Interstitial granulomatous dermatitis associated with darifenacin.

Interstitial granulomatous dermatitis is most commonly associated with rheumatoid arthritis (RA) but may be induced by medications as well. Darifenacin is a muscarinic antagonist which was FDA approved for the treatment of overactive bladder in December 2004. The authors describe a case of interstitial granulomatous dermatitis associated with darifenacin.