DDS = Drug Delivery System

Effects of a drug develop when the drug administered in the body reaches the intended target region. With the traditional drug administration method, the drug administered in the body cannot efficiently reach the intended target region. Further, the drug may be metabolized or evacuated or trapped by some region. Therefore, it is hard to maintain the efficient concentration.

As a result, the volume of the drug to be administered increases because the necessary concentration for exercising pharmacological activity must be maintained throughout the entire body, and side effects may arise. Such a drawback can be overcome by preparing a target-oriented drug product and making an adjustment so that the drug will reach the efficient concentration at the target region. The system that “makes the necessary volume of drug reach the necessary region when necessary” in such a way is the DDS.