(S)-Verapamilhydrochloride is an inhibitor of leukotriene C4 (LTC4) and calcein transport by MRP1,and leads to the death of potentially resistant tumor cells.
NSC-609249 hydrochloride, an impurity of Verapamil, is a calcium channel blocker with potent orally active properties. It also functions as a first-generation P-glycoprotein (P-gp) inhibitor.