Estimation of Plasma Tacrine Concentrations Using An In Vitro Cholinesterase Inhibition Assay

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THA (9-amino, 1,2,3,4-tetrahydroacridine; tacrine) is currently under study as a cholinesterase (ChE) inhibitor in Alzheimer disease. In this study, a sensitive radiometric assay for THA inhibition of human plasma ChE, suitable for detection of effects of orally administered drug, is described. The assay is sensitive in a range of 4–50 ng/ml plasma. Reversibility of the inhibition permits distinguishing of drug effects on ChE from changes in amount of enzyme synthesized during treatment.

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