Most cases of acute diarrhea resolve on their own within three to seven days without any specific treatment. The real goal isn’t to “cure” it but to manage symptoms, prevent dehydration, and avoid foods or habits that drag out recovery. Here’s what actually works.
Stay Hydrated First
Diarrhea pulls water and electrolytes out of your body fast. Replacing them is the single most important thing you can do. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing. Oral rehydration solutions (sold at most pharmacies) are the gold standard because they contain the right balance of salt, sugar, and water to maximize absorption. Broth, diluted fruit juice, and coconut water are decent alternatives if you can’t get a rehydration solution immediately.
Sip steadily rather than gulping large amounts at once, which can trigger nausea. If you’re urinating less than usual, your urine is dark, or you feel dizzy when standing up, you’re already behind on fluids and need to increase your intake.
What to Eat (and What to Skip)
You may have heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s been a go-to recommendation for decades, but clinical trials have shown that restricting yourself to just those four foods can actually slow recovery and deprive your body of the calories and nutrients it needs to heal. Randomized trials found that eating a normal, age-appropriate diet immediately after rehydration leads to lower stool output, shorter illness, and better nutritional outcomes compared to gradual or restrictive refeeding.
The better approach is to eat a variety of soft, easy-to-digest foods. Good options include cooked vegetables, lean proteins like chicken or fish, eggs, oatmeal, potatoes, and plain crackers. Eat smaller portions more frequently rather than large meals.
What you avoid matters just as much. The National Institute of Diabetes and Digestive and Kidney Diseases recommends staying away from:
- High-sugar foods and drinks, including candy, sweetened beverages, and some fruit juices. Fructose in particular can pull more water into the intestines and worsen symptoms.
- High-fat foods like fried items, pizza, and fast food, which are harder to digest.
- Dairy products containing lactose. Even if you normally tolerate milk, acute diarrhea can temporarily reduce your ability to digest lactose for up to a month after the episode.
- Caffeine and alcohol, both of which can increase intestinal motility and worsen dehydration.
Over-the-Counter Medications
Loperamide (the active ingredient in Imodium) slows gut contractions, giving your intestines more time to absorb water. It’s effective for reducing the frequency of loose stools. The FDA-approved maximum for adults is 8 mg per day when using it without a prescription. That typically means two caplets (4 mg) after the first loose stool, then one caplet (2 mg) after each subsequent episode, not exceeding 8 mg total in 24 hours.
Loperamide treats the symptom, not the cause. It’s useful when you need to get through a workday or a flight, but avoid it if you have a high fever or bloody stools, as those suggest a bacterial infection where slowing the gut down can do more harm than good. Bismuth subsalicylate (Pepto-Bismol) is another option that can reduce stool frequency and help with nausea, though it will temporarily turn your tongue and stool black.
Probiotics Can Shorten Recovery
Certain probiotic strains help restore the balance of gut bacteria disrupted during a bout of diarrhea. The most studied strain for this purpose, Saccharomyces boulardii, has been shown to reduce the duration of diarrhea by roughly 24 hours in both adults and children. It’s a yeast-based probiotic available over the counter, often sold under the brand name Florastor.
Lactobacillus-based probiotics have also shown modest benefits. Starting a probiotic at the onset of symptoms gives it the best chance of helping. It won’t stop diarrhea immediately, but shaving a full day off recovery time is clinically meaningful when you’re miserable.
Children Need a Different Approach
Kids dehydrate faster than adults, so fluid replacement is even more critical. Oral rehydration solutions formulated for children (like Pedialyte) are preferable to juice or sports drinks, which often contain too much sugar. Continue breastfeeding or formula feeding as usual.
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 both the severity and duration of diarrhea episodes in children. This recommendation is especially relevant in low-resource settings, but it’s worth discussing with your child’s pediatrician regardless of where you live.
How Long Recovery Takes
Infectious diarrhea, the most common type, typically starts 12 hours to four days after exposure to contaminated food or water and clears up within three to seven days. Viral causes (norovirus, rotavirus) tend to resolve on the shorter end. Bacterial infections can take the full week. If symptoms persist beyond seven days, the cause may be parasitic, medication-related, or tied to an underlying digestive condition that needs evaluation.
Signs That Need Medical Attention
Most diarrhea is a nuisance, not a danger. But severe dehydration is a medical emergency. Watch for confusion, extreme fatigue or lethargy, rapid heartbeat, dizziness when standing, and very little or no urine output. In extreme cases, dehydration can cause dangerously low blood pressure, kidney injury, and seizures.
Bloody or black stools, a fever above 102°F (39°C), or diarrhea lasting more than a week all warrant a call to your doctor. The same goes for diarrhea that started during or shortly after a course of antibiotics, which can signal a specific bacterial overgrowth that requires targeted treatment.