What indicates possible onset of Neuroleptic Malignant Syndrome in a patient on antipsychotics who develops rigidity, fever, sweating, BP fluctuations and confusion?

• A. Tardive dyskinesia
• B. Neuroleptic malignant syndrome
• C. Influenza
• D. Extrapyramidal reactions

Answer: (B)

Recognizing neuroleptic malignant syndrome (NMS) is key here. When someone on antipsychotics develops severe muscular rigidity, high fever, sweating, autonomic instability (like fluctuating blood pressure), and confusion, this combination strongly points to NMS. It’s a dangerous reaction to dopamine blockade in the brain, often occurring within days to weeks of starting or increasing an antipsychotic. The rigidity is typically profound, sometimes described as lead-pipe, and the fever and autonomic symptoms (BP swings, tachycardia, diaphoresis) reflect systemic dysregulation.

This presentation is not typical of influenza or a simple viral fever, and extrapyramidal reactions like dystonia or parkinsonism lack the marked hyperthermia and autonomic instability. Tardive dyskinesia involves abnormal involuntary movements after long-term use, not the acute, life-threatening picture described.

Because of the seriousness, stop the antipsychotic and pursue urgent medical evaluation, cooling, hydration, and appropriate treatment per protocol (such as agents like dantrolene or bromocriptine as indicated).