A 30-year-old man who was recently staed on haloperidol 30mg/day developed hyperpyrexia, muscle rigidity, akinesia, mutism, sweating, tachycardia and increased blood pressure. The investigations showed increased VVBC count, increased creatinine phosphokinase. There is no history of any other drug intake or any signs of infection. The most likely diagnosis is:
B i.e. Neuroleptic malignant syndrome
Drug overdose
Neuroleptic malignant syndrome
Drug induce Parkinsonism
Tardive dyskinesia