Which administration route is used for medication that is absorbed through blood vessels under the tongue?

The sublingual administration route is specifically designed for medications that are absorbed directly into the bloodstream through the tissues located under the tongue. This method allows the drug to bypass the digestive system and the first-pass metabolism in the liver, leading to a faster onset of action. When a medication is placed under the tongue, it dissolves rapidly and enters the systemic circulation via the rich supply of blood vessels in that area.

This route is particularly effective for delivering certain types of drugs, such as nitroglycerin, where quick relief is necessary. The route is not related to inhalation, which involves breathing medication into the lungs; intramuscular, which refers to injections into muscle tissue; or topical, which involves application on the skin for localized effects. Using the sublingual route can provide a more efficient absorption for suitable medications, making it the correct choice in this scenario.