alosetron vs rabeprazole
Side-by-side comparison of alosetron and rabeprazole Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Lotronex
Aciphex
Alosetron (Lotronex) is a medicine for women with severe diarrhea-predominant irritable bowel syndrome (IBS). It helps to reduce diarrhea and stomach pain.
Rabeprazole (Aciphex) is a medicine that reduces the amount of acid your stomach makes. It belongs to a class of drugs called proton pump inhibitors (PPIs).
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 treat several conditions caused by too much stomach acid. It can heal damage to your esophagus from acid reflux (GERD). It also treats heartburn, stomach ulcers, and conditions like Zollinger-Ellison syndrome where the body makes too much acid. Rabeprazole can also be used with antibiotics to get rid of a bacteria called H. pylori that can cause ulcers.
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.
Rabeprazole works by blocking the enzyme in your stomach that produces acid. This helps to lower the amount of acid in your stomach. Lowering stomach acid helps to heal damage and relieve symptoms.
- • Constipation
- • Abdominal discomfort and pain
- • Nausea
- • Gastrointestinal discomfort and pain
- • Pain
- • Sore throat
- • Gas
- • Infection
- • 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
- The medicine is not working 1,859
- Using the medicine for a condition it's not approved for 1,771
- Feeling sick to your stomach 1,543
- Loose, watery stools 1,318
- Aches or soreness 1,314
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.
Taking PPIs like rabeprazole may hide signs of stomach cancer, so tell your doctor if your symptoms don't improve. This medicine may also increase your risk of bone fractures, especially if you take it for a long time or at high doses. Long-term use may also cause low vitamin B12 or magnesium levels. Contact your doctor right away if you experience signs of hypersensitivity.
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.
It is not known if rabeprazole is safe to use during pregnancy. Talk to your doctor if you are pregnant, plan to become pregnant, or are breastfeeding.
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How to Read This alosetron vs rabeprazole Comparison
alosetron is classified in the 5-HT3 Antagonist (IBS-D) drug class, while rabeprazole sits within the Proton Pump Inhibitor (PPI) class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
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 rabeprazole has 7,805. 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 rabeprazole — 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.