Prochlorperazine
Is It Right for You?
A complete guide to Prochlorperazine — what it treats, how it works, dosages, side effects, and when a clinician may prescribe it following an online consultation.
What Is Prochlorperazine?
Prochlorperazine is a first-generation antipsychotic belonging to the phenothiazine class. It is used primarily at low doses as an antiemetic (anti-nausea and vomiting medication) and for the treatment of vertigo and labyrinthine disorders. At higher doses, it has antipsychotic properties used in the management of schizophrenia and related conditions, though this use has become less common with the advent of newer antipsychotics.
In the UK, prochlorperazine is widely recognised and prescribed for the short-term relief of nausea, vomiting, and dizziness associated with conditions such as labyrinthitis, Ménière's disease, and migraine. It is available in tablet form, as buccal tablets that dissolve between the gum and cheek (Buccastem), and as suppositories, offering flexible options particularly for patients who are actively vomiting.
Prochlorperazine is a prescription-only medication in the UK. A licensed clinician must assess your symptoms and medical history before it can be prescribed — which can now be done quickly and conveniently through a telehealth consultation.
What Conditions Is Prochlorperazine Used For?
Prochlorperazine is prescribed for a range of conditions:
including acute nausea, postoperative nausea, chemotherapy-induced nausea, and severe nausea associated with migraine.
including labyrinthitis, vestibular neuritis, and Ménière's disease.
effective adjunct therapy for managing nausea during acute migraine attacks.
occasionally prescribed for short-term management of anxiety in adults, though this is a less common indication.
at higher doses, used in the management of schizophrenia and other psychotic disorders, though second-generation antipsychotics are now generally preferred.
Prochlorperazine used for nausea and vertigo is typically prescribed for short-term use. Long-term use increases the risk of movement-related side effects, including tardive dyskinesia. Always use the lowest effective dose for the shortest duration necessary.
How Does Prochlorperazine Work?
Prochlorperazine exerts its antiemetic and antipsychotic effects primarily through antagonism of dopamine D2 receptors. As an antiemetic, it blocks D2 receptors in the chemoreceptor trigger zone (CTZ) of the area postrema — a region of the brain that detects nauseating stimuli in the bloodstream and initiates the vomiting reflex. By blocking these receptors, prochlorperazine suppresses nausea and vomiting.
In the vestibular system, prochlorperazine reduces the hypersensitive signalling that underlies vertigo and motion-related dizziness. For its antipsychotic effects at higher doses, it blocks dopamine D2 receptors in mesolimbic and mesocortical pathways, reducing the positive symptoms of psychosis such as hallucinations and delusions.
Prochlorperazine also has antihistaminic, anticholinergic, and alpha-adrenergic blocking properties, which contribute to both its therapeutic effects and its side-effect profile, including sedation and postural hypotension.
Dosages & Administration
The correct dose depends on the type and severity of infection, age, weight, and kidney function. Always follow your clinician's instructions. The table below is for general reference only.
Administration Tips
Buccal tablets (Buccastem) should be placed between the gum and cheek and left to dissolve slowly. Do not chew or swallow whole. This route is particularly useful when nausea prevents swallowing oral tablets.
Take oral tablets with water, with or without food.
Avoid alcohol during treatment — prochlorperazine enhances the sedative effects of alcohol.
Do not drive or operate machinery until you know how prochlorperazine affects you. Dizziness and sedation are common, particularly when treatment is first started.
Use the lowest effective dose for the shortest time necessary when treating nausea and vertigo, to minimise the risk of movement-related side effects.
Side Effects of Prochlorperazine
Prochlorperazine is generally effective and tolerable at low antiemetic doses. Side effects are more common and significant at higher antipsychotic doses.
