Most cases of diarrhea resolve on their own within two to three days, but the right combination of fluids, food choices, and over-the-counter options can shorten that timeline and keep you comfortable. The single most important thing you can do is replace lost fluids, because dehydration is what makes diarrhea dangerous, not the diarrhea itself.
Start With Fluids, Not Medicine
Every loose stool pulls water, sodium, and potassium out of your body. Drinking plain water helps, but it doesn’t replace the electrolytes you’re losing. The World Health Organization’s oral rehydration formula is simple: mix half a teaspoon of salt and two tablespoons of sugar into about four cups of water. The sugar isn’t just for taste. It activates a transport system in your intestinal lining that pulls sodium and water back into your bloodstream, which plain water can’t do as efficiently.
If mixing your own solution sounds unappealing, store-bought electrolyte drinks work well. Sip steadily rather than gulping large amounts, which can trigger nausea. Avoid fruit juice, soda, and sports drinks with high sugar content. High concentrations of sugar actually draw more water into the intestine and can make diarrhea worse.
Over-the-Counter Medications That Help
Two medications are widely available without a prescription, and they work differently.
Loperamide (sold as Imodium) slows the movement of your intestines, giving them more time to absorb water. It’s the fastest way to reduce the frequency of trips to the bathroom. The FDA-approved maximum for over-the-counter use is 8 mg per day for adults. Follow the package directions carefully, because exceeding the recommended dose can cause serious heart problems.
Bismuth subsalicylate (sold as Pepto-Bismol) takes a different approach. It reduces inflammation in the gut lining, slows excess fluid secretion, and has mild antibacterial properties that can help when a stomach bug is the cause. One important caution: it contains a compound related to aspirin. If you’re allergic to aspirin, skip it entirely. It also shouldn’t be given to children or teenagers with flu-like symptoms due to the risk of Reye’s syndrome, a rare but serious condition.
One general rule: if your diarrhea is accompanied by a high fever or bloody stools, avoid loperamide until you’ve spoken with a doctor. In cases of bacterial infection, slowing the gut can trap the bacteria inside longer.
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 the CDC has noted that it’s unnecessarily restrictive and provides poor nutrition when your body needs fuel to recover. Withholding food for more than 24 hours actually slows gut healing. A better approach is to eat your normal diet with a few modifications.
Stick with foods that are easy to digest: plain rice, cooked potatoes, lean chicken, eggs, yogurt, oatmeal, and well-cooked vegetables. Yogurt is particularly helpful because it contains live cultures that support your gut’s microbial balance. Complex carbohydrates and lean proteins give your recovering intestine something useful to work with. Eat smaller meals more frequently rather than three large ones.
The foods that tend to make things worse fall into a few predictable categories:
- Dairy (except yogurt): Diarrhea can temporarily reduce your ability to digest lactose, so milk, ice cream, and soft cheese may worsen symptoms even if you’re not normally lactose intolerant.
- High-fructose foods: Apples, pears, dried fruits, fruit juice, and anything sweetened with high-fructose corn syrup can pull extra water into the intestine.
- Sugar alcohols: Sorbitol and xylitol, found in sugar-free gum and candy, are well-documented causes of diarrhea on their own.
- Caffeine: Coffee, tea, cola, and chocolate all stimulate the gut and increase diarrhea.
- Gas-producing vegetables: Beans, broccoli, Brussels sprouts, and cabbage add bloating and cramping on top of an already irritated digestive system.
- Carbonated drinks: The fizz creates gas in the GI tract, adding discomfort.
Probiotics Can Shorten the Episode
A specific probiotic yeast called Saccharomyces boulardii has the strongest evidence for acute diarrhea. Pooled data from clinical trials found it reduced diarrhea duration by roughly 20 hours compared to placebo. It works by competing with harmful bacteria for space on the intestinal wall and by supporting the gut’s immune response. You can find it in capsule form at most pharmacies, often labeled as “S. boulardii” or sold under brand names like Florastor.
Other probiotic strains, particularly Lactobacillus-based products, have shown more mixed results. If you’re choosing a probiotic specifically for diarrhea, S. boulardii is the better bet. Start taking it at the onset of symptoms rather than waiting, since the benefit comes from shortening the overall episode.
Red Flags That Need Medical Attention
Most diarrhea is a nuisance, not a danger. But certain signs mean your body isn’t coping well or something more serious is going on. For adults, seek medical care if:
- Diarrhea lasts more than two days without any improvement
- You notice blood or black color in your stool
- You develop a fever above 102°F (39°C)
- You have severe abdominal or rectal pain
- You show signs of dehydration: excessive thirst, very dark urine, little or no urination, dizziness, or severe weakness
For young children, the timeline is tighter. A child whose diarrhea hasn’t improved within 24 hours, who hasn’t had a wet diaper in three or more hours, or whose skin doesn’t bounce back when gently pinched needs prompt medical evaluation. Severe diarrhea, defined as more than 10 bowel movements a day or fluid losses clearly exceeding what you can drink, warrants an emergency visit regardless of age.
Protecting Your Gut After Recovery
Once the diarrhea stops, your gut isn’t fully back to normal. The intestinal lining takes time to regenerate, and the balance of bacteria in your digestive system has been disrupted. Some people develop lingering symptoms, a condition called post-infectious irritable bowel syndrome, which can include intermittent cramping, bloating, or alternating constipation and diarrhea for weeks or months after the original illness clears.
There’s no guaranteed way to prevent this, but reintroducing foods gradually helps. Keep eating yogurt or taking probiotics for a week or two after symptoms resolve. Avoid jumping straight back into greasy, heavily processed, or high-sugar meals. Your gut will signal when it’s ready for your full normal diet. If digestive symptoms linger beyond a few weeks, that’s worth discussing with a healthcare provider rather than assuming it will sort itself out.