The fastest way to stop diarrhea is with loperamide (sold as Imodium), which can slow gut contractions within an hour of the first dose. But medication is only one piece. Replacing lost fluids, eating the right foods, and knowing when not to use anti-diarrheal drugs all matter for a safe, quick recovery.
Loperamide: The Fastest Over-the-Counter Option
Loperamide works by slowing the muscle contractions in your intestines, giving your body more time to absorb water from food. For acute diarrhea, the standard approach is to take two tablets (4 mg total) after your first loose stool, then one tablet (2 mg) after each additional loose stool. The over-the-counter maximum is four tablets (8 mg) in 24 hours.
There are situations where you should skip loperamide entirely. If you have bloody stool with a fever, those can be signs of a bacterial infection like dysentery, and slowing your gut down can trap the bacteria inside and make things worse. The same applies to severe diarrhea that started after taking antibiotics, which could signal a serious infection that needs medical treatment, not symptom suppression. If you’ve recently traveled internationally and picked up a stomach bug, talk to a doctor before reaching for loperamide.
Bismuth Subsalicylate for Milder Cases
Pepto-Bismol (bismuth subsalicylate) is a gentler option that works differently. Rather than slowing gut motility, it reduces inflammation in the intestinal lining and has mild antimicrobial effects. The dosing schedule is more frequent: 30 mL every half hour or 60 mL every hour, up to eight doses (240 mL) in 24 hours. Don’t use it for more than two days.
Bismuth subsalicylate is a reasonable first choice for traveler’s diarrhea or mild cases where you’re unsure of the cause. It’s less aggressive than loperamide and carries fewer risks if a bacterial infection turns out to be involved. One cosmetic side effect: it can temporarily turn your tongue and stool black, which is harmless.
Replace Fluids Before Anything Else
Diarrhea pulls water and electrolytes out of your body fast. Dehydration is the main danger, especially in the first 24 hours. Signs you’re already dehydrated include extreme thirst, dark urine, dizziness, and skin that stays “tented” when you pinch and release it instead of flattening back immediately.
Oral rehydration solutions (like Pedialyte or pharmacy-brand ORS packets) are the gold standard. They contain about three times as much sodium as a typical sports drink (roughly 60 mM versus 18 mM) along with a lower sugar concentration, which is the ratio your intestines need to absorb water most efficiently. Sports drinks will work in a pinch, but they’re designed for sweat loss, not diarrhea. They have more sugar and less sodium than what your gut actually needs right now.
If you don’t have access to either, you can make a basic rehydration drink at home: mix six teaspoons of sugar and half a teaspoon of salt into a liter of clean water. Sip steadily rather than gulping large amounts, which can trigger more cramping.
What to Eat (and What to Skip)
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, toast. It’s been recommended for decades, but no clinical trials have ever actually tested whether it works. What the research does show is that the old idea of “resting” your gut by eating almost nothing is counterproductive. Randomized trials have found that eating soon after rehydration leads to lower stool output, shorter illness duration, and better nutritional recovery compared to gradually reintroducing food.
The practical takeaway: eat when you can tolerate it, and don’t limit yourself to four bland foods. Focus on simple, low-fat meals. Plain rice, potatoes, cooked carrots, lean chicken, and crackers are all good options. Avoid dairy (temporarily, since diarrhea can cause short-term lactose intolerance), greasy or fried foods, caffeine, alcohol, and anything with sugar alcohols like sorbitol, which are common in sugar-free gum and candy and can worsen loose stools on their own.
Chamomile and Ginger Tea
Chamomile has some clinical backing as a gut relaxant. In a small trial of patients with diarrhea-dominant irritable bowel syndrome, chamomile drops taken twice daily reduced the frequency of bowel movements from an average of 3.4 per day to 1.3 after four weeks. By the end of the study, 95% of participants who started with watery diarrhea had normal stool consistency. Chamomile appears to work by easing spasms in the intestinal muscles.
That said, four weeks is not “quickly.” Chamomile tea is a reasonable complement to other treatments, especially if cramping is a major symptom, but it won’t replace loperamide for speed. Ginger tea can help with the nausea that often accompanies diarrhea, though its direct effect on stool frequency is less well studied. Both are safe for most people and at minimum keep fluid intake up.
A Quick Timeline: What to Expect
Most cases of acute diarrhea from a viral stomach bug resolve within one to three days on their own. Loperamide can reduce the number of loose stools within a few hours. Bismuth subsalicylate tends to work more gradually over the first day. Staying hydrated and eating early will shorten your overall recovery time compared to fasting or restricting food.
If diarrhea persists beyond two days in an adult, or is accompanied by a high fever, bloody stool, signs of dehydration that aren’t improving with fluids, or severe abdominal pain, those are signals that something beyond a routine stomach bug may be going on and warrants medical evaluation.