Answer
It reduces androgen production and blocks androgen effects on the skin, helping reduce excess oil and inflammation. It is reserved for androgen-sensitive moderate to severe acne when appropriate topical treatment or systemic antibiotics have not worked.
Sources for this answer
- Co-cyprindiol 2000/35 microgram Film-coated Tablets — Current selected SmPCemc · Summary of Product Characteristics
- Dianette — Current selected SmPC