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# Antipsychotic-induced movement disorders (dystonia, akathisia, parkinsonism, tardive dyskinesia)

Abnormal movements caused by medicines that block dopamine, mainly antipsychotics. Some appear within hours; others, like tardive dyskinesia, after years.

Updated 2026-11-01

## Structures involved

Tap one to see what it is and open it in 3D.

- [Caudate nucleus](https://durgical.com/en/anatomy/caudate-nucleus/)
- [Putamen](https://durgical.com/en/anatomy/putamen/)
- [Globus pallidus](https://durgical.com/en/anatomy/globus-pallidus/)
- [Substantia nigra](https://durgical.com/en/anatomy/substantia-nigra/)
- [Thalamus](https://durgical.com/en/anatomy/thalamus/)
- [Midbrain](https://durgical.com/en/anatomy/midbrain/)
- [Frontal lobe](https://durgical.com/en/anatomy/superior-frontal-gyrus/)

## Why it happens

- [Injury by therapeutic drugs: the classic examples](https://durgical.com/en/general-pathology/injury-by-therapeutic-drugs-the-classic-examples/)
- [Basal ganglia and movement control](https://durgical.com/en/physiology/basal-ganglia-and-movement-control/)
- [The main neurotransmitters](https://durgical.com/en/physiology/the-main-neurotransmitters/)

## What it is

A group of extrapyramidal syndromes caused by drugs that block dopamine D2 receptors, above all antipsychotics but also antiemetics such as metoclopramide. The four classic forms are acute dystonia, akathisia, drug-induced parkinsonism and tardive dyskinesia, which differ in timing, appearance and treatment.

## Who gets it

Common wherever antipsychotics are used, including Colombian psychiatric wards, emergency departments (where antiemetics and rapid tranquillisation are frequent triggers) and primary care. Acute reactions are more frequent with high-potency first-generation agents such as haloperidol; tardive dyskinesia accumulates with years of exposure and is more common in older adults.

## Causes

- First-generation (typical) antipsychotics, especially high-potency agents such as haloperidol
- Second-generation antipsychotics, at a lower but real rate (risperidone more than quetiapine or clozapine)
- Dopamine-blocking antiemetics and prokinetics such as metoclopramide and prochlorperazine
- Rapid dose increases, high doses or parenteral use

## Risk factors

- Acute dystonia: young age, male sex, high-potency agents and no prior exposure
- Parkinsonism and tardive dyskinesia: older age and female sex
- Long cumulative exposure to dopamine blockers (tardive dyskinesia)
- Diabetes, mood disorders, substance use and pre-existing brain injury
- Earlier acute extrapyramidal symptoms, which predict tardive dyskinesia

## Pathophysiology

Dopamine from the [substantia nigra](https://durgical.com/en/anatomy/substantia-nigra/) normally balances acetylcholine and other signals in the striatum ([caudate nucleus](https://durgical.com/en/anatomy/caudate-nucleus/) and [putamen](https://durgical.com/en/anatomy/putamen/)). Blocking D2 receptors in this nigrostriatal pathway leaves relative cholinergic excess, which explains acute dystonia and parkinsonism and why anticholinergic drugs help them. Tardive dyskinesia is thought to arise from long-term receptor blockade that makes striatal D2 receptors more numerous and sensitive, producing excess movement that can persist after the drug is stopped.

## Classification

- Acute dystonia (hours to about 5 days): sustained painful muscle spasms
- Akathisia (days to weeks): inner restlessness with an urge to move
- Drug-induced parkinsonism (weeks): bradykinesia, rigidity and tremor, usually symmetric
- Tardive dyskinesia (months to years): involuntary choreiform movements, mainly orofacial

## Symptoms and signs

- Dystonia: neck twisting (torticollis), jaw or [tongue](https://durgical.com/en/anatomy/tongue/) spasm, eyes forced upwards (oculogyric crisis), arching of the back
- Akathisia: feeling unable to stay still, pacing, rocking and shifting weight from foot to foot
- Parkinsonism: slowness, stiffness, mask-like face, shuffling gait and resting tremor
- Tardive dyskinesia: lip smacking, chewing, tongue protrusion, grimacing and writhing limb or trunk movements
- Distress, anxiety and poor adherence to treatment

## Red flags

- Laryngeal dystonia with stridor or difficulty breathing
- Fever, severe rigidity, confusion and unstable vital signs (possible neuroleptic malignant syndrome)
- Severe akathisia with agitation or suicidal thoughts
- Inability to swallow, with risk of aspiration

## Diagnosis

**Clinical**
Clinical diagnosis based on the type of movement and its timing after starting, increasing or stopping a dopamine blocker. Akathisia is easily mistaken for psychotic agitation or anxiety. The Abnormal Involuntary Movement Scale (AIMS) is used to screen and follow tardive dyskinesia; other scales rate akathisia and parkinsonism.

**Tests**
Usually none. Creatine kinase, temperature and vital signs when neuroleptic malignant syndrome is a concern; copper studies, thyroid function or other tests when the movement disorder is atypical.

**Imaging**
Not needed in typical cases. Brain imaging when focal signs, an atypical course or another neurological disease is suspected.

