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Thioridazine toxicity--an experimental cardiovascular study of thioridazine and its major metabolites in overdose.

Thioridazine, thioridazine side chain sulfoxide, side chain sulfone and ring sulfoxide were each given to two dogs in incremental doses. Profound changes in cardiac output and blood pressure were seen only in the dogs receiving the ring sulfoxide. Although all four drugs increased the QRS and Q-Tc interval, ventricular arrhythmias and "torsades de pointes" were seen only in dogs receiving the ring sulfoxide. Total plasma concentrations of thioridazine ring sulfoxide were in the same range as those seen in some patients on thioridazine therapy although the free concentrations were higher. Thioridazine ring sulfoxide appears to be the most toxic metabolite of thioridazine.