Synopsis
Recognise acute dystonia, akathisia, parkinsonism and tardive dyskinesia from their phenomenology and exposure timeline, separate them from psychiatric symptoms, and stop iatrogenic escalation while treating emergencies and preserving mental-health stability.
- Acute dystonia usually appears within hours to several days of a dopamine-blocking medicine or dose increase and causes painful sustained neck, jaw, eye, tongue or trunk postures.
- Akathisia is a distressing inner inability to keep still with pacing, rocking or repeated leg movement; it is commonly mistaken for agitation or worsening psychosis.
- Drug-induced parkinsonism develops over days to months with bradykinesia, rigidity and often bilateral symptoms, although asymmetry does not completely exclude a medication contribution.
- Tardive dyskinesia follows cumulative dopamine-receptor-blocking exposure and commonly produces repetitive oro-bucco-lingual, chewing, choreiform or athetoid movements that can persist after the drug stops.
- Antipsychotics are major causes, but metoclopramide and prochlorperazine are important non-psychiatric exposures; reconcile antiemetics, depot injections and remote courses.
- Neuroleptic malignant syndrome combines dopamine-blocker exposure or dopaminergic withdrawal with rigidity, hyperthermia, altered mental state, autonomic instability and often raised creatine kinase.
- Document a baseline and serial movement examination during antipsychotic treatment because patients may not notice early tongue or finger movements.
- Management starts by identifying the syndrome, reviewing dose and indication, and reducing, stopping or switching collaboratively; abrupt antipsychotic withdrawal can destabilise serious mental illness.
- Anticholinergics treat acute dystonia and sometimes short-term parkinsonism but can worsen tardive dyskinesia and cause cognitive, urinary, ocular and gastrointestinal harm.
- Persistent tardive syndromes require specialist psychiatry and movement-disorder input for lowest-risk antipsychotic strategy and possible VMAT2-directed treatment.
Key red flags
Torticollis, jaw spasm, tongue protrusion, opisthotonus or sustained upward eye deviation soon after dopamine blockade is a painful acute dystonic reaction until an alternative is shown.
Subjective inner torment with pacing, shifting weight and inability to sit after antipsychotic initiation or increase should be named and assessed for self-harm rather than dismissed as non-compliance.
Fever, generalised rigidity, confusion, tachycardia, labile blood pressure and raised creatine kinase after dopamine blockade is a life-threatening systemic syndrome.
Investigation priorities
Link syndrome onset to antipsychotic, antiemetic, antidepressant, dopaminergic and withdrawal events.
Management branches
A painful patterned posture or oculogyric crisis begins soon after a dopamine blocker.
- 1. Assess airway, breathing, swallowing and laryngeal involvement, stop further culprit doses and call emergency support when speech, stridor or ventilation is affected.
- 2. Administer the locally available parenteral anticholinergic, such as imported benztropine, and reassess both the dystonia and cardiorespiratory status.
- 3. Document the drug and reaction prominently, review continuing oral cover where indicated and notify the prescribing team before any rechallenge.
- 4. Reconsider seizure, tetany, strychnine toxicity and structural disease if the response or phenomenology is atypical.