alosetron vs bismuth subsalicylate
Side-by-side comparison of alosetron and bismuth subsalicylate Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Lotronex
Pepto-Bismol
Alosetron (Lotronex) is a medicine for women with severe diarrhea-predominant irritable bowel syndrome (IBS). It helps to reduce diarrhea and stomach pain.
Bismuth subsalicylate (Pepto-Bismol) is a medicine that can treat diarrhea and upset stomach. It works as both an antidiarrheal and an antacid.
Alosetron is used to treat severe diarrhea-predominant irritable bowel syndrome (IBS) in women. It is for women whose IBS symptoms have lasted for 6 months or longer. You should have already ruled out other possible causes of your symptoms. This medicine is only for you if other treatments have not worked well enough.
This medicine can help with traveler's diarrhea. You can also use it for an upset stomach if you eat or drink too much. It can relieve heartburn, indigestion, nausea, gas, belching, and feeling too full.
Alosetron blocks a substance called serotonin in your gut. Serotonin can speed up bowel movements. By blocking serotonin, alosetron slows down your bowel and reduces diarrhea.
Bismuth subsalicylate works by coating your stomach and intestines. This helps to reduce inflammation and kill certain bacteria that can cause diarrhea. It also helps to reduce the amount of fluid that is secreted into your digestive tract.
- • Constipation
- • Abdominal discomfort and pain
- • Nausea
- • Gastrointestinal discomfort and pain
- • Diarrhea
- • Nausea
- • Vomiting
- • Headache
- • Constipation
- Medicine not working 11
- Diarrhea 10
- Feeling sick to your stomach 8
- Using the medicine for something it's not approved for 7
- Stomach pain 6
- Long-term kidney disease 1,418
- Sudden kidney damage 822
- Kidney failure 724
- Diarrhea 711
- Nausea 615
Alosetron can cause serious gut problems, like ischemic colitis (reduced blood flow to the bowel) and severe constipation. These problems can lead to hospitalization, surgery, or even death. Stop taking alosetron right away if you get constipated or have symptoms of ischemic colitis, like bloody diarrhea or bad stomach pain. Call your doctor immediately.
Ask a doctor before giving this medicine to children under 12 years old.
It is not known if alosetron can harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is also not known if alosetron passes into breast milk. Talk to your doctor about the best way to feed your baby if you take alosetron.
Ask a doctor if it is safe for you to take this medicine while pregnant or breastfeeding. It is not known if this medicine will harm your unborn baby or pass into your breast milk.
How to Read This alosetron vs bismuth subsalicylate Comparison
alosetron is classified in the 5-HT3 Antagonist (IBS-D) drug class, while bismuth subsalicylate sits within the Antidiarrheal / Antacid class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are split between OTC and prescription status, which affects access and supervision.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, alosetron has 42 submissions while bismuth subsalicylate has 4,290. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between alosetron and bismuth subsalicylate — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.