For most cases of diarrhea with stomach pain, an over-the-counter anti-diarrheal like loperamide (Imodium) combined with a stomach-soothing option like bismuth subsalicylate (Pepto-Bismol) will provide the fastest relief. Which one you reach for first depends on whether your main problem is frequent loose stools, cramping, or both.
Best OTC Options for Diarrhea
Loperamide is the most effective nonprescription option for stopping diarrhea quickly. It works by slowing down the muscle contractions in your intestines, giving your body more time to absorb water from stool. You can expect it to start working within about an hour, though the full effect can take 16 to 24 hours to kick in. In a head-to-head comparison with bismuth subsalicylate, loperamide reduced the number of unformed bowel movements significantly faster, controlled diarrhea for longer after the first dose, and received higher satisfaction ratings from the people taking it.
Bismuth subsalicylate is a better fit if your diarrhea comes with nausea, heartburn, or an upset stomach alongside loose stools. It coats the lining of your stomach and intestines, reduces inflammation, and has mild antibacterial properties. It works more slowly than loperamide for diarrhea alone, but it covers a wider range of stomach symptoms. One important safety note: bismuth subsalicylate is related to aspirin and should not be given to children or teenagers due to the risk of Reye syndrome, a rare but serious condition linked to salicylates.
If both diarrhea and cramping are hitting you hard, you can use loperamide to slow things down and bismuth subsalicylate for the pain and nausea, since they work through different mechanisms. Follow the dosing on each package and don’t exceed the daily limits.
What Helps With the Stomach Pain
Stomach pain during a bout of diarrhea usually comes from intestinal spasms, the muscles in your gut contracting too hard or too frequently. Bismuth subsalicylate helps with mild cramping. For sharper pain, simethicone (Gas-X) can relieve pressure from trapped gas, which often accompanies diarrhea and makes the pain feel worse than the diarrhea itself warrants.
Peppermint oil capsules are worth considering if your pain feels like cramping or spasms. Clinical trials in people with irritable bowel syndrome found that peppermint oil significantly reduced abdominal pain compared to placebo. In one trial, 79% of people taking peppermint oil reported moderate to marked pain improvement, versus 43% on placebo. It works by relaxing the smooth muscle in your intestinal wall and slowing gut contractions. Enteric-coated capsules are the form to look for, since they dissolve in the intestines rather than the stomach.
Ginger, taken as tea or chewable tablets, can help settle nausea and mild stomach discomfort. It won’t stop diarrhea, but if your pain comes with queasiness, it’s a simple addition.
Probiotics That Shorten Recovery
Certain probiotic strains can reduce how long a bout of diarrhea lasts, particularly when it’s caused by a viral infection. The two with the strongest clinical backing are Saccharomyces boulardii (a yeast-based probiotic) and Lactobacillus rhamnosus GG. In studies, S. boulardii taken twice daily for five days significantly shortened the duration of diarrhea, while L. rhamnosus GG reduced both the number of watery stools and recovery time.
Probiotics won’t give you immediate relief the way loperamide does, but they support your gut in recovering faster. Look for products that list specific strain names on the label, not just a genus like “Lactobacillus.” You can take them alongside OTC medications.
What to Eat and Drink
Staying hydrated matters more than any medication when you have diarrhea. Loose stools pull water and electrolytes out of your body quickly. Sip water, broth, or an oral rehydration solution throughout the day. Sports drinks work in a pinch but contain more sugar than ideal.
You may have heard of the BRAT diet (bananas, rice, applesauce, toast) as the go-to during stomach illness. Current medical guidance no longer recommends it as a protocol. It’s too nutritionally limited to support recovery if followed for more than a day or two. Instead, eat what you can tolerate. Bland, low-fiber foods like plain rice, crackers, boiled potatoes, and lean chicken are gentle on your stomach. Avoid dairy, fried foods, caffeine, and alcohol until things settle down, since all of these can worsen diarrhea or cramping.
When Antibiotics Are Needed
Most diarrhea is caused by viruses and clears up on its own. Antibiotics only help when the cause is bacterial, and even then, they’re reserved for moderate to severe cases. The CDC considers antibiotic treatment advisable when diarrhea is severe enough to be incapacitating, involves fever, or includes blood or mucus in the stool (dysentery). For traveler’s diarrhea that’s disruptive but not severe, antibiotics are an option but not always necessary.
These are prescription medications, not something you pick up at the pharmacy. If your symptoms suggest a bacterial infection (high fever, bloody stool, severe cramping that doesn’t respond to OTC treatment), a doctor can determine whether antibiotics are appropriate and which type to prescribe based on your travel history and symptoms.
Signs You Need Medical Attention
Most diarrhea with stomach pain resolves within a day or two. But certain symptoms signal something more serious:
- Diarrhea lasting more than two days without improvement
- Fever above 101°F (38.3°C)
- Bloody or black stools
- Severe abdominal or rectal pain that OTC medications don’t touch
- Signs of dehydration: dark urine, dizziness, dry mouth, or no tears when crying (in children)
Children dehydrate much faster than adults. If a child’s diarrhea doesn’t improve within 24 hours, or if they develop a fever above 101°F or show signs of dehydration, that warrants a call to the pediatrician rather than waiting it out.