A young male patient who is a case of schizophrenia was staed on haloperidol 5 mg. On 3rd day, he came to the hospital accompanied by his father with uprolling of both eyes. A complete neurological examination revealed no spasticity or any other abnormalities. Visual acuity was found to be normal. Most likely diagnosis is:

**Core Concept**
Haloperidol is a typical antipsychotic medication that blocks dopamine receptors in the brain, particularly D2 receptors. This blockade can lead to extrapyramidal side effects, including oculogyric crisis, which is characterized by involuntary eye movements.

**Why the Correct Answer is Right**
The patient's symptoms, such as uprolling of both eyes, are consistent with an oculogyric crisis, a type of extrapyramidal side effect associated with antipsychotic medications like haloperidol. This occurs when the blockade of dopamine receptors in the brain affects the nigrostriatal pathway, leading to abnormal movement of the eyes. The normal visual acuity and lack of other neurological abnormalities suggest that this is a localized effect of the medication.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we will move on to the other options.
**Option B:** This option is not relevant to the scenario described, as it does not explain the patient's symptoms of oculogyric crisis.
**Option C:** This option is incorrect because it does not specify the type of movement disorder that is likely to occur with haloperidol use.

**Clinical Pearl / High-Yield Fact**
Extrapyramidal side effects, including oculogyric crisis, are more likely to occur with high-potency antipsychotics like haloperidol, especially at initial doses. This can be mitigated by starting with lower doses and gradually increasing as needed.

**Correct Answer:** C. Oculogyric crisis

✓ Correct Answer: A. Acute dystonia