title: Antianginal efficacy and safety of controlled-delivery diltiazem QD versus an equivalent dose of immediate-release diltiazem TID.
abstract: Controlled-delivery once-daily diltiazem (qd), 180 mg and 360 mg, was assessed in two multicenter, randomized, double-blind, placebo-controlled trials using a 3 x 3 Latin square design. Both studies compared the controlled-delivery dosage form to the same total daily dose of immediate-release diltiazem administered three times daily (tid) and to placebo. The primary measure of efficacy was the time to termination of the exercise tolerance test (ETT) at 2, 8, and 24 hours after the morning dose. There were no significant differences in time to ETT termination between the qd and tid formulations at any time, except at 24 hours with 180 mg qd versus 60 mg tid. The comparison to placebo showed that diltiazem 180 mg qd, 360 mg qd, and 120 mg tid significantly lengthened the time to ETT termination (p < 0.05) at all time points, while diltiazem 60 mg tid did not differ from placebo at any time point. The qd formulation also increased the time to 1-mm ST-segment depression and reduced the number of angina attacks and the amount of nitroglycerin used when compared to placebo. No new or unusual adverse events were noted. Diltiazem controlled-release capsules administered once daily are safe and effective for the treatment of patients with chronic stable angina.
authors.affiliation: Royal Alexandra Hospital, Edmonton, Alberta.
authors.forename: W P
authors.initials: WP
authors.lastname: Klinke
authors.forename: M
authors.initials: M
authors.lastname: Baird
authors.forename: M
authors.initials: M
authors.lastname: Juneau
authors.forename: D
authors.initials: D
authors.lastname: Waters
authors.forename: W
authors.initials: W
authors.lastname: Warnica
authors.forename: Z
authors.initials: Z
authors.lastname: Lakhani
authors.forename: L
authors.initials: L
authors.lastname: Annable
authors.forename: A P
authors.initials: AP
authors.lastname: Boulet
authors.forename: L
authors.initials: L
authors.lastname: Larivière
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D000787:Angina Pectoris / Q000188:drug therapy*; D001794:Blood Pressure / Q000187:drug effects; D002214:Capsules; D003692:Delayed-Action Preparations; D004110:Diltiazem / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D005080:Exercise Test; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D005996:Nitroglycerin / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D013607:Tablets; D013810:Therapeutic Equivalency
chemical_list: D002214:Capsules; D003692:Delayed-Action Preparations; D013607:Tablets; D004110:Diltiazem; D005996:Nitroglycerin