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Medical Definition of Methysergide maleate
1. N-[1-(Hydroxymethyl)propyl]-1-methyl-d-lysergamide bimaleate;a serotonin antagonist, weakly adrenolytic, chemically related to methylergonovine; used in the prophylactic treatment of vascular headache (migraine); untoward effects are common. (05 Mar 2000)