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RESEARCH PRODUCT

How and Where are Drugs Absorbed?

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A drug must interact with its receptors at their action sites or therapeutic target to exert its pharmacological or toxic effects. Therefore, the absorption of drug is an essential step which determines pharmacologic effects of drug. This article focuses on the biological barriers that the drug must cross in order to enter the body, drug absorption mechanisms, and influence of physiological characteristics of the administration route on absorption rate and extent. Keywords: drugs; absorption mechanisms; administration routes; passive diffusion; endocytosis