Danazol is a derivative of the synthetic steroid ethisterone, a modified testosterone. It was approved by the Food and Drug Administration (FDA) as the first drug to treat specifically endometriosis, but its role as a treatment for endometriosis has been largely replaced by the GnRH agonists.
The agent is fat-soluble, has a molecular weight of 337.5. Its CAS registry number is 17230-88-5.
Danazol decreases the pituitary hormones FSH and LH and exerts an antiproliferative effect upon the endometrium, leading to amenorrhea. This effect is useful for patients with endometriosis. Commonly, pelvic pain associated with endometriosis is improved as well.
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