Several medicines effectively treat nausea, and the best choice depends on what’s causing it. Over-the-counter options like bismuth subsalicylate, antihistamines, and ginger work well for everyday nausea, while prescription medications target more severe causes like chemotherapy or post-surgical vomiting. Here’s what works, organized by the situation you’re most likely dealing with.
Over-the-Counter Options for General Nausea
For garden-variety nausea from an upset stomach, food that didn’t agree with you, or mild illness, a few drugstore options are widely available. Bismuth subsalicylate (the active ingredient in Pepto-Bismol) coats the stomach lining and reduces inflammation. It works for nausea, heartburn, and diarrhea, making it a good first choice when you’re not sure exactly what’s going on with your stomach.
Another option is phosphorated carbohydrate solution, sold under brand names like Emetrol. It contains a simple combination of glucose, fructose, and phosphoric acid that calms stomach contractions. You take a dose every 15 minutes until the nausea passes, up to five doses in an hour. It shouldn’t be diluted or mixed with other fluids, and people with hereditary fructose intolerance should avoid it entirely.
Motion Sickness Medications
If your nausea is triggered by travel, boats, or amusement rides, antihistamines are the standard fix. Meclizine (sold as Bonine or Dramamine Less Drowsy) is the most accessible option and lasts longer than other antihistamines in its class. You take it about two hours before travel. Dimenhydrinate (original Dramamine) is another choice, though it tends to cause more drowsiness.
For stronger protection, scopolamine patches are available by prescription. You apply the patch behind your ear 12 hours before you need it, and it provides continuous relief for up to three days. In head-to-head comparisons, scopolamine outperformed meclizine at preventing nausea during motion exposure. The trade-off is that scopolamine can cause dry mouth and blurred vision, and it requires advance planning since it needs that long lead time to kick in.
Nausea During Pregnancy
Vitamin B6 (pyridoxine) is the recommended first-line treatment for morning sickness. It’s available over the counter and has been found safe for both the pregnant person and the fetus. If B6 alone isn’t enough, doxylamine (an antihistamine found in OTC sleep aids like Unisom SleepTabs) can be added. Both drugs, taken alone or together, have no known harmful effects during pregnancy. A prescription combination of the two is also available for convenience.
These options work for the typical nausea and vomiting that affects up to 80% of pregnancies. Severe, persistent vomiting that leads to dehydration or weight loss is a different condition (hyperemesis gravidarum) that requires medical treatment beyond these first-line approaches.
Prescription Antiemetics for Severe Nausea
When OTC options aren’t enough, prescription antiemetics work by blocking specific chemical signals in the brain that trigger vomiting. The most commonly prescribed is ondansetron (Zofran), which blocks serotonin receptors in the brain’s vomiting center. Standard adult dosing is 8 mg every 12 hours by mouth. A single intravenous dose should not exceed 16 mg because higher amounts carry a risk of heart rhythm problems.
Other prescription classes include:
- Dopamine blockers (like prochlorperazine and metoclopramide), which target dopamine receptors in the brain’s trigger zone for nausea. These can cause drowsiness and, less commonly, involuntary muscle movements, particularly with repeated use.
- NK1 receptor antagonists (like aprepitant), which block a chemical called substance P that directly induces vomiting. These are typically reserved for chemotherapy-related nausea.
Chemotherapy-Related Nausea
Chemotherapy-induced nausea is one of the most challenging types to control because it involves multiple pathways in the body. Treatment is tailored to how likely a specific chemo drug is to cause vomiting. For the highest-risk treatments (like cisplatin), current guidelines from the American Society of Clinical Oncology recommend a four-drug combination: a serotonin blocker, an NK1 blocker, a steroid (dexamethasone), and olanzapine on the day of treatment, with some medications continuing for three additional days to prevent delayed nausea.
Moderate-risk chemo drugs typically call for two or three of those medications, while low-risk treatments may only need a single dose of a serotonin blocker or steroid beforehand. The layered approach matters because chemotherapy triggers nausea through several different chemical pathways simultaneously, and blocking just one often isn’t enough.
Stomach Flu Nausea
Viral gastroenteritis (stomach flu) is one of the most common causes of nausea, and the frustrating reality is that there’s no specific medication to treat the virus itself. Antibiotics don’t work against viruses. The main strategy is staying hydrated and riding it out. Adults can use bismuth subsalicylate to manage symptoms, though it should be avoided if you have a fever or bloody diarrhea, which could signal a bacterial infection rather than a virus.
For children with stomach flu who are vomiting enough to risk dehydration, ondansetron is sometimes used as a single dose. Pediatric dosing is weight-based: children 8 to 15 kg get 2 mg, those 15 to 30 kg get 4 mg, and children over 30 kg get 6 to 8 mg. This is generally recommended for children six months and older. Store-bought anti-diarrheal medications should not be given to children with stomach flu, as they can make it harder for the body to clear the virus.
Ginger as a Natural Alternative
Ginger has genuine clinical evidence behind it, not just folk-remedy status. A daily dose of about 1,000 mg of ginger powder is the most commonly studied amount and has shown effectiveness for pregnancy nausea, motion sickness, and even chemotherapy-related nausea. In a large trial of 576 cancer patients, ginger at doses of 0.5 to 1.0 g per day significantly reduced acute nausea when added on top of standard anti-nausea drugs. Interestingly, the highest dose tested (1.5 g) wasn’t more effective than the lower ones.
For motion sickness, taking 1,000 mg about an hour before travel is the typical approach. For pregnancy nausea, studies have used 500 mg three times daily for three to five days. Look for standardized ginger extract capsules rather than relying on ginger ale or ginger snacks, which contain far less of the active compounds. Products standardized to 5% gingerols (the active ingredient) have been used in clinical trials.
Choosing the Right Medicine
The cause of your nausea is the single biggest factor in choosing a treatment. A quick guide:
- Upset stomach or mild illness: bismuth subsalicylate or phosphorated carbohydrate solution
- Motion sickness: meclizine (OTC) or scopolamine patch (prescription)
- Pregnancy: vitamin B6 first, add doxylamine if needed
- Post-surgery or severe nausea: ondansetron (prescription)
- Chemotherapy: multi-drug regimen prescribed by your oncology team
- Any of the above, as an add-on: ginger (1,000 mg daily)
Antihistamine-based options like meclizine and dimenhydrinate cause drowsiness in most people, which can be a benefit at bedtime but a problem during the day. Ondansetron causes less sedation but carries a small risk of heart rhythm changes at high doses, particularly in people with liver problems, where the maximum daily dose is cut in half. Dopamine-blocking antiemetics tend to be the most sedating and have the highest risk of movement-related side effects with long-term use.