dil·ti·a·zem 
(dĭl-tīə-zĕm′)
(dĭl-tīə-zĕm′)n.
A calcium channel blocker drug, C22H26N2O4S, that acts as a coronary vasodilator and is used in the form of its hydrochloride to treat angina pectoris and hypertension.
[(VASO)DIL(ATOR) + -tiazem, suff. for calcium channel blockers (shortening and alteration of benzothiazepine, class of compounds : BENZO- + THI(O)- + AZ(O)- + EP(OXIDE) + -INE2).]