A gonadotropin-releasing hormone agonist (GnRH agonist, GnRH–A) is a synthetic peptide modeled after the hypothalamic neurohormone GnRH that interacts with the gonadotropin-releasing hormone receptor to elicit its biologic response, the release of the pituitary hormones FSH and LH.
GnRH agonists are pregnancy category X drugs.
Read more about Gonadotropin-releasing Hormone Agonist: Flare Effect and Downregulation, Agonists With Double and Single Substitutions, Administration, Uses, Side Effects