"I just can't sit still, doctor"
A 40-year-old man was started on an antipsychotic ten days ago for an acute psychotic episode; the dose was increased three days ago. He now cannot sit still in the chair, repeatedly shifting his weight, crossing and uncrossing his legs, and standing to pace the room mid-sentence. Asked how he feels, he says: "It's not just that I'm moving — I feel this awful restlessness inside, like I have to move, like I can't stand being still even for a second. It's driving me mad." There is no abnormal movement of his face, tongue, or lips, and he has no prior history of antipsychotic exposure before this admission.
This case works through a connected sequence — each part builds on what came before, leading to an integrated picture.
Identify
You suspect a movement disorder related to his new medication. Which is it?
Correct — the combination of visible restlessness with a strong subjective drive to move is the akathisia pattern.
Reconsider: is he describing an involuntary movement happening to him, or an inner urge that makes him move? The latter points to akathisia.
Key discriminating feature: The patient describes a subjective inner urge to move, not simply an observed involuntary movement, and there is no abnormal oral or facial movement at all.
Discriminate
Which single feature most reliably rules out tardive dyskinesia here?
Correct. The recent, dose-linked onset is the strongest single clue against tardive dyskinesia.
Distress and age don't reliably separate the two conditions — timing relative to the medication change is the decisive feature.
Key discriminating feature: Akathisia typically emerges soon after starting or raising an antipsychotic, as here; tardive dyskinesia classically emerges after months to years, often on dose reduction, and would show oral or facial movement, which is absent.
Common misconception: Students often assume any restless movement on antipsychotics is tardive dyskinesia by default, rather than checking the specific timing and distribution of the movements.
Elicit
You suspect akathisia. Which question would best explore the experience?
Correct. This directly explores the subjective core of akathisia.
The other questions probe different symptom domains entirely — none of them explores the inner restlessness that defines akathisia.
Clinical interviewing principle: Ask about the subjective drive to move before asking about the movement itself, since the inner restlessness is often what distresses the patient most and is the feature that most reliably separates akathisia from other movement disorders.
Explain
Why is this akathisia rather than tardive dyskinesia?
Correct. Subjective drive plus recent dose-linked onset is the defining combination.
Age and movement quality don't decide this — the subjective quality of the restlessness and its timing relative to the medication change do.
Integrate
Stepping back from this particular patient: if a new patient on antipsychotics showed some kind of abnormal movement and you had time for only two questions before forming an impression, what should those two questions establish, based on what separated akathisia from tardive dyskinesia here?
Correct. Subjective quality and timing relative to dose change are the two findings that, together, sorted this case — and they generalise to any new one.
Demographic details, general medication history, and pain don't do this sorting work — subjective quality (felt urge vs. observed movement) and timing relative to dose change do, and combining them is what actually separated this case.
Summary
This case illustrates the core distinction between akathisia (subjective, drug-induced, recent-onset restlessness) and tardive dyskinesia (observed, involuntary, delayed-onset oral and facial movement). The task was descriptive separation, not diagnosis alone — recognising which felt experience and which timing pattern is present guides the immediate management decision of whether to reduce the dose.
Finish caseReferences
- Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 8, 'Motor Disorders'.