You can’t cure a stomach virus with medication. It has to run its course, and most people recover within one to three days. What you can control is how miserable those days are and whether you avoid the main danger: dehydration. The rest of this guide covers exactly what to do (and what not to do) from the moment symptoms hit until you’re fully back to normal.
Why There’s No Quick Fix
A stomach virus, most commonly norovirus, is a viral infection of your gut lining. Antibiotics don’t work on viruses, and no antiviral medication targets norovirus. Your immune system clears it on its own, typically within 24 to 72 hours. Symptoms usually appear 12 to 48 hours after exposure, which means you were likely infected a day or two before you started feeling sick.
In the United States alone, norovirus causes roughly 19 to 21 million illnesses per year. It accounts for about half of all foodborne disease outbreaks and around 18% of acute gastroenteritis cases worldwide. So if it feels like everyone gets this at some point, they do.
Hydration Is the Single Most Important Thing
Vomiting and diarrhea drain fluid and electrolytes fast. For most healthy adults, this is uncomfortable but manageable. For young children, older adults, and people with weakened immune systems, it can become dangerous quickly. Dehydration is the primary reason people end up in the hospital with a stomach virus.
Plain water alone isn’t ideal because it doesn’t replace the sodium and potassium you’re losing. The best approach is an oral rehydration solution, which works by pairing sodium and glucose in a 1:1 ratio. This activates a specific transport system in your intestines that pulls water into your body far more efficiently than water alone. You can buy premade oral rehydration solutions at any pharmacy, or look for drinks that contain both sodium and a small amount of sugar.
Sports drinks are better than nothing but contain more sugar and less sodium than what your body needs right now. If you’re vomiting frequently, take very small sips every few minutes rather than gulping large amounts. Ice chips work well if even sips won’t stay down. As vomiting slows, gradually increase the volume.
Signs of Dehydration to Watch For
In adults, warning signs include very dark urine, urinating far less than usual, dizziness when standing, dry mouth, and a rapid heartbeat. In infants and toddlers, the clearest red flag is no wet diaper for three or more hours. Other signs in children include crying without tears, unusual sleepiness, and a sunken soft spot on the head. If you notice any of these, especially in a child or an elderly person, seek medical attention promptly.
What to Eat (and When)
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, toast. It’s been standard advice for decades, but current guidelines from the National Institute of Diabetes and Digestive and Kidney Diseases no longer recommend it. Research shows that following a restricted diet doesn’t help treat viral gastroenteritis, and it can actually slow recovery by depriving your body of the protein, fat, and calories it needs to heal.
The updated advice is simpler: eat your normal diet as soon as your appetite returns, even if you still have diarrhea. You don’t need to follow a special progression from liquids to bland foods to solids. If certain foods sound appealing and others don’t, go with what feels right. Most people naturally gravitate toward lighter meals at first, and that’s fine.
For infants, continue breast milk or formula as usual. Don’t dilute formula or switch to a special one unless your pediatrician tells you to. For older children, offer their regular foods as soon as they’re willing to eat.
Over-the-Counter Medications
Two common options can provide some symptom relief, though neither shortens the illness itself.
- Anti-diarrheal medications (loperamide): These reduce the frequency of bowel movements and can be helpful when you need to function, travel, or sleep. They’re generally safe for adults with uncomplicated diarrhea. However, avoid them if you have a fever along with diarrhea or if there’s blood in your stool, as these can be signs of a bacterial infection where slowing your gut down could cause harm. For children under six, these medications are rarely recommended.
- Bismuth subsalicylate (the active ingredient in Pepto-Bismol): This can help with nausea and diarrhea. But it’s not appropriate for children under 12 due to a small risk of Reye’s syndrome when used during viral infections. Anyone with an aspirin allergy, kidney problems, or who takes blood thinners should skip it as well.
For nausea and vomiting specifically, there’s no widely recommended over-the-counter option for adults with a stomach virus. Focus on the small, frequent sips of fluid and wait it out. The vomiting phase is usually the shortest part, often resolving within 12 to 24 hours.
Do Probiotics Help?
Probably not, despite what you may have heard. A large Cochrane review of the evidence found no meaningful difference between probiotics and placebo for reducing how long diarrhea lasts or the likelihood of it continuing past 48 hours. Some earlier, smaller studies suggested specific strains like Lactobacillus rhamnosus GG might help children, but a subsequent large, high-quality trial in U.S. children did not confirm the benefit. Some European pediatric guidelines still give a cautious recommendation, but they acknowledge the supporting evidence is low quality.
Taking probiotics won’t hurt, but they’re unlikely to make a noticeable difference in how quickly you recover.
How to Avoid Spreading It
Norovirus is extraordinarily contagious. You can catch it by getting microscopic particles of an infected person’s stool or vomit into your mouth. That sounds hard to do accidentally, but the virus spreads through several surprisingly easy routes: contaminated food handled by a sick person, surfaces touched after using the bathroom, aerosolized droplets that spray into the air during vomiting, and contaminated water. Even a tiny amount of the virus is enough to make someone sick.
If someone in your household is ill, these steps make a real difference:
- Clean up vomit and diarrhea carefully. Wear disposable gloves. Wipe up the material with paper towels first, then disinfect the area.
- Use bleach-based disinfectant on hard surfaces. The CDC recommends a chlorine bleach solution of 5 to 25 tablespoons of standard household bleach (5% to 8% concentration) per gallon of water. Most “antibacterial” sprays and wipes don’t kill norovirus. If you prefer a commercial product, check that it’s EPA-registered specifically against norovirus.
- Wash hands thoroughly with soap and water. Hand sanitizer is not reliable against norovirus. Actual handwashing with friction is what works.
- Wash contaminated laundry on the hottest setting. Handle soiled clothing, towels, and bedding carefully, at arm’s length, and wash them separately from other laundry.
- Don’t prepare food for others while sick. The virus can still be shed in stool for days after you feel better, so ideally wait at least two days after symptoms resolve before cooking for other people.
When Recovery Takes Longer Than Expected
Most people bounce back quickly, but certain groups face higher risk for complications. Young children, adults over 65, and people with compromised immune systems are more likely to become severely dehydrated and may need IV fluids in a medical setting.
Seek medical care if vomiting prevents you from keeping any fluids down for more than 24 hours, if diarrhea lasts longer than three days, if you see blood in your vomit or stool, or if you develop a high fever. In children, the threshold is lower: persistent vomiting for more than a few hours, signs of dehydration, or unusual lethargy all warrant a call to your doctor.
After the worst is over, it’s normal for your digestive system to feel “off” for several days. Loose stools, mild cramping, and reduced appetite can linger for up to a week even as the virus clears. This doesn’t mean you’re still sick. Your gut lining took a hit and needs time to fully repair.