What defines a transdermal delivery system?

A transdermal delivery system is specifically designed to administer medication through the skin, allowing the drug to enter the bloodstream directly from the site of application. This method utilizes medicated patches that contain specific doses of medication, which are absorbed through the skin over a period of time. This route of administration is beneficial for maintaining consistent drug levels in the body, providing a steady release of medication without the need for frequent dosing compared to other methods.

In comparison, the other options describe different types of drug delivery or monitoring systems that do not align with the definition of a transdermal system. Oral medications dissolve in the stomach and rely on the gastrointestinal tract for absorption, while injections introduce medication directly into the bloodstream. A glucose monitoring device, on the other hand, serves a completely different purpose focused on measuring blood sugar levels rather than delivering medication.