Norovirus runs its course in 1 to 3 days for most people, and the single most important thing you can do during that time is prevent dehydration. There’s no antiviral medication that kills norovirus. Recovery is about managing symptoms, replacing lost fluids, and avoiding spreading the virus to others.
What to Expect and How Long It Lasts
Symptoms typically appear 12 to 48 hours after exposure. The worst of it, waves of vomiting and watery diarrhea, usually peaks in the first 24 hours. Most people feel significantly better within 1 to 3 days. You may also have stomach cramps, nausea, low-grade fever, muscle aches, and fatigue.
Even after you feel better, you can still spread the virus for two weeks or more. That matters for hand hygiene and food preparation, especially if you live with young children, older adults, or anyone with a weakened immune system.
Staying Hydrated Is the Priority
Dehydration is the main danger with norovirus, not the virus itself. Every round of vomiting or diarrhea pulls water and electrolytes out of your body, and replacing both is critical. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing. An oral rehydration solution does.
You can buy oral rehydration packets at any pharmacy, or make a version at home using the World Health Organization’s recipe: mix half a teaspoon (3 grams) of salt and 2 tablespoons (30 grams) of sugar into about 1 liter of clean water. The sugar helps your intestines absorb the sodium and water more efficiently. Sip it slowly rather than gulping, especially if you’re still vomiting. Small, frequent sips every few minutes are far more effective than drinking a full glass and losing it.
Sports drinks are a second-choice option. They contain more sugar and less sodium than ideal, but they’re better than water alone if you can’t get rehydration salts.
Signs of Dehydration to Watch For
Mild dehydration shows up as a dry mouth, slight thirst, and darker urine. At this stage, oral rehydration is usually enough. Moderate dehydration brings dizziness when you stand, a noticeably fast heart rate, and decreased urination. If you or someone you’re caring for develops confusion, lethargy, very little or no urine output, cool or clammy skin, or a rapid weak pulse, that’s severe dehydration and requires emergency medical attention. Young children and older adults can progress from mild to severe faster than healthy adults.
Eating During and After Norovirus
The old advice to stick to the BRAT diet (bananas, rice, applesauce, toast) is outdated. The CDC considers it unnecessarily restrictive, noting it provides suboptimal nutrition during a time when your gut actually needs fuel to recover. Withholding food for more than 24 hours slows recovery. Early feeding reduces illness duration and helps the intestinal lining repair itself.
Start eating when you feel able to, even if that’s just a few bites. Stick to whatever foods sound tolerable. Plain carbohydrates, soups, crackers, and lean proteins are all fine. Avoid greasy, very spicy, or heavily sweetened foods until your stomach settles, but don’t limit yourself to four bland items. Children should continue eating their normal diet as tolerated during episodes of diarrhea.
Managing Nausea and Vomiting
For most adults, the vomiting phase passes within 12 to 24 hours without medication. Rest, small sips of fluid, and patience are usually enough. Over-the-counter options like dimenhydrinate (the active ingredient in Gravol and Dramamine) can help reduce nausea, though they may cause drowsiness.
For children who can’t keep fluids down, a prescription anti-nausea medication can make a significant difference. In clinical trials, one commonly prescribed option increased the proportion of children who stopped vomiting by about 34% compared to placebo, and reduced the need for IV rehydration by more than half. If your child is vomiting repeatedly and refusing fluids, calling your pediatrician about anti-nausea medication is reasonable. The goal isn’t comfort alone: stopping the vomiting long enough to get fluids in can prevent a trip to the emergency room.
Preventing Spread in Your Household
Norovirus is extraordinarily contagious. A tiny amount of virus, far less than you can see, is enough to infect someone. Household transmission is common, but you can reduce the odds.
Soap and water is your best defense for hand hygiene. Alcohol-based hand sanitizers do not work well against norovirus. The virus lacks the outer coating that alcohol disrupts in other germs. Wash your hands thoroughly with soap and running water for at least 20 seconds after using the bathroom, after cleaning up vomit or diarrhea, and before touching food or shared surfaces. Hand sanitizer can be used as a supplement, but never as a substitute.
Clean contaminated surfaces with a bleach-based solution. Norovirus survives on countertops, doorknobs, and light switches for days. Regular household cleaners often aren’t enough. Mix about 5 tablespoons of household bleach per gallon of water, apply it to the surface, and let it sit for at least 10 minutes before wiping. Wash contaminated clothing and bedding on the hottest water setting your machine allows, and dry on high heat.
If possible, designate one bathroom for the sick person. Keep their towels, cups, and utensils separate. The person recovering from norovirus should avoid preparing food for others for at least two to three days after symptoms stop, and ideally longer given that viral shedding continues for weeks.
Who Faces Higher Risk
Norovirus is miserable for everyone, but it’s genuinely dangerous for certain groups. Infants and young children dehydrate quickly because of their smaller fluid reserves. Older adults, particularly those in care facilities, face the same risk compounded by medications that may already affect kidney function or fluid balance.
People with weakened immune systems, including organ transplant recipients and those undergoing chemotherapy, face a different problem entirely. Their bodies may not clear the virus in the usual few days. In immunocompromised patients, norovirus can become a chronic infection lasting weeks, months, or even years, with persistent diarrhea that becomes increasingly debilitating. One study of pediatric stem cell transplant recipients found that the median time to clear norovirus was 145 days. In children with inherited immune deficiencies, over half were still shedding the virus after a median of 9.5 months. For these individuals, what looks like a simple stomach bug can lead to serious intestinal complications and requires close medical follow-up.
What You Don’t Need
Antibiotics do nothing against norovirus. It’s a virus, not a bacterial infection. Anti-diarrheal medications like loperamide can slow diarrhea in adults but won’t shorten the illness, and they’re generally not recommended for young children. Probiotics are widely marketed for gut recovery, but evidence for their benefit during acute norovirus infection is limited. Your gut microbiome typically rebounds on its own once the virus clears.
The most effective approach is also the simplest: fluids in, rest, small meals when tolerable, and thorough handwashing to protect everyone else in the house.