For most cases of acute diarrhea, the right combination of fluids, simple foods, and possibly an over-the-counter medication will resolve things within a day or two. The two main OTC options are loperamide (Imodium) and bismuth subsalicylate (Pepto-Bismol), and what you eat and drink during a bout matters just as much as what you take from the medicine cabinet.
Fluids Come First
Diarrhea pulls water and electrolytes out of your body fast, so replacing them is the single most important thing you can do. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing. Oral rehydration solutions, clear broths, and diluted fruit juices are better choices. Sports drinks work in a pinch, though they tend to be high in sugar, which can actually make loose stools worse in some people.
Sip steadily rather than gulping large amounts at once. If you’re urinating very little, your mouth feels dry, you feel dizzy, or your urine is dark, you’re already significantly dehydrated and need to increase your fluid intake right away.
Loperamide (Imodium)
Loperamide slows the muscle contractions in your intestines, giving your body more time to absorb water and firm up stool. It’s the most effective OTC option for stopping frequent, watery bowel movements quickly. The standard adult dose is two capsules (4 mg) after the first loose stool, then one capsule (2 mg) after each subsequent loose stool, up to a maximum of eight capsules (16 mg) in a day.
A few important caveats: don’t use loperamide if you have a high fever or bloody stools, because in those cases the diarrhea may be your body’s way of clearing a bacterial infection, and slowing that process down can make things worse. It should not be given to children under 2 years old. For children ages 6 to 12, doses are lower and weight-based, so check the package instructions carefully.
Bismuth Subsalicylate (Pepto-Bismol)
Bismuth subsalicylate works differently from loperamide. It has antibacterial properties, reduces inflammation in the gut lining, and decreases the amount of fluid your intestines secrete. This makes it particularly useful for traveler’s diarrhea and food poisoning, where bacteria or their toxins are part of the problem. It also helps with the nausea and cramping that often come along with diarrhea.
There are some people who should avoid it entirely. Because it contains a compound related to aspirin, you shouldn’t take it if you have an aspirin allergy, if you’re already taking aspirin or blood thinners, or if you’re pregnant or breastfeeding. Children and teenagers recovering from chickenpox or flu should also avoid it due to a rare but serious risk. It can also block the absorption of certain antibiotics, so check with a pharmacist if you’re on other medications. One harmless but startling side effect: it can temporarily turn your tongue and stool black.
What to Eat During a Bout
The classic advice is the BRAT diet: bananas, rice, applesauce, and toast. These foods are bland, low in fiber, and easy on an irritated gut. That said, there’s no clinical evidence that restricting yourself to only those four foods speeds recovery. Harvard Health notes it’s reasonable to follow BRAT for a day or two, but you should start adding more nutritious options as soon as your stomach settles. Cooked carrots, sweet potatoes without skin, skinless chicken or turkey, fish, eggs, avocado, and cooked squash like butternut or pumpkin are all gentle on the digestive system while providing the protein and nutrients your body needs to recover.
The bigger priority is knowing what to avoid. Dairy products, greasy or fried foods, and high-fiber raw vegetables can all make diarrhea worse. Sugar alcohols like sorbitol and xylitol, found in sugar-free gums and candies, are known to cause or worsen diarrhea. High-fructose corn syrup, common in soft drinks and processed snacks, can have the same effect. Caffeine and alcohol are both dehydrating and can stimulate your intestines, so skip them until you’ve fully recovered.
Ginger and Other Home Remedies
Ginger has a long history of use for digestive complaints. It appears to reduce intestinal spasms, which can ease cramping and slow the urgency to go. Some research suggests it affects neurotransmitters involved in gut motility, though most of the evidence is from animal studies rather than large human trials. Still, ginger tea or small amounts of fresh ginger are unlikely to cause harm and may take the edge off symptoms. Chamomile tea is another traditional option with mild anti-inflammatory properties, and at minimum it contributes to your fluid intake.
Diarrhea in Children
Children dehydrate faster than adults, so fluid replacement is even more critical. For young children, oral rehydration solutions designed for kids are the best choice. The World Health Organization recommends zinc supplementation for children with acute diarrhea: 20 mg per day for 10 to 14 days, or 10 mg per day for infants under six months. Zinc has been shown to reduce the duration and severity of diarrhea episodes in children.
Seek medical attention for a child whose diarrhea doesn’t improve within 24 hours, who hasn’t had a wet diaper in three or more hours, who has a fever above 102°F, or who has bloody or black stools.
Signs That Need Medical Attention
Most diarrhea resolves on its own within two to three days. For adults, certain symptoms signal that something more serious may be going on: diarrhea lasting more than two days without any improvement, a fever above 102°F, bloody or black stools, severe abdominal or rectal pain, or signs of significant dehydration like extreme thirst, very dark urine, dizziness, or sunken-looking eyes. More than 10 bowel movements a day, or losing fluids faster than you can take them in, qualifies as severe diarrhea and warrants prompt medical care.