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 your misery and prevent complications. The biggest immediate risk isn’t the diarrhea itself; it’s the water and electrolytes you’re losing with every trip to the bathroom.
Fluids and Electrolytes Come First
Replacing lost fluid is the single most important thing you can do. Even mild dehydration (losing just 1% to 3% of your body weight in fluid) causes a slightly elevated heart rate and dry mouth. At moderate levels (4% to 6% loss), your blood pressure drops when you stand up and your body starts conserving urine. Severe dehydration brings confusion, lethargy, and dangerously low blood pressure.
Water alone isn’t ideal because diarrhea also flushes out sodium, potassium, and other electrolytes. The World Health Organization’s oral rehydration solution combines water with small amounts of salt and sugar in precise ratios, and pre-mixed packets are available at most pharmacies. You can also sip clear broths, coconut water, or diluted fruit juice. The sugar in these drinks isn’t just for taste: it activates a transport system in your intestinal lining that pulls sodium and water back into your body.
Take small, frequent sips rather than gulping large amounts, which can trigger nausea. If you’re urinating less than usual or your urine is dark yellow, you need to drink more.
Over-the-Counter Medications
Two common pharmacy options work in different ways. Loperamide (sold as Imodium) slows the muscular contractions of your intestines, giving your gut more time to absorb water. In clinical comparisons, loperamide provided faster and more effective relief than bismuth subsalicylate (Pepto-Bismol) at standard daily doses. It’s a good choice when you need to get through a workday or a flight.
Bismuth subsalicylate takes a gentler approach, reducing inflammation in the gut lining and binding to toxins produced by some bacteria. It’s better suited for milder symptoms or traveler’s diarrhea. Don’t use it if you’re allergic to aspirin, since it’s chemically related.
Neither medication should be used if you have a high fever or bloody stools, because those signs suggest an infection your body may need to fight off rather than slow down.
What to Eat (and What to Skip)
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s fine for the first day or two, but it’s nutritionally thin. Harvard Health notes there are no studies showing BRAT is better than other gentle options, and sticking with it too long can delay your recovery by depriving you of protein and other nutrients.
Once your stomach settles, broaden your diet to include cooked carrots, butternut or pumpkin squash, sweet potatoes without skin, avocado, skinless chicken or turkey, fish, and eggs. These foods are easy to digest but supply the protein and micronutrients your body needs to repair the gut lining. Cochrane reviews of dietary reintroduction suggest that starting solid food early, within about 12 hours of beginning rehydration, is safe and may even speed recovery compared to prolonged fasting.
Certain foods and drinks actively make diarrhea worse:
- Dairy products. If you’re even mildly lactose intolerant (and many people are without realizing it), undigested lactose pulls extra water into your intestines, worsening loose stools.
- Caffeine. Coffee, tea, and sodas stimulate chloride secretion in the gut, which drags water along with it. This is the last thing you need.
- Sugar-free gum and candy. Sorbitol and other sugar alcohols used as artificial sweeteners are poorly absorbed. They sit in your intestines and draw water in by osmosis, the same basic mechanism as a laxative.
- Fruit juice in large amounts. Pears, prunes, peaches, and apple juice contain both sorbitol and fructose, which can trigger or worsen diarrhea when consumed in excess.
- Greasy or spicy food. These stimulate gut contractions and can irritate an already inflamed digestive tract.
Probiotics Can Shorten Recovery
Probiotics are live microorganisms that help restore the balance of bacteria in your gut. A large meta-analysis covering nearly 12,000 participants found that probiotics reduced the duration of acute diarrhea by roughly 16 hours compared to placebo. For persistent diarrhea lasting more than two weeks, the benefit was even more dramatic: about 96 hours (four days) shorter.
The most studied strains are Saccharomyces boulardii (a beneficial yeast) and Lactobacillus rhamnosus GG, which has been shown in separate reviews to cut diarrhea duration by about 20 hours. The European Society for Paediatric Gastroenterology, Hepatology and Nutrition specifically recommends these strains, along with Lactobacillus reuteri, for children with acute diarrhea. Look for products that list specific strain names on the label, not just the genus.
Probiotics are most effective when started early in a diarrheal episode. They’re available as capsules, powders, and chewable tablets at most drugstores.
Helping Children With Diarrhea
Children dehydrate faster than adults because of their smaller body size, so fluid replacement is even more urgent. Offer an oral rehydration solution in small sips or, for toddlers, by spoon or syringe. Avoid giving children fruit juice or sports drinks as their primary fluid, since the high sugar content can pull more water into the intestines.
The WHO recommends zinc supplementation during pediatric diarrhea episodes: 20 mg per day for 10 to 14 days for children over six months, and 10 mg per day for infants under six months. Zinc helps repair the intestinal lining and strengthens the immune response. It’s available as dissolvable tablets or syrup in most pharmacies.
For children, the timeline for concern is shorter than for adults. If a child’s diarrhea hasn’t improved within 24 hours, or if they develop a fever above 102°F, or if you see blood or black color in their stools, they need medical attention promptly.
Warning Signs That Need Medical Attention
Most diarrhea clears up within two to three days. For adults, the Mayo Clinic identifies these red flags: diarrhea lasting more than two days without any improvement, severe abdominal or rectal pain, bloody or black stools, and fever above 102°F (39°C). Any of these warrant a visit to your doctor, since they can indicate a bacterial infection that needs treatment or another condition that won’t resolve on its own.
Watch for signs of dehydration that go beyond simple thirst. Dizziness when standing up, a rapid heartbeat at rest, skin that feels cool or clammy, and very dark or infrequent urine all suggest you’re losing fluid faster than you’re replacing it. In older adults and young children, dehydration can escalate quickly from uncomfortable to dangerous.