Darifenacin and Itraconazole Interaction

Understanding the Darifenacin and Itraconazole Interaction

FDA-approved prescribing information for these two drugs flags their combination as a moderate-severity interaction. Darifenacin belongs to the Anticholinergic (Overactive Bladder) class and Itraconazole belongs to the Azole Antifungal class - two categories that can collide when co-prescribed. The mechanism described in FDA labeling is: Itraconazole interferes with the enzymes that remove darifenacin from your body, leading to higher levels of the drug in your blood. 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. Darifenacin has 18 total documented interactions on file in this dataset, and Itraconazole has 116. 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: You should not use these two medicines at the same time or for two weeks after you finish taking itraconazole. 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 Darifenacin or Itraconazole based on a web page, speak with your prescriber or pharmacist before making any change.