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The antipsychotic drug haloperidol can be metabolised to pyridinium metabolites haloperidol pyridinium (HP+) and reduced haloperidol pyridinium (RHP+). These pyridinium metabolites were proposed to contribute to the extrapyramidal side effects of haloperidol, because they are structural analogues of N-methyl-4-phenylpyridinium (MPP+), a well-known neurotoxin. RHP+ can be oxidized to HP+ by CYP1A1. In the current study, the oxidation of RHP+ to HP+ was investigated using human placenta microsomal preparations which contain relatively high levels of CYP1A1.

In vitro Characterization of the Oxidation of a Pyridinium Metabolite of Haloperidol by Human Placenta: The Effect of Smoking