## Differential diagnosis

- Neuroleptic malignant syndrome and serotonin syndrome
- Idiopathic Parkinson disease
- Psychotic agitation or anxiety (versus akathisia)
- Huntington disease, Wilson disease and other choreas
- Seizures, tetany or tetanus (versus acute dystonia)

## Goal of treatment

Relieve symptoms quickly, protect the airway in severe dystonia, lower or change the causative drug when possible, and prevent tardive dyskinesia by using the lowest effective exposure with regular monitoring.

## Treatment

**Acute**
Acute dystonia is treated urgently with a parenteral anticholinergic agent (such as benztropine or biperiden) or an antihistamine such as diphenhydramine, which usually work within minutes; laryngeal dystonia is managed as an airway emergency.

**Medical**
Akathisia: lowering the dose or switching to an agent with less risk, and adding a lipophilic beta-blocker such as propranolol, a benzodiazepine or, in some cases, mirtazapine.

**Medical**
Parkinsonism: dose reduction or switching to a second-generation agent with low D2 affinity (such as quetiapine or clozapine); anticholinergics or amantadine when symptoms persist.

**Medical**
Tardive dyskinesia: review of the need for the antipsychotic, switching to clozapine in some patients, and VMAT2 inhibitors (valbenazine, deutetrabenazine, tetrabenazine). Anticholinergics are avoided because they can worsen it.

**Follow-up**
Nursing care: baseline and periodic movement scales (AIMS), watching for dystonia after the first doses, swallowing and fall safety, and asking about restlessness and adherence.

## Drugs for this condition

- [Benzatropine](https://durgical.com/en/pharmacology/benzatropine/)
- [Amantadine](https://durgical.com/en/pharmacology/amantadine/)
- [Trihexyphenidyl](https://durgical.com/en/pharmacology/trihexyphenidyl/)
- [Biperiden](https://durgical.com/en/pharmacology/biperiden/)
- [Tetrabenazine](https://durgical.com/en/pharmacology/tetrabenazine/)
- [Deutetrabenazine](https://durgical.com/en/pharmacology/deutetrabenazine/)
- [Valbenazine](https://durgical.com/en/pharmacology/valbenazine/)

## Complications

- Airway obstruction from laryngeal dystonia
- Stopping treatment and psychotic relapse
- Suicidal behaviour and violence linked to akathisia
- Falls and fractures from parkinsonism
- Persistent, disfiguring tardive dyskinesia with stigma and difficulty eating or speaking

## Prognosis

Acute dystonia, akathisia and parkinsonism usually resolve within days to weeks after treatment or dose change. Tardive dyskinesia may persist for years or be permanent, although it often improves with VMAT2 inhibitors or after the drug is withdrawn.

## Prevention

- Lowest effective antipsychotic dose and avoiding unnecessary long-term antiemetic use
- Prophylactic anticholinergic in young patients starting high-potency agents, in selected cases
- Baseline and regular screening with the AIMS scale

## Test yourself

Think of the answer, then tap the question to see it.

## Which movement disorder appears hours after a first dose of haloperidol in a young man, with torticollis and eyes deviated upwards?

Acute dystonia, treated with a parenteral anticholinergic or diphenhydramine.

## What is the typical timing of the four antipsychotic movement disorders (rule of 4s)?

Dystonia within about 4 hours, akathisia about 4 days, parkinsonism about 4 weeks and tardive dyskinesia after about 4 months.

## Which drug class is first-line for tardive dyskinesia?

VMAT2 inhibitors, such as valbenazine or deutetrabenazine.

## Why are anticholinergics avoided in tardive dyskinesia?

They can worsen it, although they help acute dystonia and drug-induced parkinsonism.

## Which beta-blocker is commonly used to treat akathisia?

Propranolol.

[Add to my cards (5)](https://durgical.app/estudiar/?add=/en/conditions/antipsychotic-induced-movement-disorders/)

## Related conditions

- [Schizophrenia](https://durgical.com/en/conditions/schizophrenia/)
- [Bipolar disorder](https://durgical.com/en/conditions/bipolar-disorder/)
- [Neuroleptic malignant syndrome](https://durgical.com/en/conditions/neuroleptic-malignant-syndrome/)
- [Parkinson disease](https://durgical.com/en/conditions/parkinson-disease/)
- [Huntington disease](https://durgical.com/en/conditions/huntington-disease/)
- [Wilson disease](https://durgical.com/en/conditions/wilson-disease/)
- [Restless legs syndrome](https://durgical.com/en/conditions/restless-legs-syndrome/)
- [Catatonia](https://durgical.com/en/conditions/catatonia/)

Educational information, not medical advice. For any symptom, see a health professional.

Sources: [Tardive dyskinesia](https://medlineplus.gov/ency/article/000685.htm) (MedlinePlus (U.S. National Library of Medicine), 2025); [Secondary parkinsonism](https://medlineplus.gov/ency/article/000759.htm) (MedlinePlus (U.S. National Library of Medicine), 2025).

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Source: https://durgical.com/en/conditions/antipsychotic-induced-movement-disorders/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/conditions/antipsychotic-induced-movement-disorders/