A 28-year-old man with schizophrenia is started on haloperidol for acute agitation. Within 48 hours, he develops severe muscle rigidity, hyperthermia (39.8°C), altered mental status, and markedly elevated creatine kinase (CK 4200 U/L). What is the most common causative antipsychotic for neuroleptic malignant syndrome (NMS)?

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