Most cases of acute diarrhea resolve on their own within two to three days with the right combination of fluids, simple foods, and rest. The key is replacing what your body is losing, choosing foods that won’t make things worse, and knowing when an over-the-counter remedy can safely speed things along. Here’s how to get through it.
Start With Fluids, Not Food
Diarrhea pulls water and electrolytes out of your body fast. Replacing those losses is more important than eating solid food in the first several hours. Plain water alone isn’t ideal because it lacks the sodium and potassium your gut is shedding with every loose stool. The combination of a small amount of sugar, salt, and water actually enhances absorption of fluid in the intestines, which is why oral rehydration solutions work better than water by itself.
You can make a simple rehydration drink at home: combine 4 cups of water with half a teaspoon of table salt and 2 tablespoons of sugar. Sip it steadily rather than gulping it down. If you’d rather not mix your own, chicken broth (not the low-sodium kind) with 2 tablespoons of sugar stirred in works similarly. Coconut water is naturally high in potassium and can also help, though it’s lower in sodium than an ideal rehydration mix. Sports drinks like Gatorade G2 with an extra half teaspoon of salt per 32-ounce bottle are another option.
Avoid coffee, alcohol, and full-strength fruit juice. Caffeine stimulates the gut, alcohol dehydrates you further, and the high sugar concentration in undiluted juice can actually pull more water into the intestines and worsen diarrhea.
What to Eat (and What to Skip)
Once you feel ready to eat, stick with foods that are low in fat, low in fiber, and easy to digest. You’ve probably heard of the BRAT diet (bananas, rice, applesauce, toast), but you don’t need to limit yourself to just those four items. Potatoes, crackers, plain pasta, roasted chicken without the skin, smooth nut butter, low-fat yogurt, and well-cooked vegetables are all reasonable choices. The goal is bland, soft food that won’t irritate an already inflamed gut.
What matters just as much is what you avoid. Spicy food, fried food, red meat, cream-based dishes, raw vegetables, and sugary snacks like cookies or candy can all trigger more cramping and loose stools. Full-fat dairy tends to be harder to digest during a bout of diarrhea, even for people who normally tolerate it fine. Stick with the boring stuff for a day or two, then gradually reintroduce your normal diet as stools firm up.
Over-the-Counter Remedies
Two main options sit on pharmacy shelves for acute diarrhea. Loperamide (the active ingredient in Imodium) works by slowing the movement of your intestines, giving them more time to absorb water. It’s the faster-acting option and is effective at a daily limit of 8 mg for adults. Bismuth subsalicylate (Pepto-Bismol) takes a different approach, reducing inflammation and the amount of fluid your intestines secrete. It tends to work more gradually.
There’s an important safety rule here: do not take loperamide if you have a high fever alongside diarrhea, if you see blood in your stool, or if the diarrhea started after a course of antibiotics. These can be signs of a bacterial infection where slowing down the gut actually traps the harmful bacteria inside, potentially making things much worse. Bismuth subsalicylate is generally the safer choice when you’re unsure of the cause, but if any of those red flags are present, skip the self-treatment entirely.
Probiotics During Recovery
Probiotics can shorten the duration of diarrhea, but timing matters. Research on one of the most studied strains shows that starting probiotics early, within the first day or two of symptoms, is when they’re most likely to help. A large clinical trial that enrolled people up to 72 hours after their diarrhea began found no benefit, likely because treatment started too late for the probiotics to make a difference.
Look for products containing well-studied strains, and start them alongside your rehydration efforts rather than waiting to see if things improve on their own. Probiotics are not a replacement for fluids, but they can be a useful add-on, particularly for children (with a pediatrician’s guidance).
Soluble Fiber for Firming Up Stools
This one seems counterintuitive, since fiber is often associated with loosening things up. But soluble fiber, particularly psyllium husk, has a dual action: it softens hard stools in constipation and firms up liquid stools in diarrhea. It works by absorbing excess water in the intestines and adding bulk.
The catch is that psyllium needs to be taken with plenty of water to work properly. Research published in the Journal of the Academy of Nutrition and Dietetics found that higher doses (20 to 25 grams) taken with at least 500 mL of water produced the strongest stool-normalizing effects, though even smaller amounts of 7 to 14 grams daily offer some benefit. Start on the lower end if your stomach is still sensitive, and always drink a full glass of water with each dose.
Watching for Dehydration
For most adults, the biggest risk from a few days of diarrhea isn’t the diarrhea itself. It’s dehydration. Signs to watch for include a dry mouth, dark urine, dizziness when standing, and urinating much less frequently than usual.
Children and infants dehydrate faster and show different warning signs. Mild to moderate dehydration in a child looks like fewer than six wet diapers per day, a dry mouth, fewer tears when crying, and less playfulness than normal. In infants, a sunken soft spot on the top of the head is a specific indicator. Severe dehydration brings more alarming signs: excessive sleepiness, sunken eyes, cool or discolored hands and feet, wrinkled skin, and urinating only once or twice a day. Severe dehydration in a child needs immediate medical attention.
When Diarrhea Needs More Than Home Care
Diarrhea that lasts longer than two weeks is considered persistent and often involves different types of pathogens than the typical stomach bug. At that point, self-treatment is unlikely to resolve the problem. Seek medical care sooner if you notice blood in your stool, a fever above 102°F, signs of severe dehydration, or diarrhea so intense that it completely prevents you from carrying out normal activities. Any of these point to a potentially invasive infection that needs proper evaluation rather than another dose of Imodium.