Pharmacokinetics of N-acetylcysteine in man.
N-Acetylcysteine was given intravenously and as three fast dissolving and one slow-release formulation, on separate occasions, as a single dose of 600 mg to 10 fasting (5 men and 5 women) healthy volunteers. Blood and urine were sampled for the following 12 h. Renal clearance constituted around 30% of total body clearance, which was 0.21 l/h/kg. Volume of distribution was 0.33 l/kg, consistent with distribution mainly to extracellular water. The late elimination half-life was 2.27 h and the mean residence time 1.62 h. The slow-release tablet resulted in a flattened plasma concentration-time curve typical of slow release formulations, while the other three oral formulations were rapidly absorbed. The oral availability of N-acetylcysteine varied between 6 and 10%, with the slow-release tablet having the lowest and the fast dissolving tablet the highest availability.
D000111:Acetylcysteine / Q000008:administration & dosage / Q000378:metabolism*; D000284:Administration, Oral; D000328:Adult; D001682:Biological Availability; D003692:Delayed-Action Preparations; D005260:Female; D006207:Half-Life; D006801:Humans; D007262:Infusions, Intravenous; D007700:Kinetics; D008297:Male; D008657:Metabolic Clearance Rate; D012996:Solutions
D003692:Delayed-Action Preparations; D012996:Solutions; D000111:Acetylcysteine