How is a transdermal patch used for medication?

A transdermal patch is specifically designed to deliver medication directly through the skin, allowing for absorption into the bloodstream. This method of administration provides a steady release of medication over an extended period, which can enhance therapeutic effects and improve patient compliance since it eliminates the need for frequent dosing.

The other options describe different methods of medication administration that are not applicable to transdermal patches. For instance, applying medication to mucous membranes or placing it inside the mouth are routes typically associated with tablets, lozenges, or other forms of oral medications. Inhalation through the lungs is also a distinct route typically used with respiratory medications, which is not relevant when discussing transdermal systems. Overall, the transdermal patch's unique delivery method is what makes its application to the skin the correct choice.