Triazoledione (developmental code name BMS-180492) is a phenylpiperazine compound and a major metabolite of the antidepressant nefazodone. It is active, but with substantially reduced potency compared to nefazodone (approximately one-seventh). As such, it has been suggested that it is unlikely that triazoledione contributes significantly to the pharmacology of nefazodone. However, triazoledione may reach concentrations as great as 10 times those of nefazodone, and hence could still be a significant contributor to its therapeutic effects.
Triazoledione shows significant affinity for the serotonin 5-HT<sub>1A</sub> and 5-HT<sub>2A</sub> receptors, the ñ<sub>1</sub>-adrenergic receptor, and the histamine H<sub>1</sub> receptor. It shows negligible affinity for the serotonin and norepinephrine transporters and the muscarinic acetylcholine receptors.