It is noteworthy that 1-(3-Chlorphenyl)piperazine (m-CPP), resulting from N-dealkylation of Trazodone, is a major circulating metabolite in humans common to several antidepressants including Trazodone, Nefazodone, and Etoperidone. The metabolite m-CPP is of significant interest because it has 5-HT2C agonistic and 5-HT2A antagonistic properties. It has also been suggested that m-CPP may contribute to the antidepressant efficacy of Trazodone.