Diotame is an over-the-counter antidiarrheal and stomach relief medication. Its active ingredient is bismuth subsalicylate, the same compound found in Pepto-Bismol. Diotame is typically sold as chewable tablets and is commonly stocked in workplace first aid kits and institutional settings through medical supply distributors like Medique.
What Diotame Treats
Diotame is used for diarrhea, upset stomach, nausea, and indigestion. It works through several mechanisms at once: it slows the flow of fluids into the bowel, reduces inflammation in the intestinal lining, and can kill some of the bacteria responsible for causing diarrhea in the first place.
Because it contains bismuth subsalicylate, Diotame is functionally identical to brand-name products like Pepto-Bismol and Kaopectate. The difference is branding and distribution. If you’ve seen pink Diotame packets or blister packs in a break room or industrial first aid cabinet, that’s why: it’s marketed for workplace and institutional use rather than pharmacy shelves.
How to Take It
For adults and children 12 and older, the standard dose is 2 chewable tablets every 30 minutes to 1 hour as needed. You should not exceed 16 tablets in a 24-hour period, and you shouldn’t use it for more than 2 days. If diarrhea hasn’t resolved after 2 days, it’s time to seek medical advice rather than continuing to self-treat.
Children under 12 should not take Diotame without a doctor’s guidance.
Black Tongue and Dark Stool
One side effect catches people off guard: your tongue or stool may turn black while taking Diotame. This is harmless. It happens when bismuth reacts with trace amounts of sulfur naturally present in your saliva and digestive tract, forming a dark-colored compound called bismuth sulfide. The discoloration goes away on its own once you stop taking the medication.
Who Should Avoid Diotame
Because bismuth subsalicylate is chemically related to aspirin, Diotame carries the same precautions as aspirin-containing products. You should not take it if you have an aspirin allergy, gout, or kidney problems.
The salicylate connection also makes Diotame risky for children and teenagers recovering from viral infections like the flu or chickenpox. Salicylates in this age group are linked to Reye’s syndrome, a rare but serious condition that causes swelling in the liver and brain. This is the same reason children aren’t given aspirin, and it applies equally to Diotame even though it’s not sold as a pain reliever. Many people don’t realize over-the-counter stomach medications can contain salicylates, so reading labels carefully matters.
Pregnant women should also avoid bismuth subsalicylate products.
Drug Interactions
Diotame can interact with several types of medication. The most important interactions involve blood thinners like warfarin, enoxaparin, and dabigatran, since bismuth subsalicylate increases bleeding risk. It also interacts with methotrexate, certain seizure medications like valproic acid, and corticosteroids like prednisone.
If you already take aspirin, ibuprofen, naproxen, or any other anti-inflammatory pain reliever, adding Diotame on top stacks your salicylate exposure and raises the risk of side effects. One exception: if your doctor has prescribed low-dose aspirin (typically 81 mg daily) for heart attack or stroke prevention, you can generally continue that while using Diotame short-term, but check with your pharmacist if you’re unsure.
Traveler’s Diarrhea Prevention
Bismuth subsalicylate has been studied as a preventive measure for traveler’s diarrhea. Research conducted in Mexico found it reduced the incidence of traveler’s diarrhea by roughly 50%. However, the CDC notes that the number of tablets required and the inconvenient dosing schedule make it impractical for most travelers. Safety beyond 3 weeks of continuous use hasn’t been established, which further limits its usefulness for extended trips.