Study of a timed-release preparation of pentaerythritol tetranitrate.
D000368:Aged; D002986:Clinical Trials as Topic; D003692:Delayed-Action Preparations; D005260:Female; D006331:Heart Diseases / Q000188:drug therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010417:Pentaerythritol Tetranitrate / Q000008:administration & dosage*
D003692:Delayed-Action Preparations; D010417:Pentaerythritol Tetranitrate