Graduate Pharmacy Aptitude Test (GPAT) 2016 Solved Paper

Bio availability of drug refers to
(P) The ratio of drug excreted unchanged in urine to that excreted as metabolites
(Q) Fraction of the drug reaching the target to produce the action
(R) The length of time an administered drug is available for action
(S) Percentages of administered dose that reaches systemic circulation in the unchanged form