Several medicines can help stop or reduce vomiting, and the right choice depends on what’s causing it. For a common stomach bug, bismuth subsalicylate (the active ingredient in Pepto-Bismol) is the most accessible over-the-counter option. For motion sickness, antihistamines like meclizine or dimenhydrinate work well. For more severe or persistent vomiting, prescription medications that block serotonin or dopamine signals in the brain are the most effective tools available.
Over-the-Counter Options
If you’re dealing with vomiting from a stomach virus or something you ate, bismuth subsalicylate is your main OTC option. It’s the active ingredient in brands like Pepto-Bismol and Kaopectate, and it’s FDA-recognized for upset stomach associated with nausea. The typical adult dose is two tablets or two tablespoonfuls of liquid every 30 minutes to one hour as needed. It can temporarily darken your tongue and stool, which is harmless.
You may also see phosphorated carbohydrate solutions (like Emetrol) on pharmacy shelves. These are marketed for nausea from intestinal flu or overeating, but the FDA actually found insufficient evidence for their effectiveness as an antiemetic. They’re considered safe but unproven.
Motion Sickness Medicines
If your vomiting is triggered by travel or movement, antihistamines are the go-to. Meclizine (sold as Bonine or Dramamine Less Drowsy) and dimenhydrinate (original Dramamine) both have FDA approval for motion sickness. These work by blocking histamine receptors involved in your body’s balance and nausea signaling.
Timing matters with these. Meclizine should be taken at least one hour before travel at a dose of 25 to 50 mg, with no more than one dose every 24 hours. Dimenhydrinate needs to be taken 30 to 60 minutes before you travel. Both can cause drowsiness, so plan accordingly if you’re the one driving.
Prescription Medications for Severe Vomiting
When OTC options aren’t enough, prescription antiemetics are significantly more powerful. They fall into a few main categories based on how they work in the brain.
Serotonin blockers are among the most commonly prescribed. This class is widely used for vomiting caused by surgery, chemotherapy, and severe gastroenteritis. They specifically target the nausea and vomiting pathway and tend to cause fewer side effects than older options.
Dopamine blockers work by preventing certain brain cells from activating in a way that triggers the vomit reflex. These are effective for multiple causes of vomiting but can cause side effects like restlessness or drowsiness, so they’re typically reserved for situations where simpler treatments haven’t worked.
Your doctor will choose among these based on the cause of your vomiting, your other medications, and how severe your symptoms are.
Medicines for Morning Sickness
Pregnancy-related nausea and vomiting requires a careful approach since many medications aren’t safe during pregnancy. The first-line treatment recommended by clinical guidelines is vitamin B6, taken at 10 to 25 mg every eight hours. On its own, B6 reliably reduces nausea, though its effect on actual vomiting is less clear.
When B6 alone isn’t enough, adding doxylamine (an antihistamine sold as Unisom SleepTabs, not the gel caps) makes a significant difference. The combination of B6 and doxylamine reduces nausea and vomiting by about 70%. A common approach is a lower dose of doxylamine (12.5 mg) in the morning and at midday, with a larger dose (up to 25 mg) at bedtime, since it causes drowsiness.
Ginger as a Natural Option
Ginger is one of the few natural remedies with solid clinical evidence behind it. In a large trial of 644 cancer patients, ginger supplements at doses of 0.5 to 1.0 grams per day significantly reduced nausea compared to placebo. The patients in that study took ginger capsules twice daily, starting three days before their chemotherapy cycle.
You don’t need to be a cancer patient to benefit. Ginger tea, ginger chews, or capsules can help with garden-variety nausea. The sweet spot appears to be 0.5 to 1.0 grams per day. Higher doses (1.5 grams) didn’t work better in the clinical trial, so more isn’t necessarily more effective here.
What About Children?
Treating vomiting in kids requires more caution than in adults. Many anti-nausea medications commonly used for adults haven’t been well studied in children, and they carry additional risks of side effects and of masking a more serious underlying condition. Antiemetics are generally used cautiously in children older than 2 years, and only when vomiting is severe or won’t stop.
For children with a stomach bug who can’t keep fluids down, a single dose of a prescription serotonin blocker has been shown to be safe and effective. It works by settling things down enough for the child to drink oral rehydration fluids, which can prevent a trip to the emergency room for IV fluids. Typically only one dose is given, because repeated doses can worsen diarrhea.
Warning Signs That Need Medical Attention
Most vomiting resolves on its own or responds to simple treatment, but certain patterns signal something more serious. Green or yellow-green (bilious) vomit can indicate a bowel obstruction and needs urgent evaluation. Vomiting paired with severe lethargy, neck stiffness with fever, or signs of dehydration like no urination for 8 or more hours also warrants immediate care. In infants, a bulging soft spot on the skull combined with inconsolable crying is a red flag. If vomiting persists for more than 24 hours in a child or you notice any of these signs, it’s time to get evaluated rather than continuing to manage symptoms at home.