In vitro studies of some chlorpromazine metabolites as potential N-methyltransferase inhibitors.

A series of chlorpromazine metabolites were tested as inhibitors of rabbit lung N-methyltransferase activity in vitro. The hydroxylated metabolites were found to be more effective with the 7,8 dioxy derivatives the most potent. Various chelating agents had no effect, suggesting that the inhibitory effects of the hydroxy metabolites were not due to divalent cation chelation.