Motion sickness patches: the one that is medicine, and the rest

Because the skin there is hairless, thin and usually left alone, so the patch sticks for days and releases medicine steadily into the bloodstream. The ear itself has nothing to do with it: the medicine travels in the blood to the brain and inner-ear nerve pathways, not through the ear. Herbal patches copy the placement because it is where people expect a motion sickness patch to go.

The US label directs applying the scopolamine patch at least 4 hours before the effect is needed, and it can take up to about 6 hours to work fully. One patch is worn for about 3 days; for a longer trip the label describes removing it and placing a new one behind the other ear. That lead time is the reason the CDC Yellow Book calls transdermal delivery too slow for symptoms that have already started. Follow the leaflet and your prescriber for the exact routine.

In the US, no. The scopolamine patch is prescription-only, and the over-the-counter motion sickness rules cover tablets, not patches. Anything sold as a patch without a prescription in a US store or online is a herbal or device product, not an approved medicine. In the UK the NHS says pharmacies sell patches for adults and children over 10. Our over-the-counter guide lists what each country sells without a prescription.

It is the same patch. Scopolamine does not know whether the motion comes from a car, a ship or a plane. The CDC Yellow Book pairs the patch with longer exposure and moderate to intense motion, which is why it comes up for cruises and sea crossings more than for a short drive. For a car trip or a flight of a few hours, the same guidance points to a tablet taken beforehand, and for a passenger already feeling sick, to drug-free steps.

Dry mouth is the most common. The label also lists drowsiness, blurred vision, a dilated pupil (often in one eye, from touching the patch and then the eye), dizziness, disorientation, constipation and changes in sweating. Confusion or agitation is more likely in older adults and children. After the patch comes off, some people get withdrawal symptoms such as dizziness, nausea and headache, usually starting a day or more later. The FDA has added a warning that the patch can raise body temperature, most often reported in children and in adults over 60.

No. Drowsiness is on the label. The CDC Yellow Book ranks scopolamine as slightly less sedating than dimenhydrinate or meclizine and promethazine as the most sedating, so the patch sits at the less drowsy end of the medicines, not outside them. Do not drive until you know how it affects you, and avoid alcohol while wearing it.

The CDC Yellow Book says scopolamine, including patches, can cause dangerous adverse effects in children and should be avoided. The US label says safety and effectiveness in children are not established, and the UK patch is for ages 10 and over. For a child, this is a pediatrician's decision, and our kids pages are information only.

The US label rules it out for people with angle-closure glaucoma or an allergy to scopolamine or other belladonna alkaloids. The CDC Yellow Book adds people at risk of urinary retention from an enlarged prostate. Older adults have a higher risk of confusion. Anyone pregnant or breastfeeding should ask a clinician first. Tell a pharmacist about your other medicines, because other anticholinergic or sedating drugs add to the effects.

No to both. The CDC Yellow Book says the patch should never be cut in an attempt to vary the dose, and the label describes one patch at a time. Wash your hands after touching it so the medicine does not reach your eyes, and take it off before an MRI.

In the US the scopolamine patch is dispensed by the pharmacy counter with a prescription, including at chain pharmacies. The patches on the open shelf and on marketplace sites are the herbal kind described above. If a listing calls itself a motion sickness patch and needs no prescription in the US, it is not scopolamine.

A patch is the wrong tool for that moment: the CDC Yellow Book says transdermal delivery is too slow once symptoms have begun. Get on deck with your eyes on the horizon, fresh air on your face, head still, phone away. A drug-free option built for use after symptoms start fills the gap: Dizzout plays sound therapy through any headphones and states relief in about 90 seconds, a product claim, not a clinical finding.