Most cases of diarrhea clear up on their own within a few days, but you can speed recovery and feel better faster with the right combination of fluids, food choices, and over-the-counter options. Acute diarrhea, the most common type, lasts less than two weeks. If yours stretches past two weeks, it’s considered persistent, and anything beyond four weeks is classified as chronic, which points to a different underlying cause that needs evaluation.
Fluids First: Preventing Dehydration
Diarrhea pulls water and electrolytes out of your body fast. Replacing them is the single most important thing you can do. Water alone isn’t ideal because it lacks the sodium and potassium your intestines need to absorb fluid efficiently. Oral rehydration solutions (sold as Pedialyte or store-brand equivalents) work best. Broth, diluted juice, and coconut water are reasonable alternatives for adults with mild symptoms.
Signs you’re getting dehydrated include dry mouth, darker urine, reduced urine output, and feeling lightheaded. In children, watch for fewer wet diapers, no tears when crying, and unusual irritability. Severe dehydration causes rapid heart rate, skin that stays “tented” when pinched, and in the worst cases, lethargy or confusion. Young children can deteriorate quickly, so take even moderate signs seriously in kids under five.
What to Eat (and What to Skip)
The old advice to stick to the BRAT diet (bananas, rice, applesauce, toast) is outdated. Randomized trials have shown that resuming a normal, balanced diet as soon as you can tolerate it actually leads to shorter illness, lower stool output, and better nutritional recovery compared to restricting yourself to bland carbohydrates. The American Academy of Pediatrics, the CDC, and the World Health Organization all recommend eating age-appropriate foods as soon as rehydration is underway. A restrictive diet during illness can delay recovery and, in children especially, contribute to nutritional deficits.
That said, certain foods and drinks genuinely make diarrhea worse and are worth avoiding until you’re feeling better:
- Dairy products: If you’re even mildly lactose intolerant, undigested lactose ferments in the colon and produces gas and loose stools. Temporary lactose intolerance is common after a gut infection, even if dairy doesn’t normally bother you.
- Fructose-heavy fruits: Apples, pears, and dried fruits contain high levels of fructose that can trigger the same fermentation effect as lactose when your gut is inflamed.
- Sugar-free gum and candy: Sorbitol and xylitol, the artificial sweeteners in most sugar-free products, are well-documented causes of diarrhea.
- Caffeine: Coffee, tea, cola, and chocolate stimulate the gut and can increase stool frequency. This includes caffeinated pain relievers.
- Greasy or fried foods: High-fat meals are harder to digest when your intestinal lining is irritated.
- Alcohol: It irritates the gut lining and worsens dehydration.
Focus on foods you tolerate well. Lean proteins, cooked vegetables, rice, potatoes, eggs, and soups are all fine. The goal is calories and nutrients, not restriction.
Over-the-Counter Medications
Loperamide (sold as Imodium) is the most effective nonprescription option for slowing diarrhea. It works by acting on receptors in the intestinal wall to slow the movement of food through your gut, giving your intestines more time to absorb water. The standard adult dose is 4 mg to start, then 2 mg after each loose stool, up to a maximum of 8 mg per day when using it without a prescription. Don’t exceed 16 mg per day even with a doctor’s guidance.
Loperamide should not be given to children under two. For older children, dosing depends on weight, and it’s best used only on a pediatrician’s recommendation. The Infectious Disease Society of America specifically advises against using it for infectious diarrhea in children.
Bismuth subsalicylate (Pepto-Bismol) is another option that can reduce stool frequency and ease nausea. It coats the stomach lining and has mild antimicrobial properties. Avoid it if you’re allergic to aspirin, since it contains a related compound.
One important caution: if your diarrhea includes blood, high fever, or severe abdominal pain, skip the loperamide. In cases caused by certain bacterial infections, slowing gut motility can trap the pathogen inside and make things worse.
Probiotics: What the Evidence Shows
Certain probiotic strains can shorten a bout of diarrhea, but the benefit depends heavily on the dose and timing. A meta-analysis of 19 randomized controlled trials found that one well-studied strain (Lactobacillus rhamnosus GG, commonly labeled LGG) reduced diarrhea duration by about 24 hours on average compared to placebo. The catch: this benefit only appeared at high doses of at least 10 billion colony-forming units per day. Lower doses showed no significant reduction in stool frequency.
Timing matters too. Starting probiotics within the first two to three days of symptoms produced the clearest benefit. The strongest results were seen in rotavirus-related diarrhea, where high-dose LGG cut illness duration by about 31 hours. Saccharomyces boulardii, a yeast-based probiotic, has shown similar results in other trials and is widely recommended for antibiotic-associated diarrhea specifically.
If you want to try probiotics, check the label for specific strain names and CFU counts. A generic “probiotic blend” with unspecified strains and low potency is unlikely to help.
Traveler’s Diarrhea
If diarrhea hits while you’re traveling internationally, the approach depends on severity. CDC guidelines break it into three tiers. Mild diarrhea that doesn’t disrupt your plans doesn’t need antibiotics. Just stay hydrated and consider loperamide. Moderate diarrhea that interferes with your activities can be treated with a short course of antibiotics. Severe diarrhea, meaning you’re incapacitated or there’s blood in your stool, calls for antibiotic treatment right away.
Loperamide can be combined with antibiotics for faster relief. Many travelers carry a prescription antibiotic as a standby for self-treatment. The specific antibiotic depends on your destination, since resistance patterns vary by region. If you’re traveling to Southeast Asia, for example, fluoroquinolone-resistant bacteria are common, so a different class of antibiotic is preferred. Your doctor can prescribe an appropriate option before your trip.
Warning Signs That Need Medical Attention
Most diarrhea resolves without medical care, but certain symptoms signal something more serious. Seek evaluation if you notice blood or pus in your stool, a fever above 102°F (39°C), signs of significant dehydration despite drinking fluids, severe or worsening abdominal pain, or diarrhea lasting more than two days in a young child or more than a few days in an adult with no improvement.
In infants and young children, dehydration progresses faster than in adults. A child who is unusually sleepy, has sunken eyes, or refuses to drink needs prompt medical care. In adults, persistent diarrhea beyond four weeks warrants investigation for conditions like celiac disease, inflammatory bowel disease, or chronic infections, none of which will respond to the home measures described above.