Most cases of diarrhea resolve on their own within one to three days. Your main job during that time is to replace lost fluids, eat the right foods, and avoid anything that makes it worse. What you do in the first few hours matters more than most people realize, because dehydration is the real danger, not the diarrhea itself.
Start Replacing Fluids Immediately
Every loose stool pulls water and electrolytes out of your body. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing. The most effective approach is an oral rehydration solution, which you can buy at any pharmacy or make at home. The World Health Organization recipe calls for half a teaspoon of salt, a quarter teaspoon of salt substitute (like No Salt, which provides potassium), half a teaspoon of baking soda, and two tablespoons of sugar, all mixed into four cups (one liter) of water. The sugar isn’t just for taste. It activates a transport system in your gut that pulls sodium and water back into your body.
If mixing your own solution sounds like too much, store-bought options like Pedialyte or Drip Drop work well. Broth-based soups are another solid choice because they naturally contain sodium. Sports drinks are acceptable in a pinch but contain more sugar than ideal. Avoid fruit juices, sodas, and energy drinks, all of which can pull more water into the intestines and make diarrhea worse.
Sip frequently rather than gulping large amounts at once. If you’re vomiting alongside the diarrhea, take small sips every few minutes rather than full glasses. Watch for signs of dehydration: dark urine, urinating much less than usual, dry mouth and throat, or dizziness when you stand up. Mild dehydration starts at around 5% of body weight in fluid loss, which for a 150-pound person is less than a gallon of fluid.
What to Eat (and What to Skip)
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s fine for the first day or two, but Harvard Health notes there’s no reason to restrict yourself to just those four foods. A broader range of bland, easy-to-digest options will give you more nutrients to support recovery. Good choices include brothy soups, oatmeal, boiled potatoes, crackers, unsweetened dry cereal, and cooked carrots or squash.
Once your stomach settles, start adding protein. Skinless chicken or turkey, fish, eggs, and avocado are all gentle on the gut while providing what your body needs to heal. The goal is to move back toward a normal diet as quickly as your system tolerates it, because staying on a highly restricted diet for more than a couple of days can leave you short on calories and nutrients right when your body needs them.
Certain foods and ingredients actively make diarrhea worse. Caffeine stimulates the gut and speeds up transit time. Dairy can be difficult to digest because diarrhea temporarily reduces the enzyme that breaks down lactose. Fatty, greasy, or heavily spiced foods are harder to process and can trigger more cramping. Sugar-free candies, gums, and diet products deserve special attention. Many contain sorbitol, a sugar alcohol that acts as an osmotic laxative. As little as 10 grams of sorbitol (a handful of sugar-free candies) causes bloating in most people, and 20 grams reliably triggers cramping and diarrhea. The CDC has linked outbreaks of unexplained diarrhea to dietetic candy consumption. Check labels if you regularly use sugar-free products. Alcohol is also worth avoiding, as it irritates the gut lining and acts as a diuretic, worsening dehydration.
Over-the-Counter Medications
Two types of medication are widely available for diarrhea relief. The first, loperamide (sold as Imodium), slows down gut movement so your intestines have more time to absorb water. It’s effective for garden-variety diarrhea and is especially useful when you need symptom control for travel or work. Adults should not exceed four tablets (8 mg) in 24 hours for the tablet form. If your diarrhea hasn’t improved within two days of using it, stop taking it.
The second option, bismuth subsalicylate (Pepto-Bismol), works differently. It reduces inflammation in the gut lining, binds some bacterial toxins, and has mild antimicrobial effects. It’s generally gentler and a reasonable first choice for mild cases.
There’s an important caveat with both medications, particularly loperamide. If your diarrhea involves a fever, blood or pus in your stool, or severe abdominal pain, do not take anti-diarrheal medication before seeing a doctor. These are signs of a possible bacterial infection from organisms like Salmonella, Shigella, or toxin-producing E. coli. Slowing your gut in that situation traps the bacteria and their toxins inside you longer, which can prolong fever, worsen the infection, and increase the risk of complications. Your body is using diarrhea to flush the pathogen out, and you don’t want to interfere with that process.
Probiotics Can Shorten Recovery
Certain probiotic strains help restore the balance of gut bacteria disrupted during a bout of diarrhea. The best-studied strain for this purpose is Saccharomyces boulardii, a beneficial yeast that’s particularly effective for antibiotic-associated diarrhea and traveler’s diarrhea. The typical adult dose is 500 mg once daily for prevention or twice daily for active treatment, continued for one to four weeks depending on severity. You can find it in most pharmacies under brand names like Florastor.
Other well-studied strains include Lactobacillus rhamnosus GG, commonly found in yogurt-based supplements. Probiotics won’t stop diarrhea overnight, but they can shorten the duration by roughly a day and reduce the severity of symptoms. They’re safe for most adults and worth adding alongside rehydration.
Red Flags That Need Medical Attention
Most diarrhea is self-limiting, but certain symptoms signal something more serious. The CDC recommends seeking medical care if you experience any of the following:
- Bloody stool, which can indicate a bacterial infection or inflammatory process
- Diarrhea lasting more than three days without improvement
- Fever above 102°F (38.9°C)
- Inability to keep liquids down due to frequent vomiting
- Signs of significant dehydration, including minimal urination, dry mouth and throat, or dizziness when standing
For older adults and people with weakened immune systems, the threshold for seeking care should be lower. Dehydration develops faster and becomes dangerous more quickly in these groups. If you’re unsure whether your symptoms are concerning, the combination of fever plus bloody or mucus-heavy stool is the clearest signal that your body is fighting an infection that may need targeted treatment rather than just supportive care at home.