The FDA has approved degarelix (Firmagon - Ferring), a synthetic decapeptide gonadotropin-releasing hormone (GnRH) receptor antagonist, for rapid medical castration of men with advanced prostate cancer. Abarelix (Plenaxis), the first GnRH antagonist approved by the FDA, was withdrawn from the US market because of immediate hypersensitivity reactions.

Two controlled-release formulations of triptorelin (trip toe rel' in) pamoate, an agonist analog of human luteinizing hormone-releasing hormone (LHRH), are now available in the US for parenteral treatment of advanced prostate cancer. Trelstar Depot is given every 4 weeks and Trelstar LA every 12 weeks. Triptorelin has been available in some countries since 1986.

The FDA has approved elagolix (Orilissa – AbbVie), an oral gonadotropin-releasing hormone (GnRH) antagonist, for management of moderate to severe pain associated with endometriosis.

Myfembree (Myovant/Pfizer), an oral fixed-dose combination of the gonadotropin-releasing hormone (GnRH) receptor antagonist relugolix, the estrogen estradiol, and the progestin norethindrone acetate, has been approved by the FDA for management of heavy menstrual bleeding associated with uterine leiomyomas (fibroids) in premenopausal women. It is the second product to be approved in the US for this indication; Oriahnn, which contains the GnRH receptor antagonist elagolix in combination with estradiol and norethindrone acetate, was approved earlier. Relugolix was approved for...

The Norplant System (Wyeth-Ayerst) for subdermal delivery of the synthetic progestin levonorgestrel was recently approved by the US Food and Drug Administration for use as a long-term contraceptive.