Sustained-release and instant-release verapamil in treatment of angina pectoris.
The efficacy of a sustained-release preparation of verapamil (verapamil-SR) has been compared with that of a conventional instant-release formulation (verapamil-IR) in 10 patients with stable angina pectoris treated for 3 weeks with both preparations. The diurnal serum concentrations of verapamil and norverapamil did not differ significantly during treatment with verapamil-IR 120 mg t.i.d. and verapamil-SR 360 mg once daily, but verapamil-SR 240 mg produced significantly lower serum concentrations. The differences did not affect the exercise capacity or the occurrence of ST-segment depression during maximal exercise. Verapamil-SR was well tolerated. A multiple instant-release dosage regime can now be replaced by once daily administration of the sustained-release preparation.
Medical Department, Københavns Kommunehospital, Copenhagen, Denmark.
C M
CM
Jespersen
N A
NA
Klitgaard
H
H
Nielsen
J F
JF
Hansen
D000787:Angina Pectoris / Q000188:drug therapy*; D003692:Delayed-Action Preparations; D004311:Double-Blind Method; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006439:Hemodynamics; D006801:Humans; D008297:Male; D014700:Verapamil / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000097:blood / Q000627:therapeutic use*
D003692:Delayed-Action Preparations; C016904:norverapamil; D014700:Verapamil