Most cases of diarrhea clear up on their own within one to three days. What you do during that window, especially how you hydrate and what you eat, makes a real difference in how quickly you recover and how miserable you feel in the meantime. The basics: replace lost fluids, eat easy-to-digest foods, and use over-the-counter options strategically if needed.
Replace Fluids Before Anything Else
Diarrhea pulls water and electrolytes out of your body fast. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing with every trip to the bathroom. If your urine is dark yellow or you’re not urinating much, you’re already behind on fluids.
The most effective rehydration drink is simple to make at home using the World Health Organization’s formula: 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 gut that pulls sodium and water back into your body far more efficiently than water alone. Sip this steadily throughout the day rather than gulping it down.
If that mixture doesn’t appeal to you, a broth-based version works well too. Dissolve a regular-sodium bouillon cube in four cups of water with a quarter teaspoon of salt and two tablespoons of sugar. Store-bought electrolyte drinks are another option, though many contain more sugar than you need. Avoid fruit juice, soda, and sports drinks as your primary fluids. They tend to be high in fructose, which can actually pull more water into your intestines and make diarrhea worse.
What to Eat (and What to Skip)
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s fine for the first day or two, but there’s no actual research showing it works better than simply eating bland, easy-to-digest foods. Restricting yourself to just those four items for too long means missing out on the protein and nutrients your body needs to recover.
A better approach is to start with gentle foods and expand as your stomach settles. Good early choices include brothy soups, oatmeal, boiled potatoes, crackers, and unsweetened dry cereal. Once things calm down, add cooked carrots, sweet potatoes without skin, avocado, skinless chicken or turkey, fish, and eggs. These are all bland enough to be tolerated but nutritious enough to support your recovery.
Equally important is what you avoid. Three categories of food tend to make diarrhea worse:
- High-fructose foods and drinks: Peaches, pears, cherries, apples, applesauce, soda, and juice beverages. Most people who consume more than 40 to 80 grams of fructose per day will develop diarrhea even when they’re healthy.
- Sugar alcohols: Sorbitol, mannitol, and xylitol are common in sugar-free gum, candy, and some medications. They draw water into the intestines and can significantly worsen loose stools.
- Caffeine: Coffee, tea, chocolate, and many sodas speed up your digestive system, which is the last thing you need right now.
Dairy, greasy foods, and high-fiber vegetables are also worth avoiding until you’re fully back to normal.
Over-the-Counter Options That Help
Loperamide (the active ingredient in Imodium) works by slowing down the movement of your intestines, giving them more time to absorb water. The standard approach for adults is to take two tablets after the first loose stool, then one tablet after each additional loose stool. Don’t exceed four tablets in 24 hours with the standard tablet form.
Bismuth subsalicylate (the active ingredient in Pepto-Bismol) is another option. It can reduce the frequency of loose stools and help with the cramping and nausea that often come along with diarrhea. However, it’s not appropriate for everyone. Don’t give it to children under 12, and children or teenagers recovering from the flu or chickenpox should avoid it entirely due to the risk of a rare but serious condition called Reye’s syndrome. People who are breastfeeding, have kidney disease, gout, bleeding disorders, or stomach ulcers should also avoid it.
One important rule for both medications: don’t use them if you have a fever above 100.4°F (38°C) or if your stools contain blood. Those signs suggest an infection your body needs to fight off, and slowing your gut down can interfere with that process.
Probiotics Can Shorten Recovery
Certain probiotic strains genuinely speed up recovery from acute diarrhea. The best-studied is Saccharomyces boulardii, a beneficial yeast available over the counter in most pharmacies. A large analysis of clinical trials found it reduced the duration of diarrhea by roughly one to two days compared to no treatment. People taking it also had significantly fewer stools per day by day three (about two per day versus three in the untreated group) and experienced fewer side effects than those on standard treatment alone.
The effect was strongest for diarrhea caused by rotavirus, where the reduction in duration averaged about two days. S. boulardii also appeared to lower levels of inflammatory compounds in the gut, which may explain why it helps with cramping and discomfort alongside the diarrhea itself. Look for it by name on the label, as not all probiotics have the same evidence behind them.
How Long Diarrhea Typically Lasts
Viral gastroenteritis, the most common cause, usually resolves within one to three days. Norovirus, the single most frequent culprit, follows this timeline closely. Food poisoning from bacteria like salmonella can take a bit longer, sometimes five to seven days, though mild cases often wrap up sooner. Traveler’s diarrhea typically runs three to five days without treatment.
If your diarrhea lasts more than three days with no improvement, that’s worth paying attention to. The same goes for a fever above 100.4°F, blood or mucus in your stool, signs of dehydration you can’t correct by drinking (dizziness, dry mouth, very little urine output), or severe abdominal pain. Older adults should be especially cautious, as the fluid loss from diarrhea can escalate quickly in that age group.