 Researchers are trying to make models of the effects of procainamide and acecainide in animals.1-Aminobenzotriazole (ABT) is a nonselective inhibitor of cytochrome P450 enzymes, but recent research confirmed that this inhibitor also inhibit the RLS9-catalyzed "N"-acetylation of procainamide.In rats oral ABT decreases the clearance of intravenous procainamide for 45%, followed by a decreased acecainide-to-procainamide ratio in urine and plasma.