Alosetron and Clarithromycin Interaction

Understanding the Alosetron and Clarithromycin Interaction

FDA-approved prescribing information for these two drugs flags their combination as a moderate-severity interaction. Alosetron belongs to the 5-HT3 Antagonist (IBS-D) class and Clarithromycin belongs to the Macrolide Antibiotic class - two categories that can collide when co-prescribed. The mechanism described in FDA labeling is: Clarithromycin blocks the enzymes that break down alosetron, which could lead to higher levels of alosetron in your body. Severity tiers matter: major flags generally advise avoidance, moderate flags often require monitoring or dose adjustment, and minor flags may only call for awareness.

Context around a specific patient determines real-world impact. Alosetron has 12 total documented interactions on file in this dataset, and Clarithromycin has 81. Each additional medication compounds the interaction surface, which is why pharmacists run full-profile checks rather than evaluating one pair at a time. FDA-derived guidance for this pair is: Use this combination with caution and tell your doctor if you notice any new side effects. Timing of doses, renal and hepatic function, age, and other concurrent prescriptions all shape whether a labeled interaction matters clinically.

An interaction flag is not a verdict. A large share of labeled interactions are managed routinely in clinical practice, the fix may be as simple as spacing doses or adding a monitoring test. Others require the prescriber to choose a different medication entirely. This page surfaces FDA-sourced labeling and openFDA data for educational purposes only; it is not medical advice and cannot account for your full clinical picture. Never start, stop, or adjust either Alosetron or Clarithromycin based on a web page, speak with your prescriber or pharmacist before making any change.