Motion sickness: what actually prevents it, which tablet works, and when to take it

The school trip coach, the ferry to France, the taxi across London after a big breakfast: motion sickness turns ordinary journeys into something the whole family dreads. Around one in three people get it regularly, and almost everyone will feel it on a rough enough crossing. At The Online GP by The Wellness, we advise on motion sickness every week, especially before holidays, and the good news is that it is one of the most preventable travel problems there is. The right tablet, taken at the right time, works for most people.

Why motion sickness happens

Your brain coordinates balance using three feeds: your eyes, your inner ear, and the position sensors in your muscles and joints. Motion sickness happens when those feeds disagree. In a car your inner ear feels every turn and bump while your eyes, fixed on a screen or a book, report that nothing is moving. The brain reads that mismatch as a possible poisoning and triggers nausea as a defence. That is why looking out of the window helps and reading makes it worse.

Children between two and twelve are the most susceptible, women more than men, and anyone with migraine is more prone. Most children grow out of it as their balance system matures.

Symptoms beyond nausea

Nausea and vomiting get the attention, but motion sickness usually announces itself earlier: yawning, cold sweats, pale or grey skin, headache, dizziness, burping and a vague feeling of unease. Catching it at that early stage, and acting, works far better than treating established vomiting.

What actually prevents it

Position and habit fixes come first because they are free and genuinely effective:

In the car, sit in the front passenger seat or, for children, a middle rear seat with a clear view forward. On a ship, mid-ship on a lower deck moves least. On a plane, over the wing. Keep the gaze on the horizon or the road ahead, not on a phone or book. Fresh air helps: open a window or point the air vent at the face. Eat lightly before travel; an empty stomach and a very full one both make nausea worse. Avoid alcohol the night before a crossing. Ginger, as tea, biscuits or capsules, has modest evidence behind it and is safe for most adults and children over two.

Acupressure wristbands divide opinion. The trial evidence is weak, but they are harmless and cheap, and some families swear by them. They are reasonable to try for mild cases alongside the measures above.

Which medication works, and when to take it

Two medicines dominate, and timing matters more than most people realise. Both work best taken before the journey, not once symptoms start.

Hyoscine hydrobromide (also called scopolamine) is the most effective option for most adults. Brands such as Kwells are taken 20 to 30 minutes before travel, or Joy-Rides a little earlier; a hyoscine skin patch applied several hours before travel lasts up to 72 hours and suits cruises and long crossings. Side effects are dry mouth, drowsiness and blurred vision. It is not suitable for children under three (Kwells Kids covers older children), or for people with glaucoma, and it interacts with some other medicines.

Antihistamines are the gentler alternative. Cinnarizine (Stugeron) is the usual first choice for adults and children over five, taken two hours before travel. Cyclizine (Valoid) suits adults and children over six. Promethazine (Phenergan, Avomine) works well but is strongly sedating, which makes it better for overnight journeys than for a driver. Older sedating antihistamines outperform newer non-drowsy ones here; cetirizine and loratadine do not work for motion sickness.

If vomiting is already established or severe, a GP can prescribe stronger anti-sickness medication. And if motion sickness is ruining travel for you or your child despite over-the-counter options, a short consultation can sort out a proper plan before the next trip.

Travel health consultations in private London clinics typically run £100 to £250 before any prescription. A phone consultation with The Online GP costs £59 for 15 minutes, video is £150, and in-person at our Marylebone clinic is £220. Book a same-day consultation and travel prepared.

When motion sickness is not motion sickness

Occasionally, what looks like travel sickness deserves a closer look. Recurrent dizziness or nausea without travel, a single severe episode with hearing changes or ringing in one ear, vomiting that continues long after the journey ends, or new motion sickness in an adult who never had it before: all are worth a conversation with a doctor. So is motion sickness in a child under two, which is unusual and should be checked before medicating.

If you are unsure whether symptoms fit the pattern, message us on WhatsApp and we will point you in the right direction.

Frequently asked questions

What is the best tablet for motion sickness?

For most adults, hyoscine hydrobromide (such as Kwells) is the most effective, taken 20 to 30 minutes before travel. Cinnarizine (Stugeron) is the usual first choice for children over five and for adults who prefer a gentler option. A GP can advise on the best fit for your journey and medical history.

Why do children get travel sick more than adults?

The balance system is still developing between ages two and twelve, which makes the sensory mismatch harder for a child's brain to resolve. Most children improve through their teens and many grow out of it entirely.

Can you take motion sickness tablets every day on a cruise?

Hyoscine patches are designed for exactly that, lasting up to 72 hours each. Tablets like cinnarizine can be taken every eight hours as needed throughout a trip. Long daily use should be discussed with a GP or pharmacist, especially for children.

Does looking at the horizon really help?

Yes. It is the single most effective free measure because it lets your eyes confirm the motion your inner ear is reporting, removing the sensory mismatch that triggers nausea. Sitting where you can see forward and keeping your gaze outside beats any wristband.

Is motion sickness medication safe in pregnancy?

Some options are used in pregnancy, but the choice needs a clinician's input. Cyclizine has the longest safety record and is commonly used for pregnancy nausea, while hyoscine is usually avoided. Speak to a GP or midwife before taking anything.

Why do I feel sick in cars but not on planes?

Cars and coaches produce constant small accelerations, braking and cornering at low frequency, which is exactly the motion range the inner ear finds hardest to reconcile. Smooth cruise flight produces little of that motion, which is why many car-sick travellers are fine in the air until turbulence starts.

References

NHS. Motion sickness. nhs.uk, reviewed 2024.

NICE Clinical Knowledge Summary. Motion sickness. NICE, 2023.

Brainard A, Gresham C. Prevention and treatment of motion sickness. American Family Physician, 2014.

Written by The Wellness Team and medically reviewed by The Wellness Clinical Team. This article is for information only and does not replace a consultation. Always read the leaflet before taking any medicine, and check suitability with a pharmacist or GP for children, pregnancy and existing conditions.