What term is used to describe a drug administered under the skin?

Subcutaneous refers to the administration of a drug just beneath the skin. This method allows for slower absorption into the bloodstream compared to other routes, providing a steady release of the medication over time. Subcutaneous injections are often used for medications like insulin and certain vaccines, where a gradual effect is desired. This route is advantageous because it is relatively simple to perform, can be done with minimal equipment, and is suitable for self-administration by patients.

In contrast, intranasal administration involves delivering medication through the nasal passages. Topical refers to medications applied directly to the skin or mucous membranes for localized effect. Intravenous administration involves delivering medication directly into the bloodstream through a vein, providing immediate effect but requiring more skill and equipment. Each of these routes has specific uses and benefits, but subcutaneous is the distinct method for delivering medications just under the skin's surface.