Meclizine (Bonine): What It Is and How It's Used for Motion Sickness

Educational summary · drug class: First-generation (sedating) antihistamine, piperazine class, with anticholinergic activity; antiemetic/antivertigo agent · last reviewed 2026-06-29

Meclizine is a first-generation antihistamine (with anticholinergic activity) used to help prevent the nausea, vomiting, and dizziness of motion sickness. Per the FDA label it has a slower onset and longer action than most antihistamines used for motion sickness, roughly 24 hours, so it is taken about 1 hour before travel. It can still cause drowsiness despite 'less drowsy' branding. Availability (OTC such as Bonine, or Rx such as Antivert) varies by country and product.

Not medical advice. This page is for general educational and informational purposes only. It is not medical advice and is not a substitute for the advice of a qualified healthcare professional. Dizzout is not a medical provider: we are not doctors or pharmacists. The information here is a general summary drawn from sources such as the FDA-approved label and other public health resources, and it may not reflect the most current changes; the official product label is the authoritative source. Whether any medicine is right for you, and how much to take, are individual decisions that depend on your health, age, and other medicines. We do not provide dosing instructions: always read the product label and follow its directions. Talk to your doctor or pharmacist before starting, stopping, or changing any medication, and never disregard or delay professional medical advice because of something you read here. If you think you may have a medical emergency, contact a doctor or your local emergency number immediately.

What it is

Meclizine hydrochloride (meclizine HCl; spelled meclozine in the UK and elsewhere) is a first-generation, sedating antihistamine of the piperazine class that also has anticholinergic properties, used as an antiemetic and antivertigo agent. In the US it is available both over the counter (e.g., Bonine, Dramamine Less Drowsy) and by prescription (e.g., Antivert). Other names include D-Vert, Zentrip, and (internationally) Postafen. In the UK the meclozine brand Sea-Legs has been discontinued. Status and availability vary by country and product.

Availability: Both: OTC (e.g., Bonine, Dramamine Less Drowsy) and Rx (e.g., Antivert) in the US; varies by country and product. Legal status, brand names, and availability vary by country: check what applies where you live.

How it may help with motion sickness

Motion sickness arises when the inner ear's balance organs and the eyes send conflicting signals. The FDA label describes meclizine as an antihistamine with marked protective activity against histamine and only slight blocking action against acetylcholine. By acting on histamine and cholinergic pathways involved in the brain's nausea, vomiting, and balance signaling, it is thought to dampen the nausea, vomiting, and dizziness this sensory conflict produces. It works best when taken before symptoms start.

What is meclizine prescribed for?

Meclizine has two labeled uses: motion sickness and vertigo. In the US, over-the-counter boxes such as Bonine and Dramamine Less Drowsy carry one use on the Drug Facts label: preventing and treating the nausea, vomiting or dizziness of motion sickness. Prescription meclizine tablets, best known by the brand name Antivert, are labeled for vertigo caused by diseases of the vestibular system, the balance organs of the inner ear, in adults.

So the same ingredient, meclizine HCl, sits under two labels. Which one applies depends on why you take it, and the prescription use starts with a doctor finding the cause of the vertigo.

Meclizine for vertigo and dizziness

Meclizine is used for vertigo when a doctor has found an inner ear cause. The prescription label limits that use to vertigo from vestibular disease in adults. The over-the-counter label, Bonine's included, covers motion sickness dizziness only, so using Bonine for vertigo is a question for your doctor, not the box.

Vertigo and dizziness have many causes, and some need different care. The NHS advises seeing a GP about dizziness that will not go away or keeps coming back, or that comes with double vision, numbness or weakness, hearing or speech problems, fainting or headaches.

Meclizine dosage and timing

According to the FDA/DailyMed label and MedlinePlus, the initial dose is generally taken about 1 hour before travel for protection against motion sickness, and may be repeated about every 24 hours for the duration of the journey because of its long action. This is general label timing only. We do not provide dosing instructions: follow the product label or the advice of your doctor or pharmacist.

We don't provide dosing instructions. The exact amount, schedule, and whether it suits you are individual decisions: read the product label and follow its directions, and ask a doctor or pharmacist.

