The right medicine for throwing up depends on what’s causing it. For a basic stomach bug or food-related nausea, an over-the-counter option like bismuth subsalicylate (the active ingredient in Pepto-Bismol) can help settle things down. For more persistent or severe vomiting, prescription medications that target specific signals in your brain and gut are available. Here’s what works, when, and what to watch out for.
Over-the-Counter Options
Bismuth subsalicylate is the most widely available OTC medicine for nausea and vomiting in adults and teenagers. You’ll find it sold under brand names like Pepto-Bismol, Kaopectate, and Bismatrol. It works by coating the stomach lining and reducing irritation, which helps calm both nausea and the urge to vomit. It also treats heartburn, indigestion, and diarrhea, so if your vomiting comes alongside other stomach symptoms, it pulls double duty.
One important restriction: do not give bismuth subsalicylate to children or teenagers who have the flu, chickenpox, or any other viral infection, or who are recovering from one. It contains a compound related to aspirin, which raises the risk of Reye’s syndrome, a rare but serious condition that causes swelling in the liver and brain. For kids with a viral illness, skip this medication entirely and talk to a pediatrician about alternatives.
Phosphorated carbohydrate solutions (like Emetrol) are another OTC choice. These are flavored sugar-based liquids that work by soothing the stomach muscles directly. They won’t treat the underlying cause of vomiting, but they can take the edge off mild nausea, especially in situations where you just need temporary relief.
Medicine for Motion Sickness
If your vomiting is triggered by car rides, boats, or flights, antihistamines are your best bet. Meclizine (sold as Bonine or Dramamine Less Drowsy) is taken 1 hour before travel at a dose of 25 to 50 milligrams for adults, with one dose lasting a full 24 hours. Dimenhydrinate (original Dramamine) works similarly but tends to cause more drowsiness.
These medications work by blocking signals from the balance system in your inner ear before they reach the part of your brain that triggers vomiting. The key is timing: they’re far more effective when taken before nausea starts rather than after you’re already feeling sick. Meclizine is not recommended for children under 12.
Prescription Medications for Severe Vomiting
When OTC options aren’t enough, doctors can prescribe stronger anti-nausea drugs that work on different chemical pathways in the body. The three main classes each target a different trigger for vomiting.
Serotonin Blockers
Ondansetron (Zofran) is one of the most commonly prescribed anti-vomiting medications. It works by blocking serotonin signals in the gut and the part of the brain that initiates the vomit reflex. It’s widely used after surgery, during chemotherapy, and for severe gastroenteritis. It dissolves on the tongue, which is especially helpful when you can’t keep a pill down. Many people find it effective within 15 to 30 minutes.
Dopamine Blockers
Medications like metoclopramide (Reglan) and prochlorperazine block dopamine signals in the brain’s chemoreceptor trigger zone, a small area that monitors the blood for toxins and tells the brain to initiate vomiting when it detects something wrong. These are often prescribed for nausea related to migraines, stomach conditions, or post-surgical recovery. Metoclopramide also speeds up stomach emptying, which makes it particularly useful when vomiting is caused by food sitting in the stomach too long.
Antihistamine-Based Prescriptions
Promethazine (Phenergan) is a prescription antihistamine that blocks signals from the inner ear and the vomiting center. It’s effective but causes significant drowsiness, which can actually be a benefit if you just need to sleep through a bad bout of stomach illness. It’s available as a tablet, suppository, or injection for people who can’t keep anything down orally.
Medicine for Morning Sickness
Pregnancy-related vomiting has its own first-line treatment: a combination of doxylamine (an antihistamine) and vitamin B6. This is available by prescription under brand names like Bonjesta and Diclegis. The typical starting dose is two delayed-release tablets at bedtime. If nausea persists the next afternoon, the dose gradually increases over a few days, up to a maximum of four tablets daily spread across morning, afternoon, and bedtime.
Many women try vitamin B6 on its own first, since it’s available over the counter and has a good safety profile during pregnancy. If that’s not enough, the prescription combination adds the antihistamine component for stronger nausea control. Both ingredients have decades of safety data in pregnancy.
What to Do Before the Medicine Kicks In
While waiting for medication to work, a few practical steps can prevent things from getting worse. Sip small amounts of clear fluids: water, diluted juice, broth, or an electrolyte drink. Taking large gulps can trigger more vomiting, so aim for a tablespoon every few minutes. Avoid solid food until you’ve kept liquids down for a few hours, then start with bland items like crackers, rice, or toast.
Stay upright or slightly reclined rather than lying flat, which can increase the urge to vomit. If you’re taking an oral medication and throw it up within 15 to 20 minutes, it likely didn’t have time to absorb. In that case, a dissolving tablet or suppository form may work better.
Signs That Vomiting Needs Medical Attention
Most vomiting from stomach bugs or food-related illness resolves within 24 hours. But some situations call for medical care rather than home treatment. Dehydration is the biggest risk, especially in young children and older adults. In infants, fewer than six wet diapers a day is a warning sign. In toddlers, no urination for eight hours signals a problem. Adults should watch for a dry mouth, dark urine, dizziness when standing, or a rapid heartbeat.
Vomiting that contains blood, looks like coffee grounds, or comes with severe abdominal pain, a high fever, or a stiff neck points to something beyond a simple stomach illness. The same goes for vomiting that lasts more than two days in adults or more than 24 hours in children, or any vomiting after a head injury. In these cases, medication alone isn’t the answer, and getting evaluated quickly matters more than choosing the right anti-nausea drug.