyproterone acetate. The most widely recognised brand is Diane 35, a tablet that pairs cyproterone acetate with ethinylestradiol. Another product is the combined formulation cyproterone acetate and ethinylestradiol, marketed under various generic names. These medicines are usually supplied as oral tablets, with strengths that differ according to the specific product. Both brand-name and generic versions are approved by Hong Kong’s Department of Health and can be dispensed by pharmacies when a prescription is required.
These uses are recognised in the product’s authorised information for Hong Kong. The medication is generally prescribed for adult women who need hormonal regulation for the above reasons.
Cyproterone acetate blocks the body’s receptors for male sex hormones and also reduces the production of those hormones. With less androgen activity, the skin produces less oil, hair growth slows, and hormonal cycles become steadier. Effects are usually seen within a few weeks of consistent use, though the exact timing can differ between products.
Most people experience only mild, short-lasting effects. Typical reports include minor breast tenderness, occasional nausea, and temporary changes in menstrual flow. These sensations often settle as the body adjusts to the medication.
Rarely, severe allergic responses may occur. Warning signs include swelling of the face or throat, difficulty breathing, or a sudden rash that spreads quickly. If any of these appear, urgent medical assistance is needed.
Women who are pregnant, planning to become pregnant, or who have a history of blood-clotting disorders should avoid products containing cyproterone acetate. People with liver disease or a personal history of certain cancers may also need special consideration. Allergy to cyproterone acetate or any of the tablet’s excipients is a contraindication.
Cyproterone acetate can interact with several other medicines, including some antiepileptic drugs, anticoagulants, and certain herbal supplements. Alcohol may increase the risk of liver strain, and grapefruit juice can affect hormone levels. Lifestyle factors such as prolonged sun exposure or operating heavy machinery usually do not pose a problem, but each formulation may have specific advice. For a full interaction list, refer to the individual product information.
Store tablets in a cool, dry place away from direct sunlight and out of reach of children. The typical course of treatment varies; some users take the medication for a short period to manage acne, while others may use it longer for menstrual regulation. Always follow the directions printed on the packaging of the specific product you receive. For detailed usage, dosing, and administration, refer to your specific medication’s information.
Antiandrogen: A substance that reduces the effect of male hormones in the body.
Hormonal regulation: Adjusting the balance of hormones to improve a medical condition.
Generic name: The standard, non-brand name assigned to a medication’s active ingredient.
This article offers general educational information about cyproterone acetate as an active substance used in various medicines. Its purpose is to help patients better understand the ingredient and the conditions it is used to treat. It is not a substitute for professional medical advice or for the specific instructions provided with individual products. Medicines containing cyproterone acetate may differ in formulation, strength, and directions for use. Always consult the labeling of your particular medication and follow your healthcare provider’s guidance for complete information on proper use, dosage, and safety.
