Most food poisoning runs its course in one to three days without any medication at all. The real priority is replacing lost fluids. But when symptoms are making you miserable, a few over-the-counter options can help manage diarrhea, nausea, and discomfort while your body clears the infection.
Fluids Come First
Before reaching for any pill, the single most important thing you can do is drink fluids. Vomiting and diarrhea pull water and electrolytes out of your body fast, and dehydration is the main reason food poisoning sends people to the emergency room. Water works, but oral rehydration solutions or drinks with electrolytes are better because they replace the sodium and potassium you’re losing. Sip small amounts frequently rather than gulping large volumes, especially if you’re still vomiting.
Signs that dehydration is becoming serious include urinating very little, a dry mouth and throat, and feeling dizzy when you stand up. If you’re vomiting so often that you can’t keep any liquids down, that’s a signal you may need medical attention and possibly IV fluids.
Bismuth Subsalicylate for Nausea and Diarrhea
Bismuth subsalicylate, sold as Pepto-Bismol and Kaopectate, is one of the most versatile options for food poisoning because it targets both nausea and diarrhea. It works by reducing inflammation in your gut lining, slowing intestinal secretions, and helping your intestines reabsorb fluid. It also has mild antimicrobial properties that can limit bacterial growth on the stomach lining without disrupting normal gut bacteria.
The standard adult dose is 524 mg every 30 minutes to one hour as needed, up to eight doses in 24 hours, for up to two days. It’s available in regular and maximum strength tablets and liquid. One important caution: bismuth subsalicylate contains a compound related to aspirin, so it should not be given to children or teenagers under 16 because of the risk of Reye’s syndrome, a rare but serious condition. Anyone with an aspirin allergy should also avoid it.
Loperamide for Persistent Diarrhea
Loperamide (Imodium) slows down the movement of your intestines, giving your body more time to absorb water from stool. For acute diarrhea, the recommended starting dose for adults is 4 mg, followed by 2 mg after each loose stool, with a maximum of 8 mg per day when using it without a prescription.
This one comes with important restrictions. Do not take loperamide if you have a fever, if there’s blood in your stool, or if you suspect a bacterial infection with an invasive pathogen like Salmonella, Shigella, or Campylobacter. In those situations, diarrhea is actually your body’s way of flushing out the pathogen, and slowing that process down can make things worse. If your diarrhea hasn’t improved within 48 hours of taking loperamide, stop using it and see a doctor.
Loperamide is not recommended for infants under two years old and should be used cautiously in children. Talk with a doctor before giving it to any child.
Pain and Fever Relief
If food poisoning is causing body aches, headache, or a low fever, acetaminophen (Tylenol) is the safest choice. It won’t irritate your already-inflamed stomach lining.
Ibuprofen (Advil, Motrin) and aspirin are harder on the stomach and can worsen nausea or contribute to stomach irritation when your gut is already under stress. If you can, stick with acetaminophen until your symptoms have settled. Aspirin should not be given to children under 16.
When Antibiotics Are Needed
Most food poisoning is viral or caused by bacterial toxins, and antibiotics won’t help in either case. Your immune system handles it. But certain bacterial infections do require prescription treatment, particularly when symptoms are severe.
Your doctor is more likely to prescribe antibiotics if you have a high fever along with diarrhea, bloody stools (dysentery), or symptoms lasting more than a few days. The specific antibiotic depends on the suspected pathogen. Azithromycin is generally preferred for dysentery or febrile diarrhea. Some parasitic infections, like Giardia or Cyclospora, require their own targeted treatments that only a doctor can prescribe after testing.
If vomiting is so severe that you can’t keep anything down, a doctor may prescribe an anti-nausea medication like ondansetron, which works by blocking the signals in your brain that trigger vomiting. In children with gastroenteritis, ondansetron has been shown to reduce vomiting, the need for IV fluids, and hospitalization rates.
Probiotics May Shorten Recovery
Probiotics won’t stop food poisoning symptoms in their tracks, but certain strains can shorten how long diarrhea lasts. A network meta-analysis of randomized controlled trials found that Saccharomyces boulardii, a beneficial yeast, reduced diarrhea duration by roughly 1.25 days compared to placebo, with moderate-quality evidence behind it. Lactobacillus reuteri showed a similar benefit, cutting diarrhea by about 0.84 days. Both strains also significantly reduced the risk of diarrhea lasting two days or more.
Of all probiotics studied, Saccharomyces boulardii appeared to be the most effective overall. It’s widely available in supplement form at pharmacies. Starting it early in the course of illness gives it the best chance of helping. Probiotics are generally safe for most adults and children, though people with compromised immune systems should check with a doctor first.
Medications to Avoid in Children
Children’s bodies handle food poisoning differently, and several common adult remedies are unsafe for them. Loperamide and bismuth subsalicylate can both be dangerous for infants and young children. Aspirin carries the risk of Reye’s syndrome in anyone under 16. The NIDDK specifically advises talking with a doctor before giving any over-the-counter anti-diarrheal to a child.
For children, the treatment approach centers on fluid replacement with pediatric oral rehydration solutions. Acetaminophen can be used for discomfort at age-appropriate doses. If a child’s symptoms are severe, particularly if there’s bloody diarrhea or signs of systemic infection, a doctor may consider antibiotics. Azithromycin is typically the first choice for children who need one.
What a Typical Recovery Looks Like
With or without medication, most food poisoning resolves within one to three days. During that time, your approach is straightforward: stay hydrated, manage your worst symptoms with the appropriate over-the-counter options listed above, and ease back into eating with bland, easy-to-digest foods when you feel ready. Rice, toast, bananas, and broth are gentle starting points.
Symptoms that should prompt you to seek medical care include blood in your stool, a fever above 102°F (38.9°C), signs of dehydration despite your best efforts to drink fluids, diarrhea lasting more than three days, or persistent vomiting that prevents you from keeping liquids down. These can signal a more serious infection that needs professional treatment.