A 27 year-old man presents with a movement disorder characterized by restlessness and a compelling needs to be in a constant motion. He had a diagnosis of psychosis two weeks ago and he started treatment right after his last visit. What is the most likely diagnosis?

A- Restless leg syndrome

B- Dystonia

C- Akathisia

D- Parkinsonism

E- Tardive dyskinesia


This patient has akathisia, which is characterized by restlessness, and compelling needs to be in constant motion. This side effect usually occurs after 2 weeks of starting treatment with antipsychotics. Dystonia usually happens in the first week. Parkinsonism and restless leg syndrome have different clinical pictures and they usually occur after 2-3 months of using antipsychotics. Tardive dyskinesia occurs after years of using antipsychotics.

The correct answer is C