Bioanalysis of drug substance and drug product is a subdiscipline of analytical chemistry for the quantitative determination of drugs in biological matrix such as whole blood, plasma, serum, tissue and urine. It has witnessed a remarkable flow, both in the development of more selective and effective drugs and in understanding their therapeutic and toxic effects. Knowledge of drug levels in body fluids allows the optimization of pharmacotherapy and provides a basis for the evaluation and interpretation of patient compliance, bioavailability, bioequivalence and pharmacokinetics. Pharmacokinetic...