You can’t cure the stomach flu, but you can manage it well enough to feel significantly better within one to three days. Viral gastroenteritis has no specific medical treatment because antibiotics don’t work against viruses. Your body has to fight it off on its own, and the real goal is to stay hydrated, control symptoms, and avoid making things worse while it does.
Most cases are caused by norovirus or rotavirus. Symptoms typically start about two days after exposure, and the worst of the vomiting and watery diarrhea lasts three to eight days. Here’s how to get through it.
Hydration Is the Single Most Important Step
The biggest danger from stomach flu isn’t the virus itself. It’s dehydration from all the fluid you’re losing through vomiting and diarrhea. Replacing that fluid is your top priority from the moment symptoms start.
Start with small sips of water or ice chips rather than gulping down a full glass, which can trigger more vomiting. Once you can keep small amounts down, expand to clear broths, caffeine-free sports drinks, or diluted juice. Water alone won’t fully replace what you’re losing. You need something that replenishes electrolytes and a small amount of sugar, which helps your intestines absorb fluid more efficiently. Oral rehydration solutions (sold at any pharmacy without a prescription) are designed specifically for this and work well for both adults and children.
Drink small amounts frequently throughout the day rather than large volumes at once. If you’re caring for a child, keep track of how much they’re drinking and how often they urinate so you can spot dehydration early.
What and When to Eat
Let your stomach settle first. For the first several hours after vomiting starts, skip solid food entirely and focus only on fluids. Once the vomiting slows down and you feel ready to try eating, start with bland, easy-to-digest foods: bananas, white rice, applesauce, white toast, plain oatmeal, mashed potatoes without the skin, or simple noodles with broth. These foods help solidify stools without irritating your stomach further.
Cold foods can be especially helpful if nausea is still lingering, since they don’t produce strong odors that can trigger another wave. Cold applesauce, canned peaches, or plain yogurt are all good options. If nausea returns after eating, stop and go back to liquids for a while before trying again.
Avoid caffeine, alcohol, nicotine, dairy (other than yogurt), fatty foods, and anything heavily seasoned until you’re clearly on the mend. Sugary foods like ice cream, candy, and regular soda can actually make diarrhea worse, so skip those too. Once bland foods are sitting well, gradually reintroduce your normal diet over a day or two. The BRAT approach (bananas, rice, applesauce, toast) is a helpful starting point, but it’s not nutritionally complete, so don’t stick with it for more than a couple of days.
If you’re breastfeeding or formula-feeding an infant, continue as usual. Don’t switch formulas or stop nursing.
Over-the-Counter Medications That Help
Adults can use loperamide (Imodium) to slow diarrhea or bismuth subsalicylate (Pepto-Bismol) to calm the stomach. These won’t shorten the illness, but they can make the worst hours more bearable, especially if you need to sleep or travel.
There are two important exceptions. Don’t use these medications if you have a fever or bloody diarrhea, because those symptoms suggest a bacterial or parasitic infection rather than a simple virus, and suppressing diarrhea in that situation can cause harm. And don’t give over-the-counter anti-diarrheal medications to children unless a doctor specifically recommends it. In kids, these drugs can make it harder for the body to clear the virus.
Probiotics May Shorten Recovery
There’s moderate evidence that certain probiotics can reduce how long diarrhea lasts. A large meta-analysis of randomized controlled trials found that Saccharomyces boulardii (a yeast-based probiotic sold under brand names like Florastor) shortened diarrhea duration by roughly 1.25 days compared to placebo and significantly reduced the risk of diarrhea lasting two or more days. It was the most effective single probiotic strain studied for acute diarrhea in children, and it’s widely available without a prescription.
Probiotics aren’t a guaranteed fix, and they work best when started early in the illness. They’re worth trying alongside rehydration, not as a replacement for it.
Rest More Than You Think You Need
The combination of the virus, dehydration, and not eating leaves your body genuinely depleted. Sleep as much as possible, especially during the first 24 to 48 hours. Trying to push through and maintain your normal routine typically extends how long you feel terrible. Cancel your plans if you can. Your body is directing energy toward fighting off the infection, and rest lets it do that more efficiently.
Signs You Need Medical Help
Most stomach flu resolves on its own, but dehydration can become dangerous, particularly in young children, older adults, and people with weakened immune systems. Watch for these warning signs in adults: excessive thirst, dry mouth, dark yellow urine or very little urine output, and severe weakness, dizziness, or lightheadedness. Any of these mean you’re losing fluid faster than you’re replacing it.
In infants, the red flags are more specific: no wet diaper in six hours, a sunken soft spot on the top of the head, a dry mouth, or crying without tears. These all warrant prompt medical attention. For children, compare how much they’re drinking and urinating against what’s normal for them. A noticeable drop in either is a sign of dehydration.
Preventing Spread to Your Household
Norovirus is extremely contagious, and you can spread it before you even feel sick and for days after symptoms stop. A few practical steps reduce the chance of taking down your whole household.
Wash your hands thoroughly with soap and water after every trip to the bathroom and before touching food. Hand sanitizer is not enough for norovirus. For surfaces (bathroom counters, toilet handles, doorknobs), use a disinfectant specifically labeled as effective against norovirus. The EPA maintains a list of approved products (List G), and most require the surface to stay wet with the product for anywhere from one to ten minutes to actually kill the virus. Quaternary ammonium-based cleaners need a full ten minutes of contact time, while hydrogen peroxide-based products can work in as little as one to two minutes. Check the label for specific instructions.
Keep the sick person’s towels, utensils, and drinking glasses separate. Wash soiled laundry on the hottest setting and dry it completely. If someone vomits on carpet or upholstery, clean the area immediately and keep others away from it, since norovirus particles can become airborne briefly during vomiting episodes.