“Since the injection his neck has been stiff and his tongue is heavy. We were terrified.” A frightening scene that many families describe after haloperidol is started, and it is usually a known movement effect with a quick treatment. But knowing the difference between a bothersome effect and an emergency makes a big difference.
What is haloperidol (Haldol)?
Haloperidol is among the oldest and most widely used antipsychotics in the world. The StatPearls reference describes it as a typical first-generation antipsychotic that blocks D2 dopamine receptors in the brain, easing the positive symptoms of schizophrenia such as hallucinations and delusions. One of its best-known brand names is Haldol, and Haldol Decanoas is available in Egypt, a long-acting intramuscular injection given at long intervals instead of daily tablets.
What haloperidol is used for
- Schizophrenia and psychotic disorders.
- Motor and vocal tics in Tourette syndrome.
- Confusion and difficulty thinking caused by a severe physical or psychiatric illness, according to the US National Library of Medicine.
- Some severe behavioral disorders, among the uses listed by the StatPearls reference.
Long-acting injections help people who forget the medication or refuse it, because stopping an antipsychotic is one of the most common causes of relapse, as the guide to schizophrenia treatment explains.
Movement effects of haloperidol
Neck spasm, tongue protrusion or a tight throat, which may appear soon after starting.
Slowed and stiff movement, a masklike face and tremor.
Inability to sit or stay still, with inner tension.
Repetitive movements of the tongue, mouth or face that may persist, with the risk rising the longer it is used.
Fever, severe stiffness, sweating, confusion and a fast heartbeat: emergency, call 123.
Palpitations or fainting, especially with other drugs or low potassium and magnesium.
The US label notes that the risk of tardive dyskinesia, and the chance that it becomes permanent, rises with the length of treatment and the total dose. To treat acute movement effects the doctor may prescribe drugs that counter them, such as Parkinol, a drug that is sometimes misused, so it is taken only with a prescription and follow-up.
Other side effects of haloperidol
- Dry mouth or increased saliva, and blurred vision.
- Reduced appetite, nausea, and constipation or diarrhea.
- Insomnia, tension or dizziness.
- Dizziness on standing quickly.
- Breast enlargement or milk discharge and menstrual irregularity.
- Sexual dysfunction in men, and difficulty urinating.
Who does haloperidol not suit? And important interactions
- Parkinson's disease: the US National Library of Medicine notes that the doctor will often not prescribe it.
- A history of QT prolongation, heart rhythm disturbance, or low calcium and magnesium.
- Epilepsy, heart and thyroid disease, and bipolar disorder.
- Alcohol: it increases its side effects, as do sedatives.
In pregnancy and breastfeeding the doctor discusses benefit and risk, and the drug is not stopped suddenly on discovering a pregnancy.
Is haloperidol addictive?
Haloperidol does not cause euphoria or addiction, as the guide to whether psychiatric medications cause addiction explains. But stopping it without a plan may bring back psychotic symptoms. It may sometimes be used under medical supervision in managing drug-induced psychosis, but it does not treat addiction itself.
When should you ask for help?
If persistent involuntary movements appear, the patient refuses the medication, or symptoms return despite adherence, early review is essential. In Eradah's psychiatry department, the medication plan is reviewed and movement effects are treated, and the dual diagnosis program follows people who have both psychosis and substance use. The first consultation is free and confidential.