Kwells vs Sea-Legs: two travel tablets on two different clocks
Short answer: different drugs, different clocks, and today different countries. Kwells is hyoscine hydrobromide 300 micrograms, a UK pharmacy tablet. Its label says to take it up to 30 minutes before the start of the journey, or at the onset of nausea, with a repeat every 6 hours if required. Sea-Legs is meclozine hydrochloride 12.5 mg. Its pack says to take it the previous night or an hour before travelling, for 24-hour prevention. The UK Sea-Legs tablet was discontinued in 2014, and the brand is now sold in New Zealand. Both can cause drowsiness. Which one, if either, suits you is a question for a pharmacist, and the pack you are holding is the final word.
Key facts
- Kwells is hyoscine hydrobromide 300 micrograms, an anticholinergic, and Sea-Legs is meclozine hydrochloride 12.5 mg, a sedating antihistamine.
- The Kwells label says to take it up to 30 minutes before the start of the journey, or at the onset of nausea, with a repeat every 6 hours if required.
- The New Zealand Sea-Legs pack says to take it the previous night or an hour before travelling, for 24-hour prevention.
- Kwells is a UK pharmacy medicine, while the UK Sea-Legs tablet was discontinued in November 2014, per the NHS Dictionary of medicines and devices.
- The Kwells 300 microgram tablet lists doses for adults and children over 10, and the Sea-Legs pack covers adults and children from 6.
Kwells and Sea-Legs were both once sold from UK pharmacies for travel sickness. Kwells still is. Sea-Legs was discontinued in the UK in 2014 and is now sold in New Zealand.
This page sets out the label facts for both: the active ingredient, the timing each label gives, the repeat interval, the ages and the drowsiness wording. It does not tell you which to take. That is a question for a pharmacist, and the pack in your hand is what you follow.
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Kwells vs Sea-Legs, label by label
| Feature | Kwells | Sea-Legs |
|---|---|---|
| Active ingredient | Hyoscine hydrobromide 300 micrograms | Meclozine hydrochloride 12.5 mg |
| Drug family | Anticholinergic | Sedating antihistamine |
| Where it is sold | UK pharmacies | New Zealand pharmacies; the UK tablet was discontinued in 2014 |
| Label timing | Up to 30 minutes before the journey, or at the onset of nausea | The previous night, or an hour before travelling |
| Repeat interval | Every 6 hours if required, with a 24-hour maximum | One dose covers up to 24 hours |
| Drowsiness and driving | Drowsiness commonly reported; do not drive if affected | May cause drowsiness; no driving within 8 hours |
| Youngest age on the label | Over 10 (300 microgram tablet) | 6, at a lower amount |
Two ingredients on two different clocks
Kwells contains hyoscine hydrobromide 300 micrograms, an anticholinergic. Its label says to take a tablet up to 30 minutes before the start of the journey, or at the onset of nausea, and the tablets can be sucked, chewed or swallowed. Repeats run 6 hours apart if required, with a stated maximum in 24 hours, and the 300 microgram tablet lists doses for adults and children over 10.
Sea-Legs contains meclozine hydrochloride 12.5 mg, a sedating antihistamine. The New Zealand pack says to take it the previous night or an hour before travelling, and describes the cover as 24-hour prevention. It gives adults and children over 12 one amount and children 6 to 12 a lower one, and it says not to give it to children under 6.
Where each one is sold
Kwells is a UK pharmacy medicine, marketed by Dexcel Pharma. Sea-Legs is no longer sold in the UK: the NHS Dictionary of medicines and devices lists the UK Sea-Legs 12.5 mg tablet as discontinued, with a discontinued date of 5 November 2014, and Ireland's medicines regulator lists it as withdrawn in 2019. In New Zealand, Sea-Legs is a current product, and meclozine can be bought there over the counter from a pharmacy.
The same brand name can carry different directions in different countries, so the pack in your hand outranks any page, this one included. Meclozine is the international spelling of meclizine, which is sold in the United States as Bonine.
Drowsiness, driving and the caution lists
Neither tablet is non-drowsy. The Kwells label lists drowsiness, dizziness, sedation and somnolence as commonly reported, says not to drive or operate machinery if affected, and notes that alcohol may strengthen the sedation. The Sea-Legs pack says it may cause drowsiness, to avoid driving or operating machinery within 8 hours of taking it, and to avoid alcohol.
The Kwells label rules it out with glaucoma, prostatic enlargement, paralytic ileus, pyloric stenosis or myasthenia gravis. The Sea-Legs pack says not to take it during pregnancy without medical advice. Children's ages, older age and other sedating medicines change the answer for both, so bring the pack and your list of medicines to a pharmacist.
When to use which
From the labels, Kwells is the short-notice tablet: up to 30 minutes before the journey, or once nausea starts, with repeats 6 hours apart. Sea-Legs is the plan-ahead tablet: the previous night or an hour ahead, with one dose covering up to 24 hours. Where you are buying settles part of it, because Sea-Legs was discontinued in the UK in 2014. Glaucoma rules out Kwells, both can make you drowsy, and pregnancy, children's ages and other medicines change the answer, so ask a pharmacist and follow the pack.
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Frequently asked questions
Is Kwells the same as Sea-Legs?
No. Kwells is hyoscine hydrobromide, an anticholinergic, and Sea-Legs is meclozine, a sedating antihistamine. Their labels run on different clocks too: Kwells up to 30 minutes before the journey, or at the onset of nausea, with repeats 6 hours apart, and Sea-Legs the previous night or an hour ahead, for 24-hour prevention per its pack.
Which is better for a long ferry crossing, Kwells or Sea-Legs?
Neither label ranks itself against the other. The Sea-Legs pack is written around one dose that covers up to 24 hours, taken the previous night or an hour ahead, while the Kwells label allows a repeat every 6 hours with a 24-hour maximum. Of the two, only Kwells is still sold in the UK, since Sea-Legs was discontinued there in 2014. A pharmacist can match either label to your crossing and your health.
Which makes you less drowsy, Kwells or Sea-Legs?
Neither is non-drowsy, and the labels do not rank them. The Kwells label lists drowsiness, dizziness, sedation and somnolence as commonly reported and says not to drive or operate machinery if affected. The Sea-Legs pack says it may cause drowsiness and to avoid driving or operating machinery within 8 hours of a dose. Reactions vary from person to person, so ask a pharmacist if you need to stay alert at the destination.
Kwells versus Sea-Legs comes down to the clock and the country: up to half an hour before the journey or the night before it, and a tablet still sold in the UK against one now sold in New Zealand. Let a pharmacist check the fit against your health and your other medicines, and read the pack you are holding.
Related comparisons
- Kwells: the full label facts
- Sea-Legs tablets: the full label facts
- Motion sickness medicine names by country
- Hyoscine hydrobromide, the ingredient behind Kwells
- All motion sickness comparisons
Where these facts come from
- Kwells 300 microgram tablets, Summary of Product Characteristics (emc)
- Sea-Legs, official product page (New Zealand)
- Healthify NZ, Meclozine
- Sea-Legs 12.5mg tablets, discontinued UK pack, NHS Dictionary of medicines and devices (dm+d)
- Sea-Legs Tablets, withdrawn medicine record, Health Products Regulatory Authority (Ireland)
Active ingredients and label warnings were re-read at these sources in October 2026. Labels and formulations change, and they differ by country, so the box in your hand is the final word.
This page is informational and not a substitute for professional medical advice; talk to your doctor or pharmacist and follow the product label. Kwells, Sea-Legs and other product and brand names are trademarks of their respective owners; Dizzout is not affiliated with or endorsed by them.