Meclizine side effects

Sources such as the product label commonly list:

Drowsiness
Dry mouth
Tiredness or fatigue
Dizziness
Blurred vision (reported on rare occasions; report it to a doctor)
Headache
Vomiting
Allergic reactions, including anaphylaxis (get emergency help for swelling or trouble breathing)

Who should check with a doctor or pharmacist first

Drowsiness is common; the label warns against driving or operating dangerous machinery until you know how it affects you. 'Less drowsy' branding does not mean drowsiness-free.
Avoid alcohol; it and other CNS depressants (sedatives, sleep aids, opioids, muscle relaxants, anxiety or depression medicines) can add to drowsiness.
Pregnancy: FDA Pregnancy Category B; the label advises use only if clearly necessary. Talk to a clinician first.
Children: the FDA label states use is not recommended in children under 12.
Older adults: MedlinePlus and the Beers Criteria note older adults should usually avoid meclizine, as safer or more effective alternatives exist, due to anticholinergic effects.
Use with care if you have asthma, glaucoma, an enlarged prostate, or urinary or bladder obstruction; consult a clinician first.
Avoid if you have a known allergy to meclizine.
A doctor or pharmacist should review individual suitability and interactions.

Related situation guides

Frequently asked questions

Is Antivert the same as meclizine?

Yes. Antivert is the US prescription brand of meclizine, and the prescription tablets are labeled for vertigo from diseases of the inner ear's balance system in adults. Over the counter, the same ingredient is sold as Bonine and Dramamine Less Drowsy for motion sickness. One drug, two labels: the prescription label is about vertigo, the over-the-counter label is about motion sickness, and a pharmacist can explain which one you have been given.

Is meclizine (Bonine) really less drowsy?

Meclizine has a slower onset and longer action than many older antihistamines, and some products are branded 'less drowsy,' but drowsiness is still a common side effect. The label warns against driving or operating machinery until you know how it affects you.

How far before travel is meclizine taken?

The FDA label and MedlinePlus generally describe taking the first dose about 1 hour before travel, with repeat doses about every 24 hours during a long journey. We don't give dosing instructions: follow the product label or ask your pharmacist.

Can children or older adults take meclizine?

The FDA label says use is not recommended under age 12. For older adults, MedlinePlus and the Beers Criteria note it is often best avoided because of anticholinergic effects. Check with a doctor or pharmacist about suitability.

Is meclizine over the counter (OTC)?

Yes, in the US meclizine is sold both ways: over the counter (Bonine, Dramamine Less Drowsy) and by prescription (Antivert). The OTC boxes are labeled for motion sickness; the prescription tablets are labeled for vertigo. Availability differs by country and product, so confirm locally.

What are the side effects of Bonine?

Bonine's active ingredient is meclizine, so its most commonly reported side effects are the same: drowsiness, dry mouth, tiredness or fatigue, and dizziness, with blurred vision reported on rare occasions. The label warns against driving or operating machinery until you know how it affects you. A pharmacist can advise on interactions with other medications you take.

Is meclizine used during pregnancy?

Meclizine is FDA pregnancy category B, and its label advises use during pregnancy only if clearly necessary. That call belongs with your doctor or midwife: ask before using it.

Can children take meclizine?

The FDA label states meclizine is not recommended for children under 12. For younger children, ask a pediatrician or pharmacist about appropriate alternatives.

What about adults over 65?

Guidance such as the Beers criteria notes older adults should not usually take meclizine because of its anticholinergic effects. A doctor or pharmacist can advise on individual suitability.

What is the meclizine dosage?

We do not give doses. The amount depends on the product and on why you take it: the over-the-counter boxes are labeled for motion sickness, and prescription meclizine for vertigo is dosed by the prescriber. Follow the label or your prescription exactly, and ask a pharmacist if you are unsure. For motion sickness, the labels time the first dose about an hour before travel starts.

Can you take Bonine for vertigo?

Bonine's Drug Facts label covers only the nausea, vomiting or dizziness of motion sickness. Meclizine for vertigo is a prescription use, labeled for vertigo from diseases of the inner ear's balance system in adults, so ask a doctor before using Bonine for vertigo. Vertigo has many causes, and some need different care.

Sources

This page is for general educational and informational purposes only. It is not medical advice and is not a substitute for the advice of a qualified healthcare professional. Dizzout is not a medical provider: we are not doctors or pharmacists. The information here is a general summary drawn from sources such as the FDA-approved label and other public health resources, and it may not reflect the most current changes; the official product label is the authoritative source. Whether any medicine is right for you, and how much to take, are individual decisions that depend on your health, age, and other medicines. We do not provide dosing instructions: always read the product label and follow its directions. Talk to your doctor or pharmacist before starting, stopping, or changing any medication, and never disregard or delay professional medical advice because of something you read here. If you think you may have a medical emergency, contact a doctor or your local emergency number immediately.