Most food poisoning resolves on its own within one to three days, and the single most important thing you can do is stay hydrated. Beyond that, a few over-the-counter options, smart food choices, and knowing when symptoms cross into dangerous territory will get you through it faster and more comfortably.
Hydration Is the Top Priority
Vomiting and diarrhea pull water and electrolytes out of your body fast. Replacing them is the cornerstone of food poisoning treatment, whether you’re dealing with a mild case or a severe one. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing. An oral rehydration solution, available at most pharmacies, is the gold standard because it contains a precise balance of salts and sugar that your intestines can absorb even when inflamed.
If you can’t get to a store, the CDC recommends dissolving a standard ORS packet in one liter of clean water. Adults with active vomiting or diarrhea should aim for about three liters of rehydration fluid per day. Children need roughly one liter per day, and babies and toddlers about half a liter. Take small, frequent sips rather than large gulps, especially if you’re still throwing up. Sucking on ice chips can help if even sips come back up.
Over-the-Counter Medications That Help
Two common options can reduce diarrhea while your body clears the infection. Loperamide (sold as Imodium) slows the movement of your gut, giving your intestines more time to absorb water. The typical adult approach is two capsules after the first loose stool, then one capsule after each subsequent loose stool, up to a maximum of eight capsules in 24 hours. Bismuth subsalicylate (Pepto-Bismol, Kaopectate) coats the stomach lining and can ease both nausea and diarrhea.
There are important limits, though. Neither medication should be used if you have a fever or bloody diarrhea. Those signs suggest a bacterial or parasitic infection that your body needs to flush out, and slowing your gut down can make things worse. Both medications can also be dangerous for infants and young children.
What to Eat During Recovery
You may have heard you need to stick to bland foods like bananas, rice, applesauce, and toast. Research actually shows that following a restricted diet doesn’t help treat diarrhea. Once your appetite returns, you can go back to eating your normal diet, even if diarrhea hasn’t fully stopped. Fasting isn’t recommended either.
That said, certain foods and drinks are more likely to make symptoms worse while your gut is still irritated:
- Caffeinated drinks like coffee, tea, and some sodas can speed up your gut and worsen diarrhea.
- High-fat foods like fried food, pizza, and fast food are harder to digest.
- Sugary drinks and fruit juices can pull more water into the intestines and make loose stools worse.
- Dairy products may cause problems because some people temporarily lose the ability to digest lactose after food poisoning. This can last a month or more.
Probiotics May Shorten Symptoms
Certain probiotic strains can reduce the duration of diarrhea by roughly one day. The best-studied options are Saccharomyces boulardii (a beneficial yeast) and Lactobacillus rhamnosus GG, often labeled as LGG. A review of 22 trials involving over 2,400 children found that Saccharomyces boulardii, taken for five to ten days, reduced both diarrhea duration and stool frequency. These findings are strong enough that pediatric gastroenterology groups now recommend specific probiotics for acute gastroenteritis in children.
For adults, the evidence is less extensive, but the same strains appear to help. Look for products that list the specific strain on the label, not just “probiotic blend.” You can find both Saccharomyces boulardii and LGG at most pharmacies.
When Food Poisoning Becomes Dangerous
Most cases are miserable but not medically serious. However, certain red flags mean you need professional care:
- Bloody diarrhea, which suggests a bacterial infection that may need antibiotics.
- Diarrhea lasting more than three days without improvement.
- Fever above 102°F (38.9°C).
- Inability to keep any liquids down due to frequent vomiting.
- Signs of dehydration: urinating very little, dry mouth and throat, or dizziness when standing.
Higher Risk for Some Groups
Food poisoning hits harder in young children, older adults, pregnant people, and anyone with a weakened immune system. These groups dehydrate faster, and infections that would be minor in a healthy adult can become serious. Infants are especially vulnerable because their small body size means fluid losses add up quickly. Over-the-counter anti-diarrheal medications are not safe for infants and young children, so rehydration and medical guidance are the main tools for these populations.
Older adults face a higher risk of heart rhythm problems with loperamide, making professional guidance more important before reaching for over-the-counter options. For pregnant individuals, dehydration itself can trigger complications, so aggressive fluid replacement matters even more than usual.
Antibiotics: Rarely Needed
Most food poisoning is caused by viruses or toxins that antibiotics can’t touch. Even many bacterial cases resolve without them. Antibiotics are typically reserved for severe bacterial infections identified through a stool test, or for people whose immune systems can’t fight the infection effectively on their own. Taking antibiotics unnecessarily can disrupt your gut bacteria and actually prolong digestive symptoms. If your doctor suspects a bacterial cause, they’ll order a stool culture before prescribing anything.
A Practical Timeline
Symptoms usually start anywhere from one hour to several days after eating contaminated food, depending on the pathogen involved. The worst of the vomiting and diarrhea typically peaks within the first 24 hours. Most people feel noticeably better within one to three days. During that window, your main job is to keep sipping fluids, rest, eat when you feel ready, and avoid anything that irritates your stomach. If you’re still feeling rough after 72 hours, or if symptoms are getting worse rather than better, that’s your signal to seek medical care.