When we take medicine or drugs, they enter our bloodstream through various routes such as oral ingestion, injection, inhalation, or absorption through the skin. The drugs then travel through our bloodstream and get dispersed throughout the body. However, depending on the type of drug and the condition it is treating, it may need to be delivered to a specific part of the body.

To deliver drugs to a specific site, researchers have developed many targeted drug delivery systems. These systems use different techniques, such as encapsulating the drug in a specific carrier or attaching the drug to a specific molecule, to deliver the drug to the site of action. Additionally, some medications are designed to have a specific release rate or duration of action, which can affect how quickly it works and how long it remains in the body.
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