Distribution

Drug distribution in elderly patients may be altered by hypoalbuminemia, qualitative changes in drug-binding sites, reductions in relative muscle mass, increases in the proportion of body fat, and decreases in total body water. The plasma level of free, active drug is often a direct function of the extent of drug binding to plasma proteins. There is a well-documented age-dependent decline (about 20%) in plasma albumin concentration in humans due to a reduced rate of hepatic albumin

L TABLE 6.5 Plasma Half-lives of Several Drugs in Young Adult and Elderly Patients

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