Haldol Tablet (Haloperidol) Side Effects in Pakistan

Some of Haldol (Haloperidol)'s side effects — especially extrapyramidal effects (EPS) — can seem alarming. This guide details each side effect, distinguishes treatable from serious ones, and explains when to see a doctor immediately.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-06-17

Side Effects

Quick Answer

Common side effects of Haldol (Haloperidol) include extrapyramidal effects (EPS) — dystonia (muscle spasms), akathisia (restlessness), and drug-induced parkinsonism — which are very common. Serious effects: Neuroleptic Malignant Syndrome (NMS — high fever + rigidity + confusion = EMERGENCY), tardive dyskinesia (long-term — potentially irreversible), QT prolongation. It is essential to inform the patient and family about EPS in advance.

Side Effects at a Glance

Common

Extrapyramidal effects (EPS) — very common:
Dystonia (acute muscle spasms — tongue, neck, eyes, back — frightening but treatable)
Akathisia (restlessness, inability to sit still — often misdiagnosed as worsening anxiety)
Drug-induced parkinsonism (tremor, rigidity, bradykinesia)
Sedation
Dry mouth, constipation (anticholinergic — less than low-potency antipsychotics)
Weight gain
Hyperprolactinaemia (galactorrhoea, menstrual irregularity, sexual dysfunction)

Serious — See a Doctor

Neuroleptic Malignant Syndrome (NMS) — EMERGENCY: hyperthermia, severe muscle rigidity, altered consciousness, autonomic instability — stop drug, hospitalize immediately
Tardive dyskinesia (long-term — potentially irreversible involuntary movements: lip smacking, tongue protrusion, limb movements)
QT prolongation / torsades de pointes (cardiac arrhythmia)
Severe EPS requiring anticholinergic treatment (benztropine, trihexyphenidyl)

When to See a Doctor Immediately

HIGH FEVER + SEVERE MUSCLE RIGIDITY + CONFUSION — NMS EMERGENCY: stop drug, go to hospital immediately
Severe sudden muscle spasms (acute dystonia — treatable with anticholinergics; see a doctor immediately)
Constant restlessness / inability to stay still (akathisia — tell doctor, not anxiety)
Irregular heartbeat (QT prolongation)
New involuntary repetitive movements of mouth, tongue, face (tardive dyskinesia — tell psychiatrist)

Haldol Tablet (Haloperidol) Side Effects (Nuksanat)

Haldol Tablet (Haloperidol) is an effective antipsychotic but carries a significant risk of extrapyramidal side effects (EPS) — especially among first-generation typical antipsychotics. It is essential to inform the patient and family in advance.

IMPORTANT: EPS (Extrapyramidal Side Effects) — Very Common

EPS is the most common and alarming group of side effects from Haloperidol. These are treatable — but it is essential to inform the patient in advance so they do not panic:

Dystonia (Acute Muscle Spasms)

Sudden, painful muscle contractions — tongue, neck (torticollis), eyes (oculogyric crisis), back
Frightening but treatable — anticholinergics (benztropine/trihexyphenidyl) provide immediate relief
See a doctor immediately agar dystonia ho

Akathisia (Restlessness)

Constant restlessness, inability to sit still — feet keep moving
Often misdiagnosed as anxiety — this is not anxiety, it is EPS
Inform the psychiatrist — dose reduction or medication change may be needed

Drug-Induced Parkinsonism

Tremor, rigidity, bradykinesia (slow movements) — Parkinson's disease jaisi
Managed with anticholinergics; also improves with dose reduction or drug change

Tardive Dyskinesia (Long-Term Risk)

After long-term use: involuntary repetitive movements — lip smacking, tongue protrusion, chewing, limb movements
Potentially irreversible — regular psychiatrist review is essential

Common Side Effects (Aam Nuksanat)

EPS (dystonia, akathisia, parkinsonism) — very common
Sedation
Dry mouth, constipation (anticholinergic)
Weight gain
Hyperprolactinaemia (galactorrhoea, menstrual irregularity, sexual dysfunction)
Blurred vision, urinary retention (uncommon)

Serious Side Effects (Sanjeedah Nuksanat)

NMS — Neuroleptic Malignant Syndrome (EMERGENCY)

HIGH FEVER + SEVERE MUSCLE RIGIDITY + ALTERED CONSCIOUSNESS + autonomic instability (sweating, unstable BP/pulse)

Rare but life-threatening
IMMEDIATELY: stop the drug and go to hospital
Intensive care treatment required

QT Prolongation / Torsades de Pointes

Cardiac arrhythmia — especially when combined with other QT-prolonging drugs
ECG monitoring — required in cardiac patients

When to See a Doctor (Kab Doctor Se Milna Zaroori Hai)

HIGH FEVER + RIGIDITY + CONFUSION — NMS: GO TO HOSPITAL IMMEDIATELY
Severe sudden muscle spasms
Constant restlessness
Irregular heartbeat (QT prolongation)
New involuntary repetitive movements of mouth/tongue/face (tardive dyskinesia)

Side Effects Summary Table

Type	Side Effect	Action
Very Common	EPS (dystonia, akathisia, parkinsonism)	See psychiatrist immediately
Common	Sedation	Monitor
Common	Hyperprolactinaemia	Doctor discuss
Serious	NMS	EMERGENCY — stop, hospital
Serious	Tardive dyskinesia	Psychiatrist regular review
Serious	QT prolongation	ECG monitoring

Reporting Side Effects

If you notice any unexpected side effect, report it on the DRAP pharmacovigilance portal: https://www.dra.gov.pk/pharmacovigilance

The information in this guide is for educational purposes only. If you notice any side effect, contact your psychiatrist or doctor immediately.

Frequently Asked Questions

Haloperidol (Haldol) ke common side effects kya hain?

The most common are extrapyramidal effects (EPS): dystonia (sudden muscle spasms), akathisia (restlessness), and drug-induced parkinsonism. Sedation, dry mouth, and weight gain also occur.

Haloperidol se muscle spasms (dystonia) kyun hote hain?

Haloperidol blocks dopamine D2 receptors — this causes dystonia (acute muscle spasms), akathisia, and parkinsonism in the extrapyramidal pathways. It is treatable with anticholinergics (benztropine) — see a doctor immediately.

NMS kya hai aur Haloperidol se kab hota hai?

NMS (Neuroleptic Malignant Syndrome) is a rare but life-threatening emergency — HIGH FEVER + SEVERE MUSCLE RIGIDITY + CONFUSION + autonomic instability. If these signs are present, IMMEDIATELY stop the drug and go to hospital.

Tardive dyskinesia kya hai?

Tardive dyskinesia can occur with long-term Haloperidol use — involuntary repetitive movements (mouth, tongue, face, limbs). It is potentially irreversible. The psychiatrist should conduct regular reviews.

Akathisia aur anxiety mein farq kya hai?

In akathisia, the patient experiences constant restlessness — it is difficult to remain seated and the feet keep moving. This is different from anxiety — it is EPS; the anxiety dose should not be increased. Inform the psychiatrist immediately.

Sources

DRAP Registered Products Database — Drug Regulatory Authority of Pakistan
WHO Model List of Essential Medicines, 23rd ed. (2023) — World Health Organization
British National Formulary (BNF) — BMJ Group & Pharmaceutical Press

Medical disclaimer

This page is for educational use only and does not replace professional medical advice. Always confirm diagnosis, dose, and interactions with a qualified doctor or pharmacist before starting or changing any medicine.