Most cases of acute diarrhea resolve on their own within two to three days, but you can speed recovery and reduce discomfort with a combination of fluid replacement, dietary changes, and over-the-counter medication. The priority, in order, is to prevent dehydration, avoid foods that make things worse, and let your gut heal.
Replace Fluids First
Diarrhea pulls water and electrolytes out of your body fast. Severe cases, defined as more than 10 bowel movements a day or fluid losses that outpace what you’re drinking, can cause dangerous dehydration. You don’t need to wait until you feel thirsty to start replacing fluids.
Water alone isn’t ideal because it doesn’t replace lost sodium and potassium. Oral rehydration solutions (sold at any pharmacy) are the gold standard, but you can also alternate water with clear broths and diluted fruit juices. Sip steadily rather than gulping large amounts, which can trigger more cramping. Signs you’re falling behind on fluids include dark urine, dry mouth, dizziness, and producing little or no urine.
Over-the-Counter Medications That Help
Loperamide is the most widely used antidiarrheal. It works by slowing the movement of your intestines and reducing the flow of fluids into the bowel, so stool firms up and you go less often. Take it right after your first loose bowel movement, then again after each subsequent one, without exceeding the 24-hour maximum listed on the package. It is not safe for children under 2, and you should avoid it entirely if you have a fever, bloody or black stools, or mucus in your stool, as these can signal an infection that your body needs to clear rather than trap.
Bismuth subsalicylate (the active ingredient in Pepto-Bismol) is a milder option that coats the stomach lining and can reduce the frequency of loose stools. It sometimes turns your tongue or stool black, which is harmless. Because it contains a compound related to aspirin, it’s not appropriate for children or teens recovering from a viral illness, or for anyone who takes blood thinners.
What to Eat (and What to Skip)
You may have heard of the BRAT diet: bananas, rice, applesauce, and toast. It was the standard recommendation for decades, but it’s no longer advised as a strict regimen. It lacks calcium, vitamin B12, protein, and fiber, and following it for more than a day or two can actually slow recovery, especially in children. The American Academy of Pediatrics considers it too restrictive for kids.
A better approach is to eat bland, soft foods as tolerated and return to a normal diet as soon as you can. Good early choices include plain rice, boiled potatoes, crackers, chicken breast, and oatmeal. As your appetite returns, reintroducing a variety of foods gives your gut the nutrients it needs to repair itself.
Certain foods and ingredients reliably make diarrhea worse:
- Dairy products. Diarrhea can temporarily reduce your ability to digest lactose, the sugar in milk. Even people who normally tolerate dairy may find it triggers cramps and loose stools during a bout.
- Sugar alcohols. Sorbitol, mannitol, and xylitol, commonly found in sugar-free gum, candies, and some liquid medicines, pull water into the intestine and worsen symptoms.
- Fructose in large amounts. Fruit juices, honey, and soft drinks sweetened with high-fructose corn syrup can overwhelm your gut’s ability to absorb this sugar.
- Caffeine and alcohol. Both speed up intestinal motility and promote fluid loss.
- Greasy or fried foods. High-fat meals are harder to digest and can trigger more cramping.
How Long Diarrhea Typically Lasts
The timeline depends on the cause. Food poisoning from a bacterial toxin often resolves within 12 to 24 hours. Viral diarrhea, the most common type, generally lasts two to three days. Bacterial infections without treatment run three to seven days. Parasitic infections are the outlier: they can persist for weeks or even months without specific treatment.
If you recently traveled internationally and your diarrhea isn’t improving after a week, a parasite is worth considering. Your doctor can confirm this with a stool test.
Probiotics and Zinc
Probiotics, the beneficial bacteria found in fermented foods and supplements, may help shorten a bout of diarrhea by restoring balance to your gut flora. Look for products containing well-studied strains rather than generic blends. Yogurt with live cultures is a simple food-based option, though if dairy is worsening your symptoms, a capsule form avoids the lactose issue.
Zinc supplementation has been shown to reduce both the duration and severity of diarrhea in children, and the World Health Organization recommends 20 mg per day for 10 to 14 days for children with acute diarrhea (10 mg per day for infants under six months). Zinc supports the intestinal lining and helps the body fight infection. For adults, evidence is less definitive, but maintaining adequate zinc intake through foods like meat, shellfish, and pumpkin seeds supports gut health during recovery.
Special Considerations for Children
Children dehydrate faster than adults, and the signs are different. Watch for no wet diapers in three or more hours, sunken eyes or cheeks, unusual sleepiness or irritability, and skin that stays “tented” when you pinch and release it. A fever above 102°F alongside diarrhea also warrants prompt medical attention.
Antidiarrheal medications like loperamide are generally not necessary for children and can be harmful. The priority for kids is oral rehydration. Pedialyte or similar solutions are designed to replace exactly what children lose. Continue breastfeeding or formula feeding if the child is an infant, and offer a normal diet as soon as the child is willing to eat.
Warning Signs That Need Medical Attention
Most diarrhea is a nuisance, not an emergency. But certain symptoms signal something more serious. For adults, see a doctor if diarrhea lasts more than two days without any improvement, if you notice blood or black color in your stool, if you develop a fever above 102°F, or if you have severe abdominal or rectal pain. Signs of dehydration that aren’t responding to oral fluids, like persistent dizziness, extreme weakness, or very dark urine, also need professional evaluation.
Bloody or black stools are particularly important. They can indicate a bacterial infection, inflammatory bowel disease, or other conditions where using antidiarrheal medications could make things worse by preventing your body from clearing the pathogen.