the ki values were as follows , in order of decreasing apparent affinity : quinidine ( 0.7 microm ) , trimehoprim ( 1.3 microm ) , cimetidine ( 2.0 microm ) , famotidine ( 3.0 microm ) , quinine ( 7.0 microm ) , amiloride ( 5.8 microm ) , procainamide ( 21 microm ) , and nizatidine ( 30 microm ) .
C0034414
quinidine
C0034417
quinine