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The use of nicotinic acid and pyridoxine in the treatment of schizophrenia.

As part of the Canadian Mental Health Association Collaborative Study, the hypothesis that combined administration of nicotinic acid and pyridoxine has greater therapeutic effects than the component drugs in chronic schizophrenic patients was tested. This could not be substantiated in a 48-week study in which supplementation of neuroleptic treatment with a single vitamin, i.e., nicotinic acid or pyridoxine, produced significant therapeutic changes, while supplementation with both vitamins did not.