title: Food-induced gastric retention and absorption of sustained-release procainamide.
abstract: The relationship between variations in the gastric residence time and the absorption of procainamide from a waxed matrix, sustained-release tablet was evaluated in a repeated-measures study conducted in eight healthy men. Subjects received sustained-release procainamide together with a Heidelberg capsule, alone and with food. Blood and urine samples were collected for up to 24 hours before and after gastric emptying of the Heidelberg capsule for procainamide and N-acetylprocainamide concentration determinations. The gastric residence time of the Heidelberg capsule was prolonged by food (median 3.5 [range 1.5 to 10.0] vs. 1.0 [range 0.5 to 2.5] hours; P less than 0.02). No significant differences (median [range]; fasting vs. fed) in procainamide lag time (0.5 [0.5 to 1.0] vs. 0.5 [0.5 to 1.5] hours) or time at which peak procainamide plasma concentrations occurred (2.9 [1.0 to 4.3] vs. 2.8 [2.0 to 6.0] hours) were evident with feeding. Slight increases in procainamide AUC and peak concentrations occurred with feeding. No alteration in the extent of urinary excretion of procainamide or N-acetylprocainamide occurred with feeding. Thus food did not influence the absorption of sustained-release procainamide despite apparent prolonged gastric retention.
mesh_terms: D000120:Acecainide / Q000097:blood / Q000378:metabolism / Q000652:urine; D000328:Adult; D001682:Biological Availability; D003692:Delayed-Action Preparations; D005502:Food; D005746:Gastric Emptying; D006801:Humans; D007408:Intestinal Absorption; D007700:Kinetics; D008297:Male; D011342:Procainamide / Q000097:blood / Q000378:metabolism* / Q000652:urine
chemical_list: D003692:Delayed-Action Preparations; D000120:Acecainide; D011342:Procainamide