Cyclizine for Vertigo & Nausea: Uses, Dosage & How It Works
▶ In short — cyclizine
Cyclizine is an antihistamine anti-sickness medicine for nausea, vomiting, vertigo and motion sickness. Cyclizine benefits include its strong effect on vestibular (inner-ear) nausea. It blocks histamine and muscarinic receptors in the brain's vomiting centre, and is especially useful for nausea from inner-ear (vestibular) problems. The usual adult dose is one 50mg tablet up to three times a day (max 150mg/24h). It commonly causes drowsiness — avoid driving and alcohol.
Part of the Access Doctor nausea treatment guide.
What Cyclizine Is Used For
Cyclizine (cyclizine hydrochloride) is an H1 antihistamine with strong anti-sickness (anti-emetic) and anti-vertigo action — one of the most widely prescribed anti-emetics in the UK. It's used for nausea and vomiting from a wide range of causes:
- Vertigo and inner-ear disturbances — BPPV, vestibular neuritis, Ménière's disease;
- Motion sickness — car, boat, plane, train;
- Post-operative nausea (after general anaesthetic);
- Radiotherapy-induced nausea;
- Opioid-related nausea — often prescribed alongside morphine;
- Nausea from other conditions — e.g. raised intracranial pressure, migraine.
How Cyclizine Works
Cyclizine works through two receptor actions plus an effect on the brain's nausea-detection zone:
- Histamine H1 blockade — the vestibular (balance) system uses histamine to signal; blocking it in the brainstem vomiting centre reduces nausea from vertigo and motion.
- Muscarinic (anticholinergic) blockade — adds to the anti-sickness effect (and explains dry mouth, blurred vision and urinary effects).
- Chemoreceptor trigger zone (CTZ) — reduces its sensitivity to chemical nausea triggers.
To understand the mechanism behind cyclizine, read our overview of how antihistamines work for nausea and vertigo.
Why cyclizine, not ondansetron? Cyclizine is best for vestibular and motion-related nausea; ondansetron (a 5-HT3 blocker) is better for chemotherapy- and some post-operative nausea. Your prescriber matches the medicine to the cause.
Cyclizine for Vertigo
Vertigo is a spinning sensation (of you or your surroundings) caused by problems in the inner ear or the brain's balance pathways — distinct from general light-headedness. As a vertigo medication, cyclizine helps the nausea and vomiting that accompany vertigo, and is particularly suited to vestibular causes.
| Type of vertigo | Cause | Key features |
|---|---|---|
| BPPV | Displaced inner-ear crystals | Brief episodes (secs–mins) on head movement; most common |
| Vestibular neuritis | Viral inflammation of the balance nerve | Sudden severe vertigo for days; no hearing loss |
| Ménière's disease | Inner-ear fluid pressure | Attacks with hearing loss, tinnitus, ear fullness |
| Labyrinthitis | Inner-ear infection | Vertigo with hearing loss |
| Central vertigo | Brain (stroke, MS, migraine) | May have other neurological symptoms |
Red flags — seek emergency care if vertigo comes with sudden severe headache, double vision, slurred speech, difficulty swallowing, sudden hearing loss, weakness or numbness, inability to walk, or chest pain. These can indicate a stroke or other serious cause.
Adult Dose & How to Take It
| Situation | Dose | Timing |
|---|---|---|
| Adults — vertigo/nausea | One 50mg tablet, up to 3× daily | As directed by prescriber |
| Adults — motion sickness | One 50mg tablet | 1–2 hours before travel |
| Children 6–12 | 25mg (half a tablet), up to 3× daily | As directed |
| Maximum (adult) | 150mg in 24 hours | Do not exceed |
Don't drive or operate machinery while taking cyclizine — it causes drowsiness. Avoid alcohol (it worsens sedation). Tell your prescriber if you have glaucoma, an enlarged prostate, epilepsy or liver disease, or take other anticholinergic medicines.
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Order Cyclizine Tablets →Side Effects & Safety
The most common side effect is drowsiness; others include dry mouth, blurred vision, urinary retention and headache (typical anticholinergic effects). Most are mild and settle when you stop. Because of the sedation, don't drive or operate machinery, and avoid alcohol. Cyclizine isn't suitable for everyone — a prescriber checks it's appropriate for you.
Cyclizine vs Other Anti-Sickness Medicines
| Medicine | Class | Best for |
|---|---|---|
| Cyclizine | H1 antihistamine + anticholinergic | Vertigo, motion sickness, post-op nausea |
| Prochlorperazine (Stemetil) | Dopamine antagonist | Vertigo, severe nausea |
| Domperidone | Dopamine antagonist (prokinetic) | Nausea + slow gastric emptying; no drowsiness |
| Ondansetron | 5-HT3 antagonist | Post-op, chemotherapy nausea |
| Cinnarizine | H1 antihistamine + calcium channel blocker | Motion sickness, Ménière's |
Frequently Asked Questions
What is cyclizine used for?
Cyclizine is an antihistamine used to prevent and treat nausea, vomiting and dizziness — commonly for motion sickness, vertigo (inner-ear disturbances), nausea after surgery or radiotherapy, opioid-related nausea, and nausea from various other causes.
What is the adult dose of cyclizine?
One 50mg tablet up to three times a day (maximum 150mg in 24 hours). For motion sickness, take one 50mg tablet 1–2 hours before travel. Always follow your prescriber's instructions.
How does cyclizine work?
It blocks histamine H1 and muscarinic receptors in the brain's vomiting centre and acts on the chemoreceptor trigger zone. When the inner ear sends disrupted balance signals (as in vertigo), cyclizine dampens them, reducing nausea and vomiting.
Is cyclizine good for vertigo?
Yes — it's particularly effective for nausea driven by vestibular (inner-ear) causes such as BPPV, vestibular neuritis and Ménière's disease. If vertigo is new, severe or has neurological features, get assessed to find the cause.
What are the side effects of cyclizine?
Most commonly drowsiness; also dry mouth, blurred vision, urinary retention and headache. Don't drive or operate machinery, and avoid alcohol, which increases sedation.
Is cyclizine available over the counter?
Cyclizine 50mg is available from pharmacies without prescription for motion sickness in adults and children over 6. For vertigo, prolonged nausea or treatment-related nausea, a prescriber consultation is recommended.
References
- NICE CKS. Vertigo. 2023. cks.nice.org.uk/topics/vertigo
- NHS. Vertigo. nhs.uk/conditions/vertigo
- Joint Formulary Committee. Cyclizine. British National Formulary. bnf.nice.org.uk/drugs/cyclizine
- NHS. Cyclizine. nhs.uk/medicines/cyclizine
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always follow your prescriber's instructions. If vertigo is new, severe or has neurological features, seek medical assessment. In a medical emergency, call 999.