alosetron vs omeprazole
PlainMeds reviewed this comparison against our methodology in August 2026. It places FDA and CMS record fields side by side, without recommending either medication.
Side-by-side comparison of alosetron and omeprazole. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Lotronex
Prilosec
Alosetron (Lotronex) is a medicine for women with severe diarrhea-predominant irritable bowel syndrome (IBS). It helps to reduce diarrhea and stomach pain.
Omeprazole (Prilosec) is a medicine that reduces the amount of acid in your stomach. 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 treats frequent heartburn, which is heartburn that occurs 2 or more days a week. It is not meant to give you immediate relief from heartburn. It may take 1 to 4 days for the medicine to fully work.
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.
Omeprazole works by blocking the production of acid in your stomach. It does this by targeting the cells that make stomach acid. This helps to reduce heartburn symptoms.
- • Constipation
- • Abdominal discomfort and pain
- • Nausea
- • Gastrointestinal discomfort and pain
- • Headache
- Diarrhoea 10
- Nausea 8
- Abdominal Pain 6
- Death 6
- Constipation 5
- Fatigue 19,901
- Nausea 19,842
- Diarrhoea 19,627
- Dyspnoea 16,336
- Headache 14,629
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.
Children under 18 should ask a doctor before use. Heartburn in children may be a sign of a serious condition.
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.
Talk to your doctor if you are pregnant or breastfeeding before taking this medicine. It is important to weigh the benefits and risks with your doctor.
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How to Read This alosetron vs omeprazole Comparison
alosetron is classified in the 5-HT3 Antagonist (IBS-D) drug class, while omeprazole 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 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 35 submissions while omeprazole has 90,335. 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 represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for alosetron or omeprazole.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.