Most cases of food poisoning resolve on their own within one to three days, and a few over-the-counter products can make that wait more bearable. The right combination depends on your specific symptoms, whether that’s nonstop diarrhea, nausea, cramping, or fever.
Bismuth Subsalicylate for Nausea and Diarrhea
Bismuth subsalicylate, the active ingredient in Pepto-Bismol and Kaopectate, is the most versatile OTC option for food poisoning. It works three ways at once: it slows the flow of fluids into the bowel, reduces inflammation in the intestinal lining, and has mild antimicrobial properties that can help kill some of the organisms causing your symptoms. That makes it useful for both nausea and diarrhea, which is why it’s often the first thing people reach for.
One important caveat: bismuth subsalicylate contains a compound related to aspirin. If you’re allergic to aspirin, pregnant, or taking blood thinners, skip it. It should also not be given to children or teenagers recovering from flu-like illnesses due to the risk of Reye’s syndrome.
Loperamide for Persistent Diarrhea
Loperamide (sold as Imodium) is the strongest OTC antidiarrheal available. It works by slowing down the movement of your intestines, giving your body more time to absorb water from stool. The standard OTC dosing is 4 mg to start (two capsules or tablets), then 2 mg after each loose stool, up to a maximum of 8 mg per day.
There’s an important restriction here. Loperamide is contraindicated when you have bloody diarrhea, a high fever, or signs of a more serious bacterial infection. In those situations, slowing your gut down can actually trap the bacteria inside and make things worse. If your diarrhea is watery and you don’t have a fever, loperamide is generally safe for short-term use. If your symptoms aren’t improving or are getting worse, stop taking it.
Acetaminophen for Fever and Cramps
If food poisoning comes with a low-grade fever or body aches, acetaminophen (Tylenol) is the better choice over ibuprofen or aspirin. It’s easier on the stomach and can be taken without food, which matters when you can barely keep anything down. Ibuprofen and aspirin both irritate the stomach lining and are typically taken with food, making them a poor match for an already inflamed digestive system.
Oral Rehydration Is the Most Important Step
No pill matters as much as replacing the fluid and electrolytes you’re losing. Dehydration is the main danger of food poisoning, especially when vomiting and diarrhea hit at the same time. Water alone isn’t enough because you’re also losing sodium and potassium with every trip to the bathroom.
Oral rehydration solutions like Pedialyte, DripDrop, or store-brand equivalents are specifically formulated to match what your gut absorbs best. Research shows the optimal range for absorption is roughly 45 to 60 milliequivalents per liter of sodium paired with 80 to 110 millimoles of glucose. That’s a precise balance, and it’s why rehydration drinks work better than sports drinks, which tend to have too much sugar and not enough sodium. If you can’t get to a store, a simple homemade version (half a teaspoon of salt and six teaspoons of sugar dissolved in a liter of water) will get you through.
Take small, frequent sips rather than gulping. If you’re vomiting, try a tablespoon every few minutes. Your intestines can absorb small amounts even when your stomach is rebelling.
Probiotics as a Supporting Player
Certain probiotic strains can shorten the duration of acute diarrhea by roughly one day. The best-studied strain for this purpose is Saccharomyces boulardii, a beneficial yeast you can find in products like Florastor. Multiple meta-analyses in both children and adults have found it reduces both the duration and frequency of loose stools during acute gastroenteritis. It won’t stop food poisoning in its tracks, but it can nudge your gut flora back toward normal faster. Look for it specifically by strain name on the label, since not all probiotics have the same evidence behind them.
What to Eat While Recovering
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. These foods are soft, bland, and low in fiber, which makes them gentle on an irritated stomach. But you don’t need to limit yourself to just those four. Brothy soups, oatmeal, boiled potatoes, saltine crackers, and dry cereal all work similarly well.
The key is to keep BRAT-style eating to a day or two at most. A strict bland diet lacks protein, calcium, vitamin B12, and fiber, all of which your body needs to actually recover. As soon as you can tolerate more variety, start adding it back. The American Academy of Pediatrics no longer recommends a strict BRAT diet for children at all, considering it too nutritionally restrictive to support recovery.
When OTC Treatment Isn’t Enough
Most food poisoning is miserable but not dangerous. However, certain symptoms signal something more serious. The CDC recommends seeking medical attention if you experience bloody diarrhea, diarrhea lasting more than three days, a fever above 102°F, vomiting so frequent you can’t keep liquids down, or signs of dehydration like very little urination, a dry mouth, or dizziness when standing. These can indicate a bacterial infection that needs prescription treatment, or dehydration severe enough to require IV fluids.
Young children, older adults, pregnant people, and anyone with a weakened immune system have a lower threshold for complications and should be evaluated sooner rather than later.