Danazol suppresses the hormone signals from the pituitary gland that drive the menstrual cycle. That quietens tissue which responds to those hormones, which is why it is used in endometriosis and in some breast conditions.

What Danazol Is Used For

Endometriosis and the pain that comes with it
Fibrocystic breast disease and breast pain
Hereditary angioedema
Heavy menstrual bleeding, in selected cases

Common Side Effects

Weight gain and fluid retention
Acne and oily skin
Irregular periods or no periods during treatment
Voice deepening and increased body hair, which may not fully reverse

Precautions

Danazol must not be taken in pregnancy, and a non hormonal method of contraception is needed throughout treatment. Report any deepening of the voice promptly, as that change can be permanent. Liver function is monitored, and yellowing of the eyes or abdominal pain must be reported. It is prescribed for defined courses rather than indefinitely.

This page is general information only. It is not a substitute for advice from your doctor or pharmacist, and it does not include dosage. Always follow the directions given to you and read the leaflet inside the pack.