Butanserin (; developmental code name R-53393) is a serotonin 5-HT2 receptor antagonist and α1-adrenergic receptor antagonist which was studied as an antihypertensive agent but was never marketed. It was first described in the scientific literature by 1984.
See also Serotonin 5-HT2A receptor antagonist α1-Adrenergic receptor antagonist
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