Most cases of acute diarrhea resolve on their own within a few days, but the right combination of fluids, food choices, and over-the-counter options can speed that timeline and keep you comfortable in the meantime. Acute diarrhea is defined as lasting less than two weeks, and the vast majority of episodes wrap up well before that. Here’s what actually works.
Stay Hydrated First
Diarrhea pulls water and electrolytes out of your body fast, so replacing them is the single most important thing you can do. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing. Oral rehydration solutions (sold as Pedialyte, DripDrop, or generic store brands) contain about three times the sodium of a typical sports drink, along with a lower sugar concentration, which makes them better suited for rehydration during illness. Sports drinks aren’t ideal because their higher sugar content can actually draw more water into the gut and worsen loose stools.
A simple way to gauge your hydration: check the color of your urine. It should be light yellow to nearly colorless, and you should be urinating roughly every three to five hours. Dark yellow urine or going many hours without urinating means you need to drink more. Sip small amounts frequently rather than gulping large volumes, especially if nausea is also an issue.
What to Eat (and What to Skip)
You may have heard of the BRAT diet: bananas, rice, applesauce, and toast. While those foods are gentle on the stomach, medical guidelines no longer recommend sticking to them exclusively. The BRAT diet lacks calcium, vitamin B12, protein, and fiber, and in children, following it for more than 24 hours can actually slow recovery. The current advice is simpler: eat as tolerated. Start with bland, soft foods if that’s all you can manage, but return to a normal, balanced diet as soon as you feel up to it. Your gut needs nutrients to heal.
Certain foods and drinks, however, will make things worse while your gut is irritated:
- Caffeine speeds up your digestive system, pushing contents through before enough water is reabsorbed.
- Dairy products contain lactose, a sugar that many people have difficulty digesting even under normal conditions. During a bout of diarrhea, your ability to break down lactose drops further.
- Sugar-free gum and candy contain sorbitol, mannitol, or xylitol. These sugar alcohols stimulate the gut to release water and electrolytes, loosening stools.
- Greasy or fried foods are harder to digest and can trigger cramping.
- Alcohol is dehydrating and irritates the gut lining.
Once your stools firm up, you can reintroduce these gradually.
Over-the-Counter Medications
Loperamide (sold as Imodium) is the most widely used anti-diarrheal. It works by slowing the movement of your intestines, giving your gut more time to absorb water. It also tightens the anal sphincter, which helps with urgency and the feeling that you can’t make it to the bathroom in time. The standard adult dose is two caplets (4 mg) to start, then one caplet (2 mg) after each loose stool, up to a maximum of eight caplets (16 mg) in a day. Most people see improvement within 48 hours.
Bismuth subsalicylate (Pepto-Bismol) is another option. It coats the lining of the stomach and intestines and has mild anti-inflammatory and antibacterial properties. It’s generally better suited for milder symptoms or traveler’s diarrhea. Keep in mind that it will turn your tongue and stools black temporarily, which is harmless.
One important caveat: if your diarrhea comes with a high fever or bloody stools, skip the loperamide. In those cases, your body may be trying to flush out a bacterial infection, and slowing that process down can do more harm than good.
Probiotics Can Shorten Recovery
Certain probiotic strains help restore the balance of bacteria in your gut, and the evidence for one strain in particular is solid. In a study of children with acute diarrhea, those given Saccharomyces boulardii (a beneficial yeast sold as Florastor) had a median diarrhea duration of 3 days, compared to 4 days in the group that didn’t receive it. That’s roughly a 25% reduction in how long symptoms last. Lactobacillus rhamnosus GG is another well-studied strain that has been shown to significantly reduce diarrhea incidence.
Probiotics work best when started early in the illness. You can find them in capsule form at most pharmacies. Look for products that list a specific strain name rather than just “probiotic blend,” and check that they contain at least 1 billion colony-forming units (CFUs) per dose.
Rest Your Gut, but Don’t Starve It
There’s a persistent idea that you should stop eating entirely until diarrhea passes. This backfires. Fasting deprives your intestinal lining of the fuel it needs to repair itself and can worsen weakness and fatigue. If you have no appetite, even small portions of simple foods like scrambled eggs, chicken broth, boiled potatoes, or oatmeal give your body something to work with. As your appetite returns, increase portions and variety. Most people can eat normally within two to three days of symptom onset.
Signs That Diarrhea Needs Medical Attention
Most diarrhea is caused by a virus and clears up without any medical intervention. But certain red flags signal something more serious:
- Duration beyond two weeks. Diarrhea lasting 2 to 4 weeks is classified as persistent, and anything beyond 4 weeks is chronic. Both warrant evaluation.
- Blood or pus in the stool. This can indicate a bacterial infection or inflammatory condition.
- Fever above 102°F (39°C).
- Signs of dehydration you can’t correct by drinking. These include very dark urine, dizziness when standing, rapid heartbeat, or going many hours without urinating.
- Severe abdominal pain that goes beyond typical cramping.
In cases of dehydration that can’t be managed at home, fluids can be given intravenously in an urgent care or emergency setting. For most adults, though, consistent oral rehydration keeps things from reaching that point.