Q.

Bioavailability is

A. The difference between the amount of drug absorbed and the amount excreted
B. The proportion of the drug in a formulation that is found in the systemic circulation
C. The AUC relating plasma concentration of drug to time after administration
D. Always identical with different formulations of the same drug
E. A measure of the rate of absorption of a drug
Answer» B. The proportion of the drug in a formulation that is found in the systemic circulation

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