Acyline (developmental code name MER-104) is a gonadotropin-releasing hormone analogue (GnRH analogue) and gonadotropin-releasing hormone antagonist (GnRH antagonist) which was never marketed. It has been shown to suppress gonadotropin and testosterone levels in men. Acyline is a peptide and under normal circumstances is not orally active. For this reason, it has instead been administered by subcutaneous injection.
See also Gonadotropin-releasing hormone receptor § Antagonists
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