Drug delivery is a method of delivering the therapeutically active drugs to desired location inside the body without causing any side effects. Drug delivery is a concept which includes the dosage form and routes of administration and also the engineering of delivery system of different drugs with same routes. It is a very broad field of research to find different methods of reaching of drug to various parts of the body and this field is likely to expand in future perspective. The drug delivery should be targeted, steady and controlled. The delivery of drugs includes various routes and vehicles to reach the targeted site. Drug delivery technology progressed to become a fundamental tool for the enrichment of pharmacoki-nectic properties of drugs, reducing side effects and bringing about superior clinical results.