Most diarrhea resolves on its own within one to two days without any treatment. Your main job during that window is to replace lost fluids, eat sensibly, and avoid making things worse. If symptoms stretch beyond two days, involve blood or high fever, or leave you unable to keep fluids down, that’s a different situation requiring medical attention. Here’s what actually works to speed recovery and stay safe in the meantime.
Replace Fluids Before Anything Else
Dehydration is the real danger with diarrhea, not the diarrhea itself. Every loose stool pulls water and essential salts out of your body, and replacing them is the single most important thing you can do. Plain water helps, but it doesn’t contain the sodium and glucose your intestines need to absorb fluid efficiently. The ideal ratio is roughly equal parts sodium and glucose, which is why oral rehydration solutions work better than water alone.
You can buy premade oral rehydration packets at most pharmacies. If you don’t have access to one, you can make a simple version at home: mix 4 cups of water with half a teaspoon of table salt and 2 tablespoons of sugar. Sip it steadily rather than gulping large amounts at once. Sports drinks are a distant second choice since they contain too much sugar and not enough sodium, but they’re better than nothing if it’s all you have.
For children, the stakes are higher. Kids dehydrate faster, and infants under 12 months with diarrhea need medical attention promptly. The World Health Organization recommends zinc supplements for children with diarrhea: 20 mg per day for 10 to 14 days (10 mg per day for infants under six months), which shortens the episode and reduces severity.
Eat Normally, Not Restrictively
You may have heard of the BRAT diet (bananas, rice, applesauce, toast) as a go-to for diarrhea. It’s outdated. Multiple clinical trials have shown that resuming a normal, balanced diet as soon as you can tolerate food leads to shorter illness, less stool output, and better nutritional recovery compared to restrictive eating. The American Academy of Pediatrics, the CDC, and the WHO all recommend eating age-appropriate food as soon as rehydration is underway.
Sticking to bland, low-nutrient foods like plain toast for days can actually slow recovery and, in children especially, lead to nutritional deficits. Instead, aim for balanced meals with carbohydrates, protein, and some fat. Lean meats, cooked vegetables, rice, potatoes, yogurt, and soups are all reasonable choices. The one thing worth avoiding: greasy, heavily spiced, or very high-fiber foods that can aggravate an already irritated gut. Dairy is fine for most people unless you notice it makes things worse, which can happen temporarily because diarrhea sometimes reduces your ability to digest lactose for a few days.
Over-the-Counter Options
Two common pharmacy options can help manage symptoms while your body fights off the cause.
Loperamide (sold as Imodium) slows the movement of your intestines, giving them more time to absorb water. It also tightens the anal sphincter, which helps with urgency and incontinence. The maximum dose for adults is 16 mg in 24 hours (eight capsules of the standard 2 mg dose), but most people need far less. Start with the dose on the package and adjust down. One important caveat: do not take loperamide if you have bloody diarrhea or a fever. Slowing your gut when a bacterial infection is trying to flush itself out can make things worse.
Bismuth subsalicylate (Pepto-Bismol) can reduce the number of loose stools and ease cramping. It contains a compound related to aspirin, so avoid it if you’re already taking aspirin or other salicylate-containing medications. It should not be given to children under 12, and never to children or teenagers recovering from the flu or chickenpox due to the risk of Reye’s syndrome, a rare but serious condition. Expect it to turn your tongue and stool black temporarily, which is harmless.
Probiotics Can Help, Especially for Certain Types
Probiotics are live bacteria that support your gut’s natural balance, and the evidence for them during diarrhea is genuinely solid. A large meta-analysis published in The Lancet found that probiotics reduced antibiotic-associated diarrhea by 52% and acute diarrhea from various causes by 34%. The effect was strongest in children, where probiotics cut the risk by 57%, compared to 26% in adults.
The good news is that you don’t need a specific strain. Saccharomyces boulardii, Lactobacillus rhamnosus GG, and Lactobacillus acidophilus all showed similar protective effects, whether used alone or in combination. Look for any reputable probiotic supplement at the pharmacy, or eat probiotic-rich foods like yogurt with live cultures. They work best when started early in the illness.
When Diarrhea Needs Medical Attention
Most episodes are viral and self-limiting. But certain signs mean you should contact a doctor promptly:
- Duration: diarrhea lasting more than two days in adults, or more than one day in children
- Stool appearance: black, tarry stools or stools containing red blood or pus
- High fever
- Severe abdominal or rectal pain
- Six or more loose stools per day
- Signs of dehydration: dark urine, dizziness, dry mouth, or in children, irritability and lack of energy
- Inability to keep fluids down due to frequent vomiting
Bloody diarrhea or diarrhea with fever may indicate a bacterial infection that needs antibiotics rather than just supportive care. The CDC classifies diarrhea that is incapacitating or completely prevents normal activities as severe, and at that point antibiotic treatment is advised. This is especially relevant for travelers, since bacterial causes are more common abroad.
Traveler’s Diarrhea Is a Special Case
If your diarrhea started during or shortly after international travel, the approach shifts slightly. Mild traveler’s diarrhea, the kind that’s annoying but doesn’t stop you from doing what you planned, generally doesn’t need antibiotics. Moderate cases that interfere with your activities can be treated with antibiotics, and severe cases that leave you unable to function warrant them. Loperamide can be paired with antibiotics for faster relief in moderate cases, but should not be used alone if you have a fever or bloody stools.
If you travel frequently to areas where traveler’s diarrhea is common, ask your doctor before departure about carrying a short course of antibiotics for self-treatment. This is a standard recommendation from the CDC for high-risk destinations.
What to Expect During Recovery
Acute diarrhea, the most common type, typically wraps up in one to two days. If symptoms linger for two to four weeks, it’s classified as persistent diarrhea and may need investigation. Anything beyond four weeks, or episodes that keep coming back, is considered chronic and could signal conditions like irritable bowel syndrome, food intolerances, or inflammatory bowel disease.
Even after the diarrhea stops, your gut may feel off for a few days. Mild bloating, occasional loose stools, and temporary sensitivity to certain foods are normal during recovery. Continue eating balanced meals, stay well hydrated, and give your digestive system a few days to fully reset. If you took antibiotics recently and then developed diarrhea, mention that to your doctor, since antibiotic-associated diarrhea sometimes requires specific treatment.