Most cases of acute diarrhea resolve on their own within a few days, but the right combination of fluids, food choices, and over-the-counter options can shorten the episode and keep you comfortable. Diarrhea lasting less than two weeks is classified as acute, two to four weeks as persistent, and anything beyond four weeks as chronic. The strategies below focus on acute diarrhea, which is by far the most common type.
Rehydration Comes First
Fluid loss is the biggest immediate risk with diarrhea, not the diarrhea itself. Each loose stool pulls water and electrolytes out of your body, and if you’re also vomiting or running a fever, the deficit adds up fast. Your goal is to replace what you’re losing, not just drink water. Plain water lacks the sodium and potassium your body needs, so oral rehydration solutions (sold at any pharmacy) are the most efficient option. Broth, diluted fruit juice, and coconut water also work.
Sip steadily rather than gulping large amounts at once, which can trigger nausea. Signs that dehydration is getting ahead of you include dark urine, dry mouth, dizziness when you stand up, and a noticeably faster heart rate. In severe cases, dehydration can cause confusion, lethargy, and dangerously low blood pressure. If you notice those symptoms, or if you simply can’t keep fluids down, that warrants urgent medical attention.
What to Eat (and What to Skip)
The old advice to stick strictly to bananas, rice, applesauce, and toast (the BRAT diet) has fallen out of favor. Most experts, including the National Institute of Diabetes and Digestive and Kidney Diseases, now say you can return to your normal diet as soon as you feel ready to eat. Restricting yourself to a handful of bland foods for days can actually slow recovery by depriving your body of the protein, fat, and micronutrients it needs to heal the gut lining.
That said, certain foods and drinks reliably make diarrhea worse and are worth avoiding until things settle down:
- Caffeine (coffee, tea, energy drinks) speeds up gut motility.
- Alcohol irritates the intestinal lining and promotes fluid loss.
- High-fat and fried foods are harder to digest when the gut is inflamed.
- Dairy products containing lactose, since temporary lactose intolerance is common during and shortly after a bout of diarrhea.
- Sugar alcohols like sorbitol, mannitol, and xylitol, found in sugar-free gum, candies, and many “diet” or “no sugar added” products. As little as 5 grams of sorbitol can cause gas and cramping, and doses above 20 grams per day can trigger diarrhea on their own. These sweeteners draw water into the intestine and speed up transit time.
- High-sugar drinks and fruit juices with large amounts of fructose, which pull water into the bowel the same way sugar alcohols do.
When you do eat, lean toward simple, well-cooked foods: rice, potatoes, chicken, eggs, oatmeal, and cooked vegetables. Small, frequent meals are easier on an irritated gut than three large ones.
Over-the-Counter Medications
Two widely available medications can reduce the frequency and urgency of loose stools. Loperamide (the active ingredient in Imodium) slows the movement of your intestines, giving them more time to absorb water. Bismuth subsalicylate (the active ingredient in Pepto-Bismol) works differently, reducing inflammation and binding to toxins in the gut. In a head-to-head comparison using standard nonprescription doses, loperamide provided faster and more complete relief than bismuth subsalicylate over a two-day period.
Both are appropriate for uncomplicated diarrhea. However, you should avoid loperamide if you have a high fever or bloody stools, because in those cases slowing the gut down can trap a harmful infection inside. Bismuth subsalicylate can darken your tongue and stool (harmless but startling) and should not be combined with aspirin or given to children recovering from viral illness.
Probiotics: Which Strains Actually Help
Not all probiotics are equal when it comes to diarrhea. A large evidence review found that Saccharomyces boulardii, a beneficial yeast, was the most effective single strain for shortening the duration of acute diarrhea, cutting symptom time significantly compared to placebo. Bifidobacterium species and Limosilactobacillus reuteri also showed meaningful benefits. Multi-strain formulas performed well, too.
Interestingly, Lactobacillus rhamnosus GG, one of the most heavily marketed probiotic strains, did not significantly shorten diarrhea duration in this analysis, though it did reduce the proportion of people still experiencing symptoms by the end of the trial period. If you’re buying a probiotic specifically to recover from diarrhea, look for one containing S. boulardii. It’s widely available and typically well tolerated.
Handling Traveler’s Diarrhea
Traveler’s diarrhea follows slightly different rules because it’s usually bacterial. The CDC classifies episodes by severity: mild cases (tolerable, not interfering with activities) can be managed with loperamide or bismuth subsalicylate alone. Moderate cases that disrupt your plans may warrant a short course of antibiotics, which a doctor can prescribe as a “just in case” supply before your trip.
For prevention, bismuth subsalicylate taken during travel reduces the incidence of traveler’s diarrhea by roughly 50%. Prophylactic antibiotics are not recommended for most travelers because they wipe out protective gut bacteria and can promote antibiotic resistance. The CDC reserves that option for immunocompromised individuals or people with serious underlying conditions. Antibiotic resistance patterns also vary by region. In South and Southeast Asia, for instance, resistance to common antibiotics among the bacteria that cause traveler’s diarrhea is widespread, which affects which medications a doctor would prescribe.
Children Need a Different Approach
Kids dehydrate faster than adults, so fluid replacement is even more critical. Oral rehydration solutions formulated for children are the best option. The World Health Organization recommends 20 mg of zinc per day for 10 to 14 days for children with acute diarrhea (10 mg per day for infants under six months). Zinc supplementation shortens the episode and reduces severity. It’s a standard part of diarrhea treatment protocols in many countries but often overlooked in others.
Children should continue eating their normal age-appropriate diet during diarrhea, and infants should continue breastfeeding or formula feeding. Restricting food intake slows recovery.
Warning Signs That Need Medical Attention
Most diarrhea passes without incident, but certain red flags change the picture. Blood or mucus in the stool, fever above 102°F (39°C), severe abdominal pain, and signs of significant dehydration (confusion, inability to urinate, rapid heartbeat, dizziness on standing) all warrant a visit to a doctor or emergency room. Diarrhea that persists beyond two weeks without improvement also needs evaluation, as it may point to an infection that won’t clear on its own, a food intolerance, or an underlying condition like inflammatory bowel disease or celiac disease.