The incidence of Parkinson's-like symptoms as a side effect of typical antipsychotic drugs implies a dopamine connection in schizophrenia.

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Parkinson's disease is caused by a loss of dopamine-producing cells in the brain. Typical antipsychotic drugs block dopamine receptors, which can lead to Parkinson's-like symptoms as a side effect. This suggests that dopamine is involved in the pathology of schizophrenia, which is also treated with antipsychotic medication.

The Incidence of Parkinson's-Like Symptoms as a Side Effect of Typical