Most cases of diarrhea clear up on their own within one to three days. The most important thing you can do is replace lost fluids, eat carefully, and let your gut recover. If symptoms are mild, you can manage nearly everything at home with a few straightforward steps.
Replace Fluids Before Anything Else
Diarrhea pulls water and electrolytes out of your body fast. Dehydration is the real danger, not the diarrhea itself. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing with every trip to the bathroom. Sports drinks work in a pinch, though many contain more sugar than is ideal.
The most effective option is an oral rehydration solution. You can buy premade packets at any pharmacy, or make your own using the World Health Organization’s recipe: dissolve half a teaspoon (3 grams) of salt and 2 tablespoons (30 grams) of sugar into about 1 liter of clean water. The sugar isn’t just for taste. It helps your intestines absorb the sodium and water more efficiently. Sip steadily throughout the day rather than gulping large amounts at once.
Watch for signs that dehydration is getting ahead of you. A dry mouth is the earliest signal. If your skin feels cool or clammy, your urine output drops noticeably, or you feel lightheaded when standing, you’ve moved past mild dehydration and need to be more aggressive about fluids, or seek help.
What to Eat (and What to Skip)
You don’t need to stop eating entirely. In fact, eating small amounts of bland food helps your intestinal lining recover. Focus on simple, low-fiber, low-fat options: plain white rice, boiled potatoes, plain crackers, bananas, and chicken broth are all gentle choices. You may have heard of the BRAT diet (bananas, rice, applesauce, toast). It’s been a go-to recommendation for decades, but current evidence doesn’t support it as especially effective, and sticking to only those four foods for more than a day or two can leave you short on protein and other nutrients. Think of it as a starting point, not a complete plan.
What you avoid matters just as much as what you eat. Several common foods and drinks actively make diarrhea worse:
- Dairy products. Your gut’s ability to digest lactose often drops temporarily during and after a bout of diarrhea, sometimes for a month or more.
- Caffeine. Coffee, tea, and caffeinated soft drinks stimulate your intestines and speed up transit time.
- Alcohol. It irritates the gut lining and pulls more water into the intestines.
- High-fat foods. Fried foods, pizza, and fast food are harder to digest and can trigger cramping.
- High-sugar foods and drinks. Fruit juices, candy, and sweetened beverages contain fructose that can draw water into the bowel. Sugar-free gum and candies are even worse because they contain sugar alcohols (like sorbitol and xylitol), which are notorious for causing loose stools even in healthy people.
Reintroduce your normal diet gradually as stools firm up. Most people can return to regular eating within a few days.
Over-the-Counter Medications
Two types of OTC medication can help slow things down. Loperamide (sold as Imodium) works by reducing the speed of muscle contractions in your intestines, giving your body more time to absorb water. The standard approach for adults is 4 mg at the first loose stool, then 2 mg after each additional unformed stool, up to a maximum of 8 mg in 24 hours for OTC use. Children under 12 should not take it without a pediatrician’s guidance, and it’s not safe for children under 2 at all.
Bismuth subsalicylate (Pepto-Bismol) takes a different approach. It coats the intestinal lining and has mild antibacterial properties. It can help with cramping and the urgency that comes with diarrhea. Don’t be alarmed if it turns your tongue or stool black; that’s a harmless side effect of the bismuth.
One important caveat: if your diarrhea is bloody or accompanied by a high fever, skip the loperamide. In cases of certain bacterial infections, slowing your gut down can actually trap the bacteria inside longer and make things worse.
How Long Diarrhea Typically Lasts
Viral gastroenteritis, the most common cause, usually resolves within 72 hours. Norovirus tends to hit hard and fast with abdominal cramps, nausea, vomiting, and watery (not bloody) diarrhea, but most people feel significantly better within one to three days. Food poisoning from bacterial toxins follows a similar timeline and is treated the same way: fluids, rest, and gentle eating.
If your diarrhea stretches past two days without any improvement, that’s a signal to get it checked out. Bacterial infections sometimes need antibiotics, and persistent diarrhea can point to other causes like a parasite, medication side effect, or a flare of an underlying condition like irritable bowel syndrome.
Signs That Need Medical Attention
Most adults can ride out a bout of diarrhea at home. But certain symptoms change the equation. For adults, the red flags are: diarrhea lasting more than two days with no improvement, blood or black color in the stool, a fever above 102°F (39°C), or severe abdominal or rectal pain.
Children dehydrate faster than adults, so the threshold is lower. A child whose diarrhea hasn’t improved within 24 hours, who has a fever above 102°F, or who has bloody or black stools needs medical evaluation. In young children especially, watch for fewer wet diapers, crying without tears, and unusual drowsiness. These are signs that fluid loss is outpacing what you can replace at home.