A patient of schizophrenia was staed on haloperidol 5 mg. Next day, he presented with uprolling of eyes. Complete neurological examination revealed no spasticity or any other abnormality. Visual acuity and ophthalmoscopic findings are normal. Most likely diagnosis is :
High-Yield Explanation
Acute muscular dystonia is the earliest appearing extrapyramidal symptom caused by antipsychotic drugs like haloperidol. REF: HARRISONS 20TH ED.