What is Akathisia
Akathisia is a subjective feeling of severe restlessness, frequently manifesting as pacing or physical agitation, that commonly occurs within the first few days of antipsychotic medication therapy. 1
Clinical Presentation
Akathisia presents with both subjective and objective components:
Subjective symptoms:
- An overwhelming internal sense of restlessness
- Distressing urge to move that the patient often struggles to describe
- Severe discomfort that can be profoundly distressing 2
Objective manifestations:
- Fidgety movements while seated
- Rocking in place while standing
- Pacing or inability to sit still
- Repetitive, purposeless movements
- Inability to remain seated during meals 2, 3
Classification as an Extrapyramidal Side Effect
Akathisia is classified as one of the acute extrapyramidal syndromes associated with antipsychotic medications, alongside acute dystonia and drug-induced Parkinsonism 1. It typically occurs within the first few days of antipsychotic medication therapy or after dose increases 1.
Clinical Significance and Common Pitfalls
Critical diagnostic challenge: Akathisia is often misinterpreted as psychotic agitation or anxiety, leading to inappropriate dose escalation rather than recognition and treatment 2. This misdiagnosis is a common reason for medication noncompliance and can lead to serious adverse outcomes.
Associated risks:
- Poor medication adherence
- Exacerbation of psychiatric symptoms
- In severe cases: aggression, violence, and suicide 4
- Increased risk of relapse due to treatment discontinuation 2
Prevalence
Akathisia prevalence varies by population:
- 21.9% in schizophrenia spectrum disorders
- 12.9% in mood disorders
- Up to 30% of patients on antipsychotics overall 5, 6
While less common with second-generation (atypical) antipsychotics compared to conventional agents, it remains clinically important and all clinicians must be conversant with its recognition 7.
Pathophysiology
The underlying mechanism is postulated to involve dopamine D2 receptor antagonism in the central nervous system, though the exact pathophysiology remains incompletely understood 1, 7.
Assessment Recommendation
As a good practice point, clinicians should systematically assess for akathisia using a validated scale (such as the Barnes Akathisia Rating Scale) before starting antipsychotics and during dosage titration 8.