Bioavailability refers to the proportion of a drug that enters the systemic circulation when introduced into the body and so is available for action or bioactivity. It is a key measure in pharmacokinetics to assess how much and how quickly a drug reaches the systemic circulation from its site of administration.

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Bioavailability Is

Question 8

Multiple Choice

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

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