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• W1967418493 abstract "In the obese, modifications in body constitution (higher percentage of fat and lower percentage of lean tissue and water) can affect drug distribution in the tissues. For slightly liposoluble molecules (e.g., digoxin, antipyrine), the equilibrium distribution volume (V), total and per kilogram weight, is significantly less than that of control subjects. With lipophilic drugs (e.g., barbiturates, benzodiazepines), this parameter is significantly increased, explaining the prolongation of the plasma elimination half-life. For drugs that are almost equally soluble in water and oil (methyl xanthines, aminoglycosides), the V is slightly increased in the obese. The other main factors involved in drug diffusion in the tissues are binding to plasma and tissue proteins, and regional blood flow. In the obese the binding of drugs to albumin does not seem to be altered. A marked increase in plasma alpha-glycoprotein acid and in propranolol binding has been reported in some studies; this has not been corroborated by other authors. Although the cardiac output and total blood volume are increased in the obese, the blood flow per gram of fat is less than in nonobese subjects. This could limit diffusion in the tissues of some lipophilic drugs. Studies on hepatic clearance of drugs are not available in the obese, but hepatic histological alterations have been described. In most publications concerning drugs with biotransformation as the principal elimination route, the total plasma clearance is not reduced. Up to the present, there are no reports of any impairment involving renal elimination of drugs in the obese. Dose-adjustment of hydrophilic drugs is assessed according to the ideal weight of the individual obese subject; with lipophilic drugs the loading dose can be fixed according to the total weight; calculation of the maintenance dose depends on possible changes in the total clearance." @default.
• W1967418493 created "2016-06-24" @default.
• W1967418493 creator A5069509986 @default.
• W1967418493 date "1988-05-06" @default.
• W1967418493 modified "2023-09-25" @default.
• W1967418493 title "DRUG PHARMACOKINETICS IN THE OBESE" @default.
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• W1967418493 doi "https://doi.org/10.1111/j.1472-8206.1988.tb00635.x" @default.
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