1. Introduction

Drug delivery refers to the approaches or methods or technologies of administering or transporting active pharmaceutical ingredient(s) and other xenobiotics through different routes for achieving the desired therapeutic effect in human or animal safely. The pharmacokinetics and pharmacodynamics issues of drugs are the most important considerations of drug delivery which is profoundly integrated with dosage form and route of administration. The kinetics of drug release, drug concentration profile in the plasma, onset of action, duration of action, site of action, and side effects of a drug deeply influenced by the DDS.
