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A model solution for intestinal absorption of warfarin. A drug with non-linear distribution pharmacokinetics in the rat. 1980

R J Julkunen, and M Kekki, and B Wahlström

A non-linear multicompartment model with saturation kinetics of binding to plasma and interstitial fluid proteins and with non-saturable binding to tissues has been applied to the absorption of warfarin (8 mg/kg of warfarin sodium) from the rat small intestine in situ. The absorption was best described with two pathways, one into plasma and the other instantaneously into the interstitial fluid. According to the results from the best computerized curve fitting, absorption is rapid, the apparent absorption rate constant being 0.258 min -1. At hypothetical zero time 0.253 of the dose (1.0) would be located in plasma, 0.597 in interstitial fluid 0.150 in tissues.

UI MeSH Term Description Entries
D007275 Injections, Intravenous Injections made into a vein for therapeutic or experimental purposes. Intravenous Injections,Injection, Intravenous,Intravenous Injection
D007408 Intestinal Absorption Uptake of substances through the lining of the INTESTINES. Absorption, Intestinal
D007700 Kinetics The rate dynamics in chemical or physical systems.
D008297 Male Males
D008954 Models, Biological Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment. Biological Model,Biological Models,Model, Biological,Models, Biologic,Biologic Model,Biologic Models,Model, Biologic
D003203 Computers, Hybrid Computers that combine the functions of analog and digital computers. (Sippl, Computer Dictionary, 4th ed) Computer, Hybrid,Hybrid Computer,Hybrid Computers
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013997 Time Factors Elements of limited time intervals, contributing to particular results or situations. Time Series,Factor, Time,Time Factor
D014859 Warfarin An anticoagulant that acts by inhibiting the synthesis of vitamin K-dependent coagulation factors. Warfarin is indicated for the prophylaxis and/or treatment of venous thrombosis and its extension, pulmonary embolism, and atrial fibrillation with embolization. It is also used as an adjunct in the prophylaxis of systemic embolism after myocardial infarction. Warfarin is also used as a rodenticide. 4-Hydroxy-3-(3-oxo-1-phenylbutyl)-2H-1-benzopyran-2-one,Aldocumar,Apo-Warfarin,Coumadin,Coumadine,Gen-Warfarin,Marevan,Tedicumar,Warfant,Warfarin Potassium,Warfarin Sodium,Potassium, Warfarin,Sodium, Warfarin
D051381 Rats The common name for the genus Rattus. Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus

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