What is ganirelix?

Ganirelix is a prescription fertility medication also known by the names Ganirelix Acetate and Antagon. It helps fertility doctors control ovulation in women who are undergoing fertility treatment by helping to slow down the production of hormones such as estrogen. Ganirelix must be administered by a qualified and licensed medical professional and is given as an injection under the skin.
Ganirelix (Ganirelix Acetate Injection) and cetrorelix (Cetrotide) are gonadotropin-releasing hormone (GnRH) antagonists similar in structure to GnRH.

These drugs differ from agonists like leuprolide (Lupron) in that they directly cut off the production of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Leuprolide, on the other hand, overstimulates the pituitary gland so it eventually stops producing FSH and LH. Like leuprolide, the GnRH antagonists help prevent premature ovulation during in vitro fertilization (IVF).

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