The neurotransmitter serotonin (illustration) has various<unk> s. A<unk>  is an agonist of one or more serotonin<unk> s. They activate serotonin<unk> s in a manner similar to that of serotonin (5-hydroxytryptamine; 5-HT), a neurotransmitter and hormone and the endogenous ligand of the serotonin<unk> s.
Serotonin receptor agonist
Dopamine agonist
Dopamine antagonist
Glycine receptor antagonist
Serotonin–dopamine releasing agent
Muscarinic antagonist
Adrenergic release inhibitor
Alpha-adrenergic agonist