Most cases of diarrhea resolve within one to two days with simple home measures: staying hydrated, eating bland foods, and optionally using an over-the-counter medication. The single most important thing you can do is replace the fluids and electrolytes your body is losing, since dehydration is the main risk of any bout of diarrhea, not the diarrhea itself.
Replace Fluids Before Anything Else
Every loose stool pulls water and electrolytes out of your body faster than normal. If you’re having frequent watery stools, plain water alone isn’t enough because it doesn’t replace the sodium and potassium you’re losing. An oral rehydration solution (ORS) is the fastest way to correct that imbalance. You can buy premade versions like Pedialyte or DripDrop, or make one at home using the World Health Organization’s formula: half a teaspoon of salt and two tablespoons of sugar dissolved in one liter of water.
Sip steadily rather than gulping large amounts at once, especially if you’re also nauseous. Broth-based soups, coconut water, and diluted fruit juices (avoid apple juice, which can worsen diarrhea) are decent alternatives if you don’t have ORS on hand. Signs that you’re falling behind on fluids include dark urine, dry mouth, dizziness, and feeling unusually weak.
Over-the-Counter Medications That Help
Two widely available medications can slow diarrhea down while your body fights off whatever triggered it.
Loperamide (sold as Imodium) works by slowing the movement of your intestines, giving them more time to absorb water. The standard adult dose is two tablets (4 mg) after the first loose stool, then one tablet (2 mg) after each subsequent loose stool, up to a maximum of four tablets in 24 hours for the over-the-counter strength. It’s effective for garden-variety diarrhea, but you should avoid it if you have a high fever, bloody stools, or suspect a bacterial infection. In those situations, slowing your gut down can trap harmful bacteria inside rather than letting your body flush them out.
Bismuth subsalicylate (Pepto-Bismol, Kaopectate) takes a different approach. It reduces the flow of fluids into the bowel, calms intestinal inflammation, and has mild antibacterial properties. It’s gentler than loperamide and a reasonable first choice for milder episodes or traveler’s diarrhea. Expect your tongue and stools to turn black temporarily; that’s a harmless side effect of the bismuth.
What to Eat (and What to Avoid)
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s fine for a day or two, but there’s no clinical evidence that restricting yourself to only those four foods speeds recovery. A broader bland diet works just as well and gives your body more of the nutrients it needs to heal. Good options include brothy soups, oatmeal, boiled potatoes, crackers, and plain dry cereal.
Once your stomach settles, start adding foods with more nutritional value: cooked carrots, sweet potatoes without skin, avocado, skinless chicken or turkey, fish, and eggs. These are all easy to digest while providing the protein your body needs during recovery.
Equally important is knowing what makes diarrhea worse. Dairy products are a common culprit because your intestines temporarily produce less lactase (the enzyme that digests milk sugar) during a bout of gastroenteritis. Sugar-free gum and candy sweetened with sorbitol or xylitol pull extra water into your gut through osmotic pressure, essentially the same mechanism that causes diarrhea in the first place. High-fructose corn syrup, found in soft drinks and many processed foods, can have the same effect. Alcohol, caffeine, greasy foods, and high-fiber raw vegetables are also worth avoiding until things have fully normalized.
Probiotics Can Shorten Recovery
One specific probiotic yeast, Saccharomyces boulardii (sold as Florastor), has the strongest evidence for shortening acute diarrhea. A meta-analysis of five trials found that it reduced the duration of diarrhea by about one day compared to placebo. The typical adult dose is 500 mg once or twice daily, and a treatment course usually runs one to four weeks depending on the cause. It’s particularly useful for diarrhea caused by antibiotics, which disrupt the normal balance of gut bacteria.
Other probiotic strains like Lactobacillus rhamnosus GG show some benefit as well, though the evidence isn’t as consistent. If you’re going to try a probiotic, start it early in the illness rather than waiting several days.
Treating Diarrhea in Children
Children, especially infants, dehydrate much faster than adults. The priority is the same: fluid replacement. The CDC recommends giving 50 to 100 mL of oral rehydration solution per kilogram of body weight over two to four hours to replace lost fluids. As a simpler rule, children under 22 pounds should get 2 to 4 ounces of ORS after each episode of vomiting or diarrhea, while heavier children should get 4 to 8 ounces.
Over-the-counter antidiarrheal medications like loperamide are not recommended for infants and young children. These drugs carry risks of drowsiness, intestinal slowdown, and nausea that outweigh their benefits in small bodies. Continue breastfeeding or formula feeding throughout the illness. Withholding food doesn’t help and can actually delay recovery.
When Diarrhea Signals Something Serious
Most diarrhea is caused by a virus and clears up on its own. But certain patterns suggest something that needs medical attention. For adults, these include diarrhea lasting more than two days without improvement, a fever above 102°F (39°C), blood or black color in the stool, severe abdominal or rectal pain, signs of dehydration like no urination or extreme dizziness, and six or more loose stools per day.
For children, the timeline is tighter: diarrhea that doesn’t improve within 24 hours, any fever in infants, no wet diaper for three or more hours, or blood in the stool all warrant a call to the pediatrician. People who are pregnant, over 65, currently on antibiotics, or have a weakened immune system should stay in closer contact with their doctor during any bout of diarrhea, even a mild-seeming one.
Why Diarrhea Happens in the First Place
Understanding the mechanism can help you choose the right response. Diarrhea generally falls into a few categories. Osmotic diarrhea happens when something in your gut draws excess water in, like lactose in someone who’s lactose intolerant, or sugar alcohols in sugar-free candy. This type usually stops when you stop eating the trigger.
Secretory diarrhea occurs when your intestines are actively pumping fluid outward, often triggered by a toxin from bacteria or a virus. This type produces large-volume, watery stools and continues even if you stop eating. It’s the kind most commonly responsible for dehydration emergencies. Inflammatory diarrhea, seen in conditions like ulcerative colitis or certain bacterial infections, involves actual damage to the intestinal lining. It can produce stools containing mucus, blood, or pus, and typically comes with fever and abdominal pain.
For osmotic diarrhea, removing the trigger food is the treatment. For viral secretory diarrhea, hydration and time are the main tools. Inflammatory or bloody diarrhea often needs a doctor’s evaluation and sometimes antibiotics or other targeted treatment.