title: The metabolism of [14C]N-ethoxycarbonyl-3-morpholinosydnonimine (molsidomine) in man.
abstract: [14C]-N-Ethoxycarbonyl-3-morpholinosydnonimine (molsidomine, Corvaton) was administered orally at a dose of 2 mg per subject to eight healthy male volunteers. Maximal plasma concentrations of total radioactivity of 32.4 +/- 6.4 ng equiv./ml (mean +/- S.D.) were detected compared with maximum plasma concentrations of 14.1 +/- 5.9 ng/ml (mean +/- S.D.) of molsidomine. In both cases these were attained at 0.5 h after dosing. From the peak, concentrations of parent drug fell rapidly with a half-life of 1.25 +/- 0.38 h (mean +/- S.D.). In contrast, total radioactivity declined more slowly with a terminal half-life of 138 +/- 42.7 h (mean +/- S.D.). The bulk of the radiolabel was rapidly excreted as metabolites in the urine, with over 85% of the dose recovered in the first 24 h. The main urinary radiolabelled metabolites appeared, from chromatographic evidence, to be similar to those previously identified in animals, namely N-morpholinosydnonimine, N-cyanomethylamino-N-(2'-hydroxyethyl)glycine and (N-cyanomethylenamino-2-aminoethoxy)-acetic acid.
mesh_terms: D000284:Administration, Oral; D000328:Adult; D001711:Biotransformation; D006801:Humans; D007700:Kinetics; D008657:Metabolic Clearance Rate; D008875:Middle Aged; D008981:Molsidomine / Q000378:metabolism* / Q000652:urine
chemical_list: D008981:Molsidomine