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 treatments can shorten that timeline and keep you comfortable. The two most important things you can do right away are replace lost fluids and, if you need fast relief, take loperamide (sold as Imodium), which outperforms other common options in head-to-head comparisons.
Replacing Fluids Comes First
Diarrhea pulls water and electrolytes out of your body quickly. Dehydration is the main reason diarrhea becomes dangerous rather than just unpleasant. One simple way to check your hydration: look at your urine. If it’s dark yellow or you’re urinating less often than usual, you need more fluids.
Water alone isn’t ideal because it doesn’t replace the sodium and potassium you’re losing. The World Health Organization’s oral rehydration solution, used globally for decades, works by combining a precise ratio of glucose and salts in water. The current formula calls for about 2.6 grams of salt, 13.5 grams of glucose, and 1.5 grams of potassium chloride per liter. You don’t need to mix this yourself. Packets of oral rehydration salts are available at most pharmacies, and drinks like Pedialyte follow a similar formulation. Broth-based soups, coconut water, and diluted fruit juice also help if you can’t get a dedicated rehydration product.
Sip steadily rather than gulping large amounts, especially if you’re also feeling nauseous. Small, frequent sips are easier on your stomach and absorb more efficiently.
Over-the-Counter Options
Loperamide (Imodium) is the most effective nonprescription treatment for acute diarrhea. It works by slowing the contractions of your intestines, giving your gut more time to absorb water from stool. In a clinical comparison against bismuth subsalicylate (Pepto-Bismol), loperamide significantly reduced the number of unformed bowel movements, controlled symptoms for longer after the first dose, and reached the point of the last unformed stool faster. Subjects also rated their overall relief higher with loperamide at the 24-hour mark.
Bismuth subsalicylate still has a place. It coats the lining of your digestive tract and has mild antibacterial properties, which can help with nausea and cramping alongside loose stools. It’s a reasonable choice for milder symptoms or traveler’s diarrhea when you want some relief without fully slowing your gut.
One important caveat: if your diarrhea is bloody or you have a high fever, skip loperamide until you’ve been evaluated. Slowing your intestines when a bacterial infection is involved can sometimes make things worse by trapping the pathogen inside.
What to Eat (and What to Skip)
The classic BRAT diet (bananas, rice, applesauce, toast) has been recommended for decades, but there’s no clinical research proving it works better than simply eating bland, easy-to-digest foods. It’s fine for the first day or two, but restricting yourself to just those four items limits your nutrition at a time when your body needs fuel to recover.
Better options include brothy soups, oatmeal, boiled potatoes, crackers, and unsweetened dry cereals. As your stomach settles, add foods with more nutritional value: cooked carrots, sweet potatoes without skin, butternut squash, avocado, skinless chicken or turkey, fish, and eggs. These are all gentle on your digestive system while providing the protein and vitamins you need.
Avoid dairy (except yogurt with live cultures), fatty or fried foods, caffeine, alcohol, and anything with artificial sweeteners like sorbitol, which can pull more water into your intestines and worsen symptoms.
Probiotics Can Shorten Recovery
Certain probiotic strains have solid clinical evidence behind them for acute diarrhea. Lactobacillus rhamnosus GG (often labeled LGG on supplement bottles) has been studied extensively. A systematic review found that LGG reduced the duration of diarrhea by roughly 24 hours on average. In trials focused on rotavirus, high-dose LGG cut diarrhea duration by about 31 hours and reduced the number of daily stools.
Saccharomyces boulardii, a beneficial yeast sold under brand names like Florastor, is another well-studied option. It’s particularly useful for preventing antibiotic-associated diarrhea.
Not all probiotic products are equal. Look for products that specify the strain (not just the species) and contain at least 10 billion colony-forming units per dose. Start taking them at the first sign of symptoms for the best results.
When Antibiotics Help (and When They Hurt)
Most diarrhea is caused by viruses, and antibiotics do nothing for viral infections. Antibiotics are only helpful when a specific bacterial pathogen is identified, typically Salmonella, Shigella, or Campylobacter. These infections usually come with fever, bloody stools, or both.
Ironically, antibiotics themselves are one of the most common causes of diarrhea. Up to 85% of people who develop C. difficile infection, a particularly stubborn and sometimes dangerous form of diarrhea, report taking antibiotics within the previous 28 days. The antibiotics most strongly linked to this problem include cephalosporins, clindamycin, and fluoroquinolones. If you develop diarrhea while taking or shortly after finishing antibiotics, that’s worth mentioning to your doctor.
Zinc for Children
For kids with diarrhea, zinc supplementation is a WHO-recommended treatment that many parents don’t know about. The guideline calls for 20 mg of zinc per day for 10 to 14 days for children over six months, and 10 mg per day for infants under six months. Zinc helps restore the intestinal lining and supports immune function, reducing both the severity and duration of the episode. It also lowers the risk of recurrence in the following two to three months.
Warning Signs That Need Medical Attention
Most diarrhea is a nuisance, not an emergency. But certain patterns signal something more serious. Blood or mucus in your stool, a fever above 102°F (39°C), signs of dehydration you can’t correct by drinking (dizziness when standing, no urination for eight or more hours, dry mouth), or diarrhea lasting longer than three days all warrant a call to your doctor. For young children, older adults, and anyone with a weakened immune system, the threshold for seeking care should be lower, since dehydration develops faster in these groups.