<prompt> Neuroleptic malignant syndrome is caused byCarbamazepineClonazepamHaloperidolFluoxetine  <response>: Ans. c Haloperidol. Ref. Harrison, Internal Medicine 18thTable 16-1Malignant neuroleptic syndrome MNS is a rare dose-related adverse effect of neuroleptics characterised by marked rigidity, immobility, tremors, fever, fluctuating BP and HR, semiconsciousness and myoglobin in blood. Drugs causing MNS are Phenothiazines; butyrophenones, including haloperidol and bromperidol; fluoxetine; loxapine; tricyclic dibenzodiazepines; metoclopramide; domperidone; thiothixene; molindone; withdrawal of dopaminergic agents. Drug of choice for Rx of MNS is Dantrolene. MH 2006; However, bromocryptine may also be of use. 