Types of nausea medicine: what to know

Antiemetic medicines reduce the signals that trigger nausea and vomiting, but different medicines act on different chemical pathways. Some are used for motion-related nausea or inner-ear problems; others may be selected when stomach irritation, infection or another illness is involved. A medicine that helps one cause may be unsuitable for another and can cause drowsiness, constipation, dry mouth or other effects. Nausea can accompany acid reflux, food poisoning, gallstones, gastritis, gastroenteritis, heat exhaustion, hepatitis A or low blood sugar, so treating the cause matters.

Tell a pharmacist or clinician when nausea began, whether you are vomiting, what you can drink, and which medicines or supplements you take. Mention pregnancy, breastfeeding, liver or kidney problems and heart-rhythm concerns before using an antiemetic. Take only the recommended product and dose; avoid sharing prescribed medicine or combining products with similar ingredients. Sip fluids regularly and choose bland foods as tolerated. If nausea follows heat exposure, move to a cool place and seek advice if you do not improve.

Seek urgent care for severe or persistent abdominal pain, blood or green material in vomit, confusion, fainting, a stiff neck, chest pain or signs of severe dehydration. Get prompt advice if you cannot keep fluids down, nausea follows a head injury, or you have diabetes and possible low blood sugar. Children, older adults and pregnant people may need earlier assessment.

Ask what may be causing the nausea, whether medicine is appropriate, which side effects to watch for, how long to use it, and when testing or review is needed.