Since its discovery, serotonin (5-hydroxytryptamine = 5-HT) has become a major player on the neurotransmitter "stage". Multiple receptor subtypes for 5-HT have been identified and classified, and a vast pharmacology of 5-HT has emerged. In particular, 5-HT has been shown to exert marked effects on the cardiovascular system, central nervous system (CNS) and gastrointestinal (GI) tract, and important ligands have been developed that mimic or block its action selectively. Furthermore, drugs that release 5-HT, and others that prevent its uptake, have been developed. This brief review focuses on the pharmacology of 5-HT agonists and antagonists that exhibit, at least partly, clinical relevance.
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