- Drowsiness or sedation
- Dry mouth
- Constipation
- Blurred vision
- Dizziness or postural hypotension
- Restlessness (akathisia)
- Mild extrapyramidal effects (tremor, stiffness)
- Acute dystonia — sudden, involuntary muscle contractions, particularly of the face, neck, or tongue; more common in young adults and children
- Tardive dyskinesia — involuntary repetitive movements, typically of the face and tongue; associated with prolonged use
- Neuroleptic malignant syndrome (NMS) — fever, severe muscle rigidity, altered consciousness, autonomic instability; a medical emergency
- QT prolongation and cardiac arrhythmias — particularly in combination with other QT-prolonging drugs
- Agranulocytosis — rare but serious reduction in white blood cell count; presents with unexplained fever and sore throat
Prochlorperazine can cause movement-related side effects including acute dystonia, parkinsonism, akathisia (inner restlessness), and with long-term use, tardive dyskinesia. These risks are greatest in elderly patients and with high or prolonged doses. If you experience unusual or involuntary movements, contact your clinician promptly.
Drug Interactions
Always disclose all prescription drugs, over-the-counter medicines, vitamins, and supplements to your clinician or pharmacist before starting prochlorperazine.
Concurrent use significantly increases the risk of dangerous cardiac arrhythmias including Torsades de Pointes. Avoid combination or use with extreme caution under specialist supervision.
Additive central nervous system depression can cause profound sedation, respiratory depression, and loss of consciousness.
Additive dopamine blockade increases the risk of extrapyramidal side effects and QT prolongation.
Additive anticholinergic effects including dry mouth, urinary retention, constipation, and confusion, particularly in elderly patients.
Important Warnings
NMS is a rare but potentially fatal reaction to antipsychotic medications including prochlorperazine. Symptoms include high fever, severe muscle rigidity, altered consciousness, and autonomic instability. If suspected, stop prochlorperazine immediately and seek emergency medical attention.
Acute dystonia — sudden, painful muscle spasms typically affecting the neck, face, or tongue — can occur, especially in young adults and with higher doses. This requires prompt medical attention and is treated with anticholinergic medication such as procyclidine.
Prochlorperazine should be used with extreme caution in elderly patients. It increases the risk of falls, sedation, extrapyramidal side effects, and — in those with dementia — has been associated with increased risk of stroke and death. It is not recommended for dementia-related behavioural symptoms.
Prochlorperazine is contraindicated in Parkinson's disease. Its dopamine-blocking effects will significantly worsen Parkinsonian symptoms.
Speak to a Clinician About Treatment
Getting advice no longer means sitting in a waiting room. Through The GP Service, you can consult with a licensed clinician in minutes — from home, on your lunch break, or wherever works for you. If treatment is clinically appropriate, your clinician can issue a prescription during the consultation. A consultation does not guarantee a prescription.
The treatment you need, when you need it.
Prochlorperazine FAQs
Prochlorperazine acts relatively quickly. Most patients begin to experience relief from nausea and vertigo within 20 to 30 minutes of an oral dose, with peak effects within 1 to 2 hours. Buccal tablets (Buccastem) are absorbed through the gum lining and are a useful alternative when nausea makes swallowing difficult.
Prochlorperazine is not typically recommended as a first-line treatment for travel sickness. Antihistamines such as cinnarizine or promethazine are generally preferred for this purpose. Your clinician can advise on the most appropriate option.
When used for nausea and vertigo, prochlorperazine is intended for short-term use only — typically a few days to a couple of weeks. Prolonged use significantly increases the risk of tardive dyskinesia and other movement disorders. Always follow your clinician's guidance on duration.
Prochlorperazine carries significant risks in elderly patients, including increased falls, sedation, and extrapyramidal side effects. It is generally used with caution and at the lowest effective dose in this group. Alternative antiemetics may be more appropriate; your clinician will advise.
Prochlorperazine is generally not recommended for children under 12 years due to the increased risk of dystonic reactions. It may be used in older children under specialist guidance.
Contact your clinician immediately if you experience sudden, involuntary muscle contractions particularly of the face, neck, or tongue. This is an acute dystonic reaction requiring prompt treatment with an anticholinergic medication.
Weight gain is less commonly associated with prochlorperazine at low antiemetic doses than with antipsychotic doses used for schizophrenia. However, some patients may experience increased appetite and mild weight gain over time