Trazodone is an N-arylpiperazine in which one nitrogen is substituted by a 3-chlorophenyl group, while the other is substituted by a 3-(3-oxo[1,2,4]triazolo[4,3-a]pyridin-2(3H)-yl)propyl group. It has a role as an antidepressant, a sedative, an adrenergic antagonist, a H1-receptor antagonist, a serotonin uptake inhibitor and an anxiolytic drug. It is a N-alkylpiperazine, a N-arylpiperazine, a triazolopyridine and a member of monochlorobenzenes.