The fastest way to stop diarrhea is with loperamide (sold as Imodium), an over-the-counter medication that slows down intestinal movements and can reduce loose stools within an hour or two. But medication is only one piece. Staying hydrated matters just as much as stopping the symptoms, and what you eat during a bout can speed up or slow down your recovery.
Over-the-Counter Medications
Two main OTC options work well for most adults with acute diarrhea: loperamide and bismuth subsalicylate (Pepto-Bismol).
Loperamide works by slowing the muscles in your intestines, giving your body more time to absorb water from stool. The standard dose is two tablets (4 mg) after the first loose bowel movement, then one tablet (2 mg) after each subsequent one. Don’t exceed 8 tablets in 24 hours for the prescription-strength capsules, or 4 tablets for the standard OTC version. Most people notice improvement within a few hours.
Bismuth subsalicylate takes a different approach. It coats the lining of your stomach and intestines, reducing inflammation and killing some bacteria that cause diarrhea. It also helps with nausea and cramping. One important caution: bismuth subsalicylate contains a compound related to aspirin, which means children and teenagers recovering from the flu, chickenpox, or other viral infections should not take it due to the risk of Reye’s syndrome, a rare but serious condition affecting the brain and liver.
Neither medication should be used if you have bloody stools or a high fever, since these can signal an infection your body needs to fight off rather than slow down.
Prescription Options for Severe Cases
If OTC medications aren’t enough, doctors can prescribe stronger anti-diarrheal drugs. These work similarly to loperamide but are more potent and come with more side effects, including dizziness, drowsiness, and poor concentration. They’re not safe for children under 6 due to the risk of severe breathing problems. Alcohol makes the side effects significantly worse. These medications are reserved for cases where diarrhea is persistent and disruptive enough to justify the trade-offs.
Hydration Is the Priority
Diarrhea pulls water and electrolytes out of your body fast. Replacing them is critical, especially if you’re having frequent watery stools. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing.
The World Health Organization’s oral rehydration formula uses a specific 1:1 ratio of sodium to glucose because glucose helps your small intestine absorb sodium and water together. You can buy premade oral rehydration solutions at most pharmacies, or look for drinks that contain both sodium and a small amount of sugar. Sports drinks work in a pinch, though they contain more sugar than ideal. Avoid coffee, alcohol, and high-sugar fruit juices, which can make diarrhea worse.
For children, watch for signs of dehydration closely: no wet diaper in three or more hours, dry mouth, or no tears when crying. These signal the need for medical attention quickly.
What to Eat During a Bout
The old advice was to stick strictly to the BRAT diet: bananas, rice, applesauce, and toast. That guidance has softened. While those foods are gentle on an irritated gut, there’s no research showing they work better than other bland options, and restricting yourself to just four foods means you’re missing protein and nutrients your body needs to recover.
A better approach: eat bland, easy-to-digest foods for the first day or two, then expand. Good options include brothy soups, oatmeal, boiled potatoes, crackers, unsweetened dry cereal, cooked carrots, sweet potatoes without skin, and avocado. Once your stomach settles, add lean protein like skinless chicken, turkey, fish, or eggs. These give your body the building blocks it needs to heal while staying gentle on your digestive system.
Avoid greasy, spicy, or high-fiber foods until your stools normalize. Dairy can be tricky too, since diarrhea temporarily reduces your ability to digest lactose.
Probiotics Can Shorten Recovery
Probiotics won’t stop diarrhea immediately the way loperamide does, but they can cut the duration of an episode by roughly 30 hours on average, according to a Cochrane review of clinical trials. They work by restoring the balance of healthy bacteria in your gut, which gets disrupted during infections.
Two strains have the strongest evidence behind them. Lactobacillus rhamnosus GG (often labeled LGG) is particularly effective for viral stomach bugs. In studies of children with rotavirus, it reduced stool frequency significantly by day three and cut the chance of diarrhea lasting three or more days by nearly 80%. Saccharomyces boulardii, a beneficial yeast rather than a bacterium, also performed well. It reduced the risk of diarrhea lasting four or more days by about 60%.
Look for these specific strains on the label. Generic “probiotic blend” products may not contain the strains that have actual evidence for diarrhea.
Herbal Teas That May Help
Several teas can soothe digestive discomfort alongside other treatments. Chamomile tea may help relax the muscles of your digestive tract and ease cramping, gas, and nausea. Peppermint tea has stronger evidence for relaxing intestinal muscles and relieving pain, particularly in people with irritable bowel syndrome. Green tea extract showed promise in one study for improving diarrhea and shortening recovery time in children with viral stomach flu.
Black tea is worth noting too. A study in 120 children with diarrhea found that a black tea supplement improved the volume, frequency, and consistency of bowel movements. Ginger tea may support gut health overall, though research hasn’t found a direct effect on bowel function during acute episodes. These teas are gentle additions, not replacements for rehydration or medication when you need them.
Zinc Supplements for Children
The WHO recommends zinc supplementation for children with diarrhea: 20 mg per day for children over six months, or 10 mg per day for younger infants, continued for 10 to 14 days. Zinc has been shown to reduce both the duration and severity of diarrheal episodes, and it lowers the risk of recurrence for two to three months afterward. This recommendation is especially relevant in developing countries where zinc deficiency is common, but it can benefit any child with prolonged diarrhea.
Warning Signs That Need Medical Attention
Most diarrhea resolves on its own within a couple of days. But certain symptoms mean you should see a doctor rather than managing things at home. For adults, these include: diarrhea lasting more than two days without improvement, signs of dehydration (excessive thirst, very dark urine, dizziness, little or no urination), severe abdominal or rectal pain, bloody or black stools, or a fever above 102°F (39°C). Severe diarrhea, defined as more than 10 bowel movements a day or fluid losses that outpace what you can drink, also warrants urgent care.
For children, the timeline is shorter. Diarrhea that doesn’t improve within 24 hours, a fever over 102°F, bloody or black stools, or signs of dehydration like no wet diaper for three hours or more all call for prompt medical evaluation.