Most cases of diarrhea in adults resolve within a few days with the right combination of fluids, simple foods, and sometimes an over-the-counter medication. The priority is replacing lost fluid and electrolytes, then easing symptoms while your gut recovers. Here’s what actually works and what to skip.
Fluids Come First
Diarrhea pulls water and essential minerals out of your body fast. Replacing them is the single most important thing you can do. Water alone isn’t ideal because it doesn’t contain the sodium and potassium your body is losing with each loose stool. Better options include oral rehydration solutions (available at any pharmacy), clear broths, and diluted fruit juices. Sports drinks work in a pinch, though they contain more sugar than medical rehydration formulas.
Sip steadily throughout the day rather than gulping large amounts at once, which can trigger more cramping. You’ll know you’re falling behind on fluids if your mouth feels dry, your urine turns dark yellow, or you feel dizzy when you stand up. Pinch the skin on the back of your hand: if it doesn’t snap back flat right away, that’s another sign of significant fluid loss.
What to Eat (and What to Avoid)
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, toast. It’s a reasonable starting point for the first day or two, but there’s no clinical evidence that restricting yourself to only those four foods speeds recovery. Brothy soups, oatmeal, boiled potatoes, crackers, and unsweetened dry cereals are equally gentle on the stomach and give you a wider range of nutrients.
Once your stomach settles, start adding back foods with more protein and vitamins. Cooked carrots, sweet potatoes without skin, skinless chicken or turkey, fish, eggs, avocado, and cooked squash like butternut or pumpkin are all bland enough to digest easily while providing what your body needs to heal. Staying on a very restricted diet for more than a couple of days can actually slow recovery by depriving you of calories and protein.
Certain foods and drinks reliably make diarrhea worse. High-sugar foods and beverages draw extra water into the intestines, making stools more watery. Sugar alcohols (sorbitol, xylitol, mannitol), found in sugar-free gum and candy, have the same effect. Skip caffeine and alcohol, both of which speed up gut motility and worsen dehydration. Greasy, fried, or heavily spiced foods are harder to digest and best avoided until things calm down. Dairy can be a problem too, since temporary lactose intolerance is common after a bout of intestinal illness.
Over-the-Counter Medications That Work
Two widely available medications can reduce the frequency and urgency of diarrhea in adults.
Loperamide (the active ingredient in Imodium) slows down the movement of your intestines, giving them more time to absorb water. The recommended starting dose for adults is 4 mg (two capsules), followed by 2 mg (one capsule) after each unformed stool, up to a maximum of 16 mg (eight capsules) in 24 hours. It works well for watery, non-bloody diarrhea. Avoid it if you have a high fever or blood in your stool, since in those situations slowing the gut down can trap an infection inside.
Bismuth subsalicylate (the active ingredient in Pepto-Bismol) takes a different approach. Its salicylate component reduces inflammation and fluid secretion in the intestinal lining, while the bismuth portion has a mild antibacterial effect. This combination makes it useful for both infectious diarrhea and general stomach upset. It can turn your tongue and stool black temporarily, which is harmless. Anyone allergic to aspirin should avoid it, since salicylate is chemically related.
Do Probiotics Help?
Certain probiotic strains can shorten a bout of diarrhea, though the effect is modest. The best-studied strain for acute diarrhea is Saccharomyces boulardii, a beneficial yeast. Pooled data from clinical trials found it reduced diarrhea duration by roughly 20 hours compared to no treatment. That’s meaningful when you’re miserable, but it’s not a dramatic overnight fix.
Look for products that list the specific strain on the label and contain at least a few billion colony-forming units (CFUs). Generic “probiotic blend” supplements may not contain the strains with actual evidence behind them. Yogurt with live cultures is a reasonable food-based option, though the dose of beneficial organisms is lower than what you’d get in a supplement.
Simple Habits That Speed Recovery
Rest matters more than people expect. Your body is fighting off whatever triggered the episode, and physical activity speeds up gut transit, which is the opposite of what you want. Eat smaller meals more frequently rather than three large ones. Large meals stretch the stomach and trigger stronger contractions in the intestines.
Warm, salty broths do double duty: they replace sodium and provide easy calories. If plain water is all you have, add a small pinch of salt and a teaspoon of sugar per glass to create a basic rehydration solution. This simple mixture helps your intestines absorb the fluid more efficiently than water alone.
Warning Signs That Need Medical Attention
Most adult diarrhea clears up on its own, but certain patterns signal something more serious. Contact a doctor if your diarrhea lasts longer than two days without improving, if you’re passing six or more loose stools per day, or if you develop a high fever. Blood or pus in your stool is always a reason to get evaluated promptly.
Pay close attention to signs of dehydration: extreme thirst, dark urine, dizziness or lightheadedness, feeling unusually tired, sunken-looking eyes, and skin that stays tented when pinched. Older adults and people with chronic conditions are especially vulnerable to fluid losses and should have a lower threshold for seeking help. Dehydration that progresses beyond mild can affect your kidneys and heart, so don’t try to push through it if fluids aren’t staying down.