Topical medication administration uses which route?

Subcutaneous administration involves injecting medication into the tissue layer between the skin and muscle. While it is a valid route for certain medications, it is not classified as topical because it bypasses the skin's surface for direct entry into the bloodstream, rather than delivering a medication through the skin itself.

Intramuscular administration involves injecting medication directly into a muscle, allowing for rapid absorption into the bloodstream. This route is not considered topical because it does not utilize the skin as a medium for drug delivery, instead providing a more invasive method of administration.

Percutaneous administration refers to the absorption of substances through the skin but is often associated with local effects rather than systemic absorption. While related to topical applications, it does not specifically denote the method of delivering medication like transdermal does, which is intended for systemic effects.