Licorice may interfere with several medications processed by the liver, including celecoxib (Celebrex), diclofenac (Voltaren), fluvastatin (Lescol), glipizide (Glucotrol), ibuprofen (Advil, Motrin), phenytoin (Dilantin), piroxicam (Feldene), phenobarbital, and secobarbital (Seconal).