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LH-RH agonist (... A-guh-nist)
A substance that keeps the testicles and ovaries from making sex hormones by blocking other hormones that are needed to make them. In men, LH-RH agonists cause the testicles to stop making testosterone. In women, they cause the ovaries to stop making estrogen and progesterone. Some LH-RH agonists are used to treat prostate cancer. Also called GnRH agonist, gonadotropin-releasing hormone agonist, and luteinizing hormone-releasing hormone agonist.