Neuroleptic malignant syndrome (NMS) is best described as which of the following?

• A. A life-threatening reaction to antipsychotic medications
• B. A viral infection causing fever
• C. A mild drug reaction
• D. An allergic reaction to antibiotics

Answer: (A)

Neuroleptic malignant syndrome is a life-threatening reaction to antipsychotic medications. It results from abrupt dopamine blockade in the CNS, especially with high-potency drugs or rapid dose increases. The hallmark features are severe muscle rigidity (often lead-pipe rigidity), hyperthermia, and autonomic instability (sweating, tachycardia, fluctuating blood pressure) with altered mental status. Lab findings typically include markedly elevated creatine kinase, leukocytosis, and sometimes myoglobinuria from muscle breakdown.

Because this condition can progress quickly to organ dysfunction, urgent management is essential: stop the offending antipsychotic immediately, implement aggressive cooling and fluid therapy, monitor vital signs and labs closely, and administer treatments that counteract dopamine blockade (such as dantrolene or bromocriptine). Prevention focuses on careful dosing and gradual titration with close observation after starting or adjusting therapy.

Other scenarios like a viral infection or a mild drug reaction don’t explain the combination of severe rigidity, high fever, and autonomic instability with CNS symptoms and elevated CK, which is why this description best fits neuroleptic malignant syndrome.