There is no cure for norovirus. No antiviral medication, antibiotic, or supplement will kill the virus or shorten the illness. Norovirus runs its course in 1 to 3 days for most people, and the real goal during that window is managing symptoms and preventing dehydration. The good news: nearly everyone recovers fully without medical treatment.
Why There’s No Cure
Norovirus is a virus, so antibiotics don’t work against it. Unlike the flu, there’s no antiviral drug approved for norovirus either. Your immune system clears the infection on its own, typically within 72 hours. Symptoms usually start 12 to 48 hours after exposure, meaning the worst of it hits fast and ends relatively fast too.
Staying Hydrated Is the Priority
Vomiting and diarrhea pull fluid and electrolytes out of your body quickly. For most healthy adults, the virus itself isn’t dangerous, but dehydration can be. Small, frequent sips work better than gulping a full glass, which can trigger more vomiting. Water, broth, and oral rehydration solutions (the kind sold at pharmacies with a balanced mix of salt and sugar) are your best options.
Watch for these signs of dehydration, especially in children and older adults:
- Urinating much less than usual
- Dry mouth and throat
- Dizziness when standing up
- In young children: crying with few or no tears, or unusual sleepiness and fussiness
Severe dehydration sometimes requires IV fluids in a hospital. If someone can’t keep any liquids down for more than a day, or shows the signs above, that’s the point where medical attention matters.
What to Eat During and After
You may have heard you should stick to bananas, rice, applesauce, and toast. Research from the National Institute of Diabetes and Digestive and Kidney Diseases actually shows that following a restricted diet doesn’t help treat viral gastroenteritis. Most experts don’t recommend fasting or limiting your diet. Once your appetite returns, you can go back to eating normally, even if diarrhea hasn’t fully stopped.
That said, certain foods and drinks tend to make diarrhea worse while you’re recovering:
- Caffeinated drinks like coffee, tea, and some sodas
- High-fat foods like fried foods, pizza, and fast food
- Drinks and foods with a lot of simple sugar, including fruit juices and sweetened beverages
- Dairy products, since some people have trouble digesting lactose for up to a month after a norovirus infection
The lactose sensitivity point is worth noting. Even if you normally handle milk and cheese fine, your gut lining takes time to fully heal. If dairy seems to trigger loose stools in the weeks after you recover, that temporary sensitivity is the reason.
Over-the-Counter Medications
Adults can use loperamide (Imodium) or bismuth subsalicylate (Pepto-Bismol) to manage diarrhea symptoms. However, avoid both if you have a fever or bloody diarrhea, which could signal a different, more serious infection.
Children are a different story. Don’t give store-bought anti-diarrheal medications to kids unless a doctor specifically recommends it. These drugs can make it harder for a child’s body to clear the virus.
For nausea, there’s no standard over-the-counter fix that speeds recovery. The vomiting phase of norovirus is usually the shortest part, often lasting less than a day. Resting and sipping fluids in small amounts is the most effective approach.
How Long You’re Contagious
You’re most contagious while you have symptoms and for at least two days after they stop. Some people continue shedding the virus in their stool for two weeks or longer, even though they feel completely fine. This is why hand hygiene matters well beyond the point where you’re feeling better.
Preventing Spread at Home
Norovirus is extremely contagious, and it resists many common household cleaners. Alcohol-based hand sanitizers are often ineffective against it. The CDC specifically recommends against using hand sanitizer as a substitute for soap and water when dealing with norovirus. The virus lacks a fatty outer coating that alcohol dissolves in other germs, so sanitizer just doesn’t penetrate it well. Wash your hands thoroughly with soap and running water for at least 20 seconds, especially after using the bathroom and before handling food.
For surfaces like countertops, doorknobs, and toilet handles, use a bleach solution at a minimum concentration of 1,000 parts per million of sodium hypochlorite. In practical terms, that’s about 5 tablespoons of regular household bleach per gallon of water. Prepare this fresh daily, as the solution loses potency over time. Let it sit on the surface for at least 5 minutes before wiping. Standard disinfecting wipes and sprays that don’t contain bleach may not kill norovirus reliably.
Wash any contaminated clothing or linens in hot water and dry them on the highest heat setting. If someone vomits, clean the area immediately while wearing gloves, since norovirus particles can become airborne from vomit and settle on nearby surfaces.
Who Faces the Highest Risk
Norovirus is unpleasant for everyone, but it poses real danger to young children, older adults, and people with weakened immune systems. These groups lose fluids faster, recognize thirst less reliably, and have a harder time recovering from dehydration. For a healthy adult, norovirus is a miserable few days. For a frail 80-year-old or an infant, the same fluid loss can become a medical emergency. Keep a close eye on anyone in these groups, and don’t wait to seek help if they can’t keep fluids down.