Most cases of diarrhea clear up on their own within two to three days, but what you do in the meantime makes a real difference in how quickly you recover and how miserable you feel. The priority is replacing lost fluids, choosing the right foods, and knowing when over-the-counter options can help.
Start With Fluids, Not Food
Diarrhea drains water, salt, and potassium from your body fast. Dehydration is the main danger, not the diarrhea itself. Plain water alone isn’t ideal because it lacks the electrolytes your gut needs to actually absorb the fluid. There’s a reason behind this: your intestines pull water in alongside sodium and glucose. When both are present in the right ratio, water absorption increases dramatically, even through an inflamed gut lining. That’s the entire science behind oral rehydration solutions.
You can make one at home using the World Health Organization recipe: mix half a teaspoon of salt and two tablespoons of sugar into about four cups of clean water. Sip it steadily rather than gulping it down. If you don’t want to mix your own, store-bought options like Pedialyte or similar electrolyte drinks work well. Avoid sports drinks with high sugar content, as excess sugar can actually pull more water into the intestines and worsen diarrhea.
Signs you’re getting dehydrated include dark urine, a dry mouth, dizziness when standing, and skin that stays pinched up for a moment instead of snapping back flat. If you notice these, increase your fluid intake immediately.
What to Eat (and What to Skip)
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s been a go-to recommendation for decades, but infectious disease guidelines now say there’s limited evidence it actually speeds recovery. The current recommendation is to return to a normal, balanced diet as soon as you feel up to it, rather than restricting yourself to bland foods for days. Fasting for 24 hours doesn’t appear to help either.
That said, some foods will genuinely make things worse. The biggest culprits are sugar alcohols, which are found in sugar-free gum, diet candies, protein bars, and many “no sugar added” products. Common ones include sorbitol, xylitol, maltitol, and mannitol. Your body can’t fully digest them, so they sit in your intestines, pull in water, and ferment. The FDA actually requires products containing sorbitol or mannitol to carry a warning that excessive consumption can cause a laxative effect. When you already have diarrhea, even small amounts can keep it going.
Other things worth avoiding until you’re feeling better: caffeine (stimulates the gut), alcohol (dehydrating), greasy or fried foods (hard to digest), and dairy if you notice it makes things worse. High-fructose foods like fruit juice and honey can also draw extra water into the intestines.
Over-the-Counter Medications That Help
Two main options are available without a prescription. Loperamide (sold as Imodium) slows down intestinal contractions, giving your gut more time to absorb water. It works well for acute, uncomplicated diarrhea. Adults can take up to 8 mg per day with the tablet form (four tablets in 24 hours). It should not be used in children under 2, and children under 6 should only take it under a doctor’s guidance.
Bismuth subsalicylate (sold as Pepto-Bismol) takes a different approach. It reduces inflammation in the intestinal lining and has mild antimicrobial properties. It’s a reasonable choice for milder symptoms or traveler’s diarrhea.
One important note: if your diarrhea comes with a high fever or bloody stools, skip loperamide. In those cases, your body may be trying to flush out a bacterial infection, and slowing that process down can make things worse.
Probiotics and Recovery Time
Certain probiotic strains can shorten a bout of diarrhea. The best-studied one, Lactobacillus rhamnosus GG, reduced the duration of acute diarrhea by roughly 19 hours in a clinical trial comparing it to standard care alone. It also cut hospital stays by nearly a full day. Another commonly recommended strain, Saccharomyces boulardii (a beneficial yeast), showed less convincing results in the same trial.
If you want to try probiotics, look for products that list the specific strain on the label rather than just the species name. Yogurt with live cultures can contribute some beneficial bacteria, but dedicated probiotic supplements deliver higher, more targeted doses. Start them as early as possible in the illness for the best effect.
Special Considerations for Children
Children dehydrate faster than adults, so fluid replacement is even more critical. Breastfed infants should continue nursing throughout the illness. For older children, oral rehydration solutions are the first line of defense, not juice or soda.
The WHO 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 helps restore the intestinal lining and has been shown to reduce both the severity and duration of episodes. This is particularly relevant in areas where zinc deficiency is common, but it’s worth discussing with your child’s pediatrician regardless.
When Diarrhea Signals Something Bigger
Most diarrhea is caused by a virus and resolves quickly. But certain patterns suggest something more serious. Diarrhea lasting more than three days without improvement, blood or mucus in your stool, fever above 102°F (39°C), severe abdominal pain, or signs of significant dehydration all warrant medical attention.
Chronic or recurring diarrhea, lasting weeks rather than days, can point to food intolerances (especially lactose or gluten), irritable bowel syndrome, inflammatory bowel disease, or medication side effects. Antibiotics are a particularly common trigger because they disrupt the balance of gut bacteria. If your symptoms started after beginning a new medication, that connection is worth raising with your provider.