If you can’t keep water down, the most important thing to do right now is stop trying to drink normal amounts. Wait 15 to 30 minutes after your last episode of vomiting, then start with tiny sips, about a teaspoon at a time, every one to two minutes. Drinking too much too fast is the most common reason fluids come right back up. Your stomach needs a slow, patient reintroduction.
The Small-Sips Method
The standard approach to rehydration after vomiting is small quantities at frequent intervals. Five milliliters (about one teaspoon) every one to two minutes is generally well tolerated, even by children. That feels painfully slow when you’re thirsty, but it works because your stomach can absorb small volumes without triggering the vomit reflex. Gulping down half a glass will almost certainly come back up.
After 15 to 20 minutes of successful small sips, you can gradually increase the volume. Move to a tablespoon every few minutes, then to small, steady drinks over the next hour or two. If vomiting returns at any point, reset the clock: wait again, then restart with teaspoon-sized sips.
What to Drink Instead of Plain Water
Plain water isn’t always the best choice when you’re vomiting repeatedly. It replaces fluid but not the sodium, potassium, and sugar your body is losing. An oral rehydration solution (ORS) is specifically designed for this situation. These products contain a balanced ratio of glucose and sodium that helps your intestines pull water into your bloodstream more efficiently than water alone. Look for products with reduced osmolarity (the WHO-recommended formulation) at any pharmacy. Pedialyte is one common option; store-brand versions work just as well.
If you don’t have an ORS on hand, try ice chips. Letting ice melt slowly in your mouth delivers fluid in naturally small amounts, making it easier on your stomach. Cold fluids may also help reduce nausea by influencing the body’s pain-relief and mood-related pathways. Sucking on ice popsicles works the same way and adds a small amount of sugar. Flat ginger ale or diluted apple juice are other options, though they lack the ideal electrolyte balance of a true ORS.
Why You Can’t Keep Fluids Down
The most common cause of short-term vomiting is viral gastroenteritis, often called a stomach bug. Viruses like norovirus and rotavirus inflame the lining of your digestive tract, and your body responds by emptying your stomach. Bacterial infections from contaminated food (Salmonella, Campylobacter, or Shigella) cause the same reaction. In most of these cases, the vomiting phase is intense but relatively short, usually lasting 12 to 48 hours.
Other causes are worth knowing about because some require medical attention. Appendicitis typically starts with a dull pain around the belly button that moves to the lower right side, along with nausea and vomiting. A blockage in the digestive tract causes vomiting that often starts suddenly and without nausea. You might notice bile (yellow-green fluid) or partially digested food coming up. Pregnancy, migraines, concussions, and certain medications can also make it impossible to keep fluids down.
When Children Can’t Keep Fluids Down
Children dehydrate faster than adults because their bodies have a higher water turnover relative to their size. The teaspoon method is especially important here: five milliliters every one to two minutes, aiming for 50 to 100 milliliters per kilogram of body weight over three to four hours. For a 22-pound (10 kg) toddler, that works out to roughly 2 to 3.5 cups over the course of an afternoon.
After each episode of vomiting or diarrhea, children under two need an extra 50 to 100 milliliters of fluid (about 2 to 3 ounces) to replace what was lost. Use an oral rehydration solution rather than juice, sports drinks, or water. A medicine syringe can help you control the volume for babies and toddlers who won’t sip from a cup.
If a child’s vomiting is persistent enough that even the small-sips approach fails, a doctor may prescribe a single dose of an anti-nausea medication. Weight-based dosing is used: children between about 18 and 33 pounds typically receive 2 mg, those between 33 and 66 pounds receive 4 mg, and larger children receive 8 mg. This medication is not recommended for infants under six months. A single dose is often enough to break the vomiting cycle so oral rehydration can begin.
Signs You Need Emergency Care
Most vomiting runs its course. But the inability to keep any fluids down becomes dangerous when dehydration sets in. Watch for these warning signs:
- No urination for eight or more hours in adults, or no wet diapers for three hours in infants
- Rapid heart rate even while resting
- Confusion, irritability, or unusual sleepiness
- Dizziness or fainting when standing
- Lack of sweating despite feeling hot
- Bloody or black stool
- Fever above 102°F (39°C)
Moderate to severe dehydration requires IV fluids, which means a trip to urgent care or the emergency room. If you’ve been unable to keep down even small sips for more than 12 hours (or less for young children and older adults), that’s reason enough to seek medical help. Severe dehydration can cause seizures, organ damage, and loss of consciousness. Don’t wait for those symptoms to appear.
Over-the-Counter Options for Adults
Several non-prescription medications can help reduce nausea and vomiting in adults. Antihistamines like promethazine and cyclizine calm the brain’s vomiting center and are available without a prescription in many countries. Motion sickness medications containing hyoscine work through a similar pathway. Some combination products pair a stomach-settling agent with a pain reliever for virus-related nausea.
These medications work best when you can actually keep a pill down. If you’re vomiting so frequently that oral medication won’t stay in your stomach, try a dissolvable tablet or suppository form. Some anti-nausea medications are also available as patches worn behind the ear. If nothing stays down and you can’t access an alternative form, that’s another clear signal it’s time for professional help, where IV medication and fluids can bypass your stomach entirely.
What to Eat After the Vomiting Stops
Once you’ve kept fluids down for several hours, you can start reintroducing food. Begin with bland, easy-to-digest options: plain crackers, white toast, rice, or bananas. Avoid dairy, fatty foods, spicy dishes, and caffeine for at least 24 hours after your last episode of vomiting. These can re-irritate your stomach lining and restart the cycle.
Eat small portions. Your stomach has been through a lot, and a full meal is likely to trigger nausea again. Think of the same principle that worked for fluids: small amounts, frequently, giving your digestive system time to prove it’s ready for more.