Heinz Lehmann was the first doctor in Canada to treat psychosis with:

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Heinz Lehmann was the first doctor in Canada to treat psychosis with Chlorpromazine, also known as Thorazine. It was the first antipsychotic medication and revolutionized the treatment of schizophrenia and other psychotic disorders. Lobotomy and Electroconvulsive shock treatment were also used at the time, but they were considered more invasive and controversial. Haloperidol was developed later as another antipsychotic medication.

Heinz Lehmann Was the First Doctor in Canada to Treat