Most cases of diarrhea resolve on their own within two to four days. The fastest way to stop it is a combination of staying hydrated, eating the right foods, and using an over-the-counter medication if needed. What you avoid putting into your body matters just as much as what you take.
Stay Hydrated First
Diarrhea pulls water and electrolytes out of your body fast. Dehydration is the main risk, not the diarrhea itself. If you’re urinating less than usual or your skin feels slow to bounce back when you pinch it, you’re already behind on fluids.
Water alone isn’t ideal because it doesn’t replace lost sodium and potassium. Oral rehydration solutions (sold at any pharmacy) work best. You can also alternate between water, broth, and diluted juice. Sip steadily rather than gulping large amounts at once, which can trigger more cramping. For young children, no wet diapers for three hours or more is a sign of significant dehydration that needs medical attention quickly.
Over-the-Counter Medications That Work
Two common options sit on pharmacy shelves, and they work differently.
Loperamide (the active ingredient in Imodium) slows your intestinal muscles, giving your gut more time to absorb water. The standard dose is 4 mg to start, then 2 mg after each loose stool, up to 8 mg total per day for over-the-counter use. It’s effective and fast-acting for garden-variety diarrhea. Do not use it if you have bloody stools, a high fever, or suspect a bacterial infection. In those situations, slowing the gut down can trap the pathogen inside and make things worse.
Bismuth subsalicylate (the active ingredient in Pepto-Bismol) takes a different approach. It reduces inflammation in the gut lining, blocks excess fluid secretion, and has mild antibacterial properties. It’s gentler than loperamide and also helps with nausea and cramping. Avoid it if you take blood thinners, are allergic to aspirin, or have bleeding problems. Children and teenagers recovering from the flu or chickenpox should not take it due to a small risk of Reye’s syndrome.
What to Eat (and What to Skip)
You may have heard of the BRAT diet: bananas, rice, applesauce, toast. It’s been a home remedy for decades, but no clinical trials have ever confirmed it works. In fact, the American Academy of Pediatrics, the CDC, and the WHO all recommend eating a normal, balanced diet as soon as you can tolerate food. Restricting yourself to just those four foods provides roughly 300 fewer calories per day than a normal diet and falls short on protein and fat, which can slow your recovery.
That said, some individual BRAT foods are still reasonable choices. Bananas replenish potassium. White rice is easy to digest. The key is not to limit yourself to only bland, low-calorie foods. Eat what you normally eat, prioritizing simple meals: chicken and rice, scrambled eggs, oatmeal, soup, cooked vegetables. If something sits well, keep eating it.
What you should actively avoid:
- Sugar alcohols. Sorbitol, mannitol, xylitol, and maltitol are found in sugar-free gum, candies, and many “diet” products. They have a well-documented laxative effect. As little as 5 grams of sorbitol can cause gas, bloating, and urgency. A single pack of sugar-free gum can contain over 20 grams, enough to cause diarrhea on its own. Check labels on anything marked “sugar-free.”
- High-fat and greasy foods. Fat speeds up gut contractions, which is the last thing you need.
- Dairy. Temporary lactose intolerance is common after a bout of diarrhea because the enzyme that digests milk sugar sits on the tips of intestinal cells that get damaged first.
- Caffeine and alcohol. Both increase fluid loss and stimulate the gut.
- Certain fruits. Apples, pears, peaches, prunes, and dried fruits are naturally high in sorbitol and can worsen symptoms.
Probiotics Can Shorten Recovery
The probiotic yeast Saccharomyces boulardii has the strongest evidence for acute diarrhea. Pooled data from clinical trials shows it reduces diarrhea duration by roughly 20 hours compared to no treatment. By day three, people taking it were about 60% less likely to still have diarrhea. You can find it in supplement form at most pharmacies. Other well-studied probiotic strains include certain Lactobacillus species, though the evidence is strongest for S. boulardii specifically.
Probiotics work best when started early. They’re not a replacement for hydration or medication in severe cases, but they’re a useful addition, especially for antibiotic-associated diarrhea or traveler’s diarrhea.
Traveler’s Diarrhea May Need Antibiotics
If diarrhea hits during or shortly after international travel, it’s often bacterial. Mild cases can be managed with loperamide or bismuth subsalicylate alone. Moderate to severe cases, especially with fever or blood in the stool, typically require antibiotics.
The CDC considers azithromycin the preferred treatment for severe traveler’s diarrhea and for any case involving fever or bloody stools. It’s also the go-to choice for travel in Southeast Asia, where antibiotic-resistant bacteria are common. Fluoroquinolones, once the default, are losing ground because of rising resistance. A third option, rifaximin, works for moderate cases caused by noninvasive bacteria but shouldn’t be used when an invasive infection is suspected. If you’re planning travel to a high-risk area, ask your doctor about carrying a course of antibiotics before you leave.
Zinc for Children
The World Health Organization recommends zinc supplementation for children with diarrhea: 20 mg per day for 10 to 14 days (10 mg per day for infants under six months). Zinc helps restore the intestinal lining and reduces the duration and severity of episodes. This recommendation is most relevant in low- and middle-income countries where zinc deficiency is common, but it applies broadly to pediatric diarrhea management.
Signs That Need Medical Attention
Most diarrhea is self-limiting and uncomfortable but not dangerous. Certain patterns, however, signal something more serious:
- Blood or black color in the stool
- Fever above 102°F (39°C)
- Diarrhea lasting more than two days in adults, or more than 24 hours in young children
- Signs of dehydration like very dark urine, dizziness, dry mouth, or skin that stays “tented” when pinched
- Severe abdominal or rectal pain
Bloody or fever-accompanied diarrhea may indicate a bacterial infection that needs targeted treatment rather than symptom management. In those cases, using loperamide alone can delay recovery.