The primary emphasis of this book is on the understanding and applications of basic concepts and various pharmacokinetic parameters related to biopharmaceutics and pharmacokinetics. Biopharmaceutics is the study of the relationship between physico-chemical properties of the drug in a dosage form and the various pharmacologic, toxicological or therapeutic effects observed after the administration of the dosage form. Pharmacokinetic studies are useful in the maintenance of therapeutic drug concentration in the body and preventing danger of toxicity.