Most antipsychotic medications antagonize dopamine D2 receptors, which can markedly worsen the motor symptoms of Parkinson's disease and may precipitate neuroleptic malignant syndrome.
Typical antipsychotics are contraindicated in Parkinson's disease due to severe motor worsening.
Clozapine and quetiapine are the only antipsychotics with a relatively safe profile for Parkinson's patients.
Monitor for neuroleptic malignant syndrome, early recognition is critical.
Any change in antipsychotic therapy should be coordinated with the movement‑disorder specialist.
Antipsychotics block central D2 receptors in the nigrostriatal pathway, reducing dopaminergic neurotransmission that is already deficient in Parkinson's disease. This further impairs basal ganglia signaling, leading to exacerbation of bradykinesia, rigidity, and tremor. In severe cases, abrupt dopamine blockade can trigger neuroleptic malignant syndrome, a life‑threatening hypermetabolic state.
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