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An antiemetic is a medicine used to prevent or treat nausea and vomiting. Antiemetics work through different pathways in the brain, stomach, inner ear, and nervous system. Some are used for motion sickness, while others are used after surgery, during chemotherapy, or with certain stomach illnesses. The right antiemetic depends on the cause of nausea, age, health history, and other medicines.
read more about antiemetic ...Nausea and vomiting can be triggered by signals from the stomach, brain, inner ear, blood, or digestive tract. Antiemetics block or calm some of those signals. Different medicines target serotonin, dopamine, histamine, acetylcholine, or neurokinin receptors. This is why one antiemetic can work well for motion sickness while another works better for chemotherapy-related nausea.
Antiemetics are used for nausea and vomiting from motion sickness, migraine, stomach infection, pregnancy-related nausea, anesthesia, chemotherapy, radiation therapy, and some medicines. They can also be used when vomiting raises the risk of dehydration. A clinician should guide use for pregnancy, young children, older adults, or people with heart rhythm concerns. Vomiting with blood, severe belly pain, confusion, chest pain, or dehydration needs medical care.
Common antiemetic types include serotonin 5-HT3 antagonists, dopamine antagonists, antihistamines, anticholinergics, and NK1 receptor antagonists. Examples include ondansetron, metoclopramide, prochlorperazine, promethazine, meclizine, dimenhydrinate, scopolamine, and aprepitant. Some cause drowsiness, while others can affect heart rhythm or movement control. Patients should use the medicine chosen for the specific cause of nausea.
Antiemetics can cause drowsiness, dizziness, constipation, dry mouth, headache, or blurred vision. Some can cause serious side effects such as heart rhythm changes, severe restlessness, muscle stiffness, or involuntary movements. Alcohol and sedating medicines can make drowsiness worse. Seek urgent care for fainting, severe allergic reaction, stiff muscles with fever, severe headache after injury, or vomiting that does not stop.
Yes, ondansetron is an antiemetic. It is used to help prevent nausea and vomiting related to surgery, chemotherapy, radiation therapy, and other clinician-directed situations.
No, antiemetics can treat nausea even when vomiting has not happened. Some are used to prevent nausea before a known trigger, such as surgery or motion travel.
Yes, some antiemetics can make you sleepy, especially antihistamine and phenothiazine types. Avoid driving or alcohol until you know how the medicine affects you.
Seek medical care for blood in vomit, severe belly pain, chest pain, confusion, dehydration, high fever, head injury, or vomiting that keeps returning. Infants, older adults, and pregnant patients need extra caution.
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Antiemetic Medications. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK532303/. Date Accessed June 3, 2026.
Ondansetron: MedlinePlus Drug Information. MedlinePlus. https://medlineplus.gov/druginfo/meds/a601209.html. Date Accessed June 3, 2026.
Label: ONDANSETRON tablet, orally disintegrating. DailyMed. https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=cab63f24-8728-4927-aba5-53e8d2e44cdb. Date Accessed June 3, 2026.
Nausea and Vomiting: When to See a Doctor. Mayo Clinic. https://www.mayoclinic.org/symptoms/nausea/basics/when-to-see-doctor/sym-20050736. Date Accessed June 3, 2026.