alosetron vs lubiprostone
Side-by-side comparison of alosetron and lubiprostone Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Lotronex
Amitiza
Alosetron (Lotronex) is a medicine for women with severe diarrhea-predominant irritable bowel syndrome (IBS). It helps to reduce diarrhea and stomach pain.
Lubiprostone is a medicine that helps treat constipation. It works by increasing fluid in your intestines, which makes it easier to pass stool.
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 chronic idiopathic constipation (CIC) in adults. This means you have ongoing constipation with no known cause. It also treats opioid-induced constipation (OIC) in adults who have chronic pain that is not from cancer. Lubiprostone can also treat irritable bowel syndrome with constipation (IBS-C) in women 18 years and older.
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.
Lubiprostone is a chloride channel activator. It works by increasing the amount of fluid in your intestines. This helps to soften your stool and make it easier to have a bowel movement.
- • Constipation
- • Abdominal discomfort and pain
- • Nausea
- • Gastrointestinal discomfort and pain
- • Nausea
- • Diarrhea
- • Headache
- • Abdominal pain
- • Abdominal bloating
- 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
- Feeling sick to your stomach 765
- Shortness of breath 622
- Loose, watery stools 581
- Difficulty passing stools 559
- Medicine not working 544
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.
You should not take this medicine if you have a known or suspected blockage in your intestines. This medicine can cause nausea, diarrhea, fainting, low blood pressure, and shortness of breath. If you have severe diarrhea while taking this medicine, stop taking it and call your doctor.
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.
This medicine may harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if this medicine passes into breast milk, so talk to your doctor if you are breastfeeding.
How to Read This alosetron vs lubiprostone Comparison
alosetron is classified in the 5-HT3 Antagonist (IBS-D) drug class, while lubiprostone sits within the Chloride Channel Activator 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 lubiprostone has 3,071. 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 lubiprostone — 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.