Most cases of diarrhea stop on their own within a few days, but the right combination of fluids, diet changes, and over-the-counter medication can shorten the episode and ease symptoms significantly. Acute diarrhea, defined as three or more loose or watery stools per day lasting less than 14 days, is almost always caused by a virus, contaminated food, or a medication side effect. Here’s what actually works to get it under control.
Replace Fluids and Electrolytes First
The most immediate risk from diarrhea isn’t the diarrhea itself. It’s dehydration. Every loose stool pulls water, sodium, and potassium out of your body, and replacing plain water alone isn’t enough because it lacks the electrolytes your intestines need to absorb fluid efficiently.
The World Health Organization’s oral rehydration solution, used worldwide to treat dehydration, contains a precise ratio of glucose, sodium chloride, potassium chloride, and citrate dissolved in water. You don’t need to mix your own. Pharmacy rehydration drinks like Pedialyte or store-brand equivalents follow similar formulations. Sports drinks are less ideal because they contain more sugar and less sodium than your gut needs, but they’re better than nothing.
Aim to drink small, frequent sips rather than large gulps, which can trigger more cramping. If you notice dark urine, dry mouth, dizziness, or extreme thirst, those are signs dehydration is already setting in and you need to increase your fluid intake immediately.
Over-the-Counter Medications That Work
Two OTC options have solid evidence behind them, and they work through different mechanisms.
Loperamide (Imodium) is the most effective fast-acting option. It slows the muscle contractions in your intestinal wall, which gives your gut more time to absorb water from stool. It also increases rectal tone, reducing that urgent “need to go now” feeling. The standard OTC dose is 4 mg to start, then 2 mg after each loose stool, with a maximum of 8 mg per day. Most people notice a significant reduction in frequency within a few hours.
Bismuth subsalicylate (Pepto-Bismol) takes a different approach. It has mild antibacterial properties that prevent bacteria from binding to the lining of your gut, which reduces the inflammatory signals driving the diarrhea. It also blocks certain chemical messengers called prostaglandins that increase intestinal cramping and fluid secretion. Bismuth subsalicylate is particularly useful for traveler’s diarrhea and milder cases where you want symptom relief without fully stopping bowel motility. One side effect to expect: it can turn your tongue and stool black temporarily, which is harmless.
One important note: if your diarrhea comes with a high fever (over 102°F) or bloody stools, avoid loperamide. In those cases, your body may be trying to flush out a bacterial infection, and slowing things down can make it worse.
What to Eat (and What to Avoid)
You don’t need to starve yourself, but what you eat matters. The goal is to give your irritated gut easily digestible food that won’t pull more water into your intestines. Plain rice, bananas, toast, boiled potatoes, and plain crackers are all good starting points. These foods are low in fiber, fat, and sugar, all of which can worsen loose stools.
Soluble fiber deserves special mention. Unlike insoluble fiber (the kind in raw vegetables and whole grains that speeds things along), soluble fiber dissolves in water and forms a gel-like material that absorbs excess fluid and adds bulk to stool. Good sources include bananas, oatmeal, applesauce, and white rice. Pectin, a type of soluble fiber found naturally in apples, is one reason applesauce has long been a go-to food during diarrhea episodes.
Avoid dairy products, fried or greasy food, caffeine, alcohol, and artificial sweeteners (especially sorbitol and mannitol, common in sugar-free gum and candy). These either stimulate your gut or draw more water into your intestines, making things worse.
Probiotics for Recovery
Probiotics can help, particularly when diarrhea is caused by antibiotics disrupting your normal gut bacteria. Two specific strains have the strongest evidence. A yeast-based probiotic called Saccharomyces boulardii has shown efficacy in preventing antibiotic-associated diarrhea and recurrent gut infections in adults. A bacterial strain called Lactobacillus rhamnosus GG (often labeled LGG on packaging) has the best track record for antibiotic-associated diarrhea in children.
For a standard viral stomach bug, the evidence for probiotics is more modest. They may shorten an episode by roughly half a day to a day, which some people find worthwhile. Look for products that list specific strain names on the label rather than generic “probiotic blend” formulations.
Ginger as a Natural Option
Ginger has preliminary evidence supporting its use for diarrhea, particularly the type linked to irritable bowel syndrome. In animal studies, ginger significantly reduced stool frequency and the water content of stool by calming inflammatory responses in the gut wall. The active compound responsible, called 6-gingerol, performed comparably to a prescription gut antibiotic in reducing diarrhea symptoms. While human clinical trials are still limited, ginger tea or ginger capsules are a low-risk option that many people find soothing during an episode.
Diarrhea in Children
Children dehydrate faster than adults, so fluid replacement is even more critical. Continue breastfeeding or formula feeding as normal, and offer an oral rehydration solution between feedings. Avoid fruit juice, which contains sugars that can worsen diarrhea.
The World Health Organization recommends zinc supplementation for children with diarrhea: 20 mg per day for 10 to 14 days, or 10 mg per day for infants under six months. Zinc has been shown to reduce the severity and duration of episodes. This recommendation is especially relevant in areas where zinc deficiency is common, but it’s worth discussing with your child’s pediatrician regardless of location.
Watch for warning signs that need medical attention: no wet diaper in three or more hours, a fever above 102°F, bloody or black stools, a sunken appearance around the eyes or cheeks, or skin that doesn’t spring back when gently pinched. In children, diarrhea that doesn’t improve within 24 hours also warrants a call to the doctor.
How Long Diarrhea Typically Lasts
Most acute diarrhea resolves within two to four days without any treatment at all. Viral gastroenteritis (the common stomach bug) usually peaks on day one or two and steadily improves from there. Food poisoning episodes tend to be shorter, often clearing within 24 to 48 hours.
If diarrhea persists beyond 14 days, it’s classified as chronic or persistent diarrhea, which tends to have non-infectious causes like food intolerances, irritable bowel syndrome, inflammatory bowel disease, or medication side effects. This timeline is the key dividing line: under two weeks is usually something your body handles on its own, while anything beyond that points to an underlying issue worth investigating.
Signs That Need Medical Attention
For adults, seek care if diarrhea lasts more than two days without any improvement, if you develop a fever above 102°F, or if you see blood or black coloring in your stool. Severe abdominal or rectal pain is another red flag. Signs of significant dehydration, including dark urine, extreme thirst, dry mouth, dizziness, or producing very little urine, mean you may need IV fluids. More than 10 bowel movements a day, or losing fluid far faster than you can drink it, qualifies as severe diarrhea and needs prompt attention.