Several medicines treat nausea and vomiting effectively, but the best choice depends on what’s causing your symptoms. Over-the-counter options like bismuth subsalicylate (Pepto-Bismol) and antihistamines (Dramamine) handle most everyday cases, while prescription medications target more severe or persistent nausea from surgery, chemotherapy, or pregnancy.
Over-the-Counter Options
For most people dealing with a stomach bug, mild food poisoning, or motion sickness, an OTC medicine is the logical starting point. The two main categories work in completely different ways.
Bismuth subsalicylate (sold as Pepto-Bismol and Kaopectate) works by coating and protecting the stomach lining. It’s best suited for nausea from gastroenteritis (stomach flu), general stomach upset, and diarrhea. One important caution: bismuth subsalicylate is a salicylate, the same family as aspirin. Children 12 and under should not take it, and neither should children or teenagers who might have the flu or chickenpox. Salicylate use in those situations is linked to Reye syndrome, a rare but life-threatening condition that can cause brain damage. Adults who are allergic to aspirin should also avoid it.
Antihistamines are the go-to for motion sickness. Dimenhydrinate (Dramamine) and meclizine (Dramamine Less Drowsy) work by dulling the inner ear’s ability to sense motion and blocking signals to the brain’s vomiting center. The key with these is timing: they work best when taken before nausea starts. Meclizine is typically taken at 25 to 50 mg about one hour before travel, and a single dose lasts up to 24 hours. Drowsiness is the most common side effect, though meclizine tends to cause less of it than dimenhydrinate.
Prescription Medications
When OTC options aren’t enough, or when nausea stems from something more intense like chemotherapy, surgery, or a chronic condition, doctors turn to stronger prescription antiemetics. These fall into a few major classes, each targeting different chemical signals in the body.
Serotonin Blockers
Ondansetron (Zofran) is probably the most widely prescribed anti-nausea medication in hospitals and clinics. It works by blocking serotonin receptors in both the gut and the brain’s vomiting center. Originally developed for chemotherapy patients, it’s now commonly used for post-surgical nausea, severe stomach flu, and other causes. It’s effective and generally well tolerated, which is why many people recognize it as the dissolving tablet placed under the tongue in emergency rooms.
Dopamine Blockers
Metoclopramide and prochlorperazine block dopamine receptors in a part of the brain called the chemoreceptor trigger zone, which acts as a gatekeeper for the vomiting reflex. Metoclopramide also speeds up stomach emptying, making it useful when nausea is tied to slow digestion. These medications can cause restlessness or involuntary muscle movements, particularly with prolonged use, so they’re typically reserved for short-term situations.
Neurokinin Blockers
Aprepitant and related drugs block a chemical messenger called substance P, which is a potent trigger of vomiting. These are primarily used alongside other anti-nausea drugs during chemotherapy to prevent the delayed nausea that can hit a day or two after treatment.
Motion Sickness: A New Option
In late 2025, the FDA approved tradipitant (brand name Nereus), the first new motion sickness drug in over 40 years. It blocks the same neurokinin receptors used in chemotherapy support, but it’s specifically approved for preventing motion-induced vomiting in adults. In clinical trials, it cut vomiting rates by 50 to 70% compared to placebo, without the drowsiness that antihistamines cause. It’s a prescription medication, so it’s not a replacement for Dramamine on a quick trip, but it’s a meaningful alternative for people who travel frequently or respond poorly to antihistamines.
Medicines for Pregnancy Nausea
Morning sickness requires special consideration because many standard anti-nausea drugs aren’t safe during pregnancy. The first-line treatments are vitamin B6 (pyridoxine) and doxylamine (the active ingredient in Unisom SleepTabs), often used together. Ginger supplements are also a well-studied option. In clinical trials, 1,000 mg of ginger daily (split into two or more doses) performed as well as dimenhydrinate for pregnancy nausea, with fewer side effects. Multiple studies also found ginger equivalent to vitamin B6 for reducing nausea symptoms. If these approaches aren’t enough, doctors can prescribe stronger antiemetics, but the vitamin B6 plus doxylamine combination remains the standard starting point.
Ginger as a Non-Drug Option
Ginger isn’t just a folk remedy. It has genuine clinical evidence behind it, particularly for pregnancy-related and chemotherapy-related nausea. The effective dose in studies ranges from about 500 mg to 1,000 mg per day of ginger powder or extract, typically split across two to four doses. You can get this through capsules, ginger tea brewed from fresh root, or ginger chews, though capsules offer more consistent dosing. Ginger appears to work by calming stomach contractions and reducing inflammation in the digestive tract. It won’t replace ondansetron for severe post-surgical nausea, but for mild to moderate symptoms, it’s a reasonable first step with very few side effects.
Managing Stomach Flu Without Medication
Sometimes the best approach to nausea from a stomach virus involves no medicine at all, at least initially. Letting your stomach rest by pausing solid food for a few hours can help more than immediately reaching for a pill. Start with ice chips or small sips of water, then gradually introduce bland foods like crackers, plain rice, bananas, broth, and oats. Avoid caffeine, alcohol, nicotine, and greasy or heavily seasoned foods until the nausea fully passes. If you’re still vomiting after 24 hours or can’t keep any fluids down, that’s when medication and medical attention become more important, because dehydration is the real danger with prolonged vomiting.
How to Choose the Right One
The cause of your nausea largely determines which medicine will work best:
- Stomach flu or food poisoning: Bismuth subsalicylate for mild cases, ondansetron (if prescribed) for more severe vomiting.
- Motion sickness: Meclizine or dimenhydrinate taken before travel. Tradipitant (Nereus) by prescription for people who need a non-drowsy alternative.
- Pregnancy: Vitamin B6, doxylamine, and ginger as first options.
- Post-surgery or chemotherapy: Ondansetron, often combined with other prescription antiemetics.
- General mild nausea: Ginger supplements or bismuth subsalicylate.
Most anti-nausea medicines work better as prevention than as treatment once vomiting has already started. If you know a trigger is coming, whether it’s a boat ride, a chemotherapy session, or a car trip, taking medication ahead of time gives it a chance to block the signals before they reach your brain’s vomiting center.