The efficacy of a slow-release formulation of verapamil.
D003692:Delayed-Action Preparations; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D014700:Verapamil / Q000008:administration & dosage / Q000627:therapeutic use*
D003692:Delayed-Action Preparations; D014700:Verapamil