sublinguales

Sublinguales is a term used to describe things located beneath the tongue. In medical contexts, it most often refers to two related concepts: the sublingual glands, a set of salivary glands located on the floor of the mouth, and sublingual drug delivery, a route for administering medications by placing them under the tongue for absorption through the oral mucosa.

Anatomy and function: The major sublingual glands sit beneath the tongue and contribute mucous-rich saliva that helps lubricate the oral cavity. They drain through several small ducts called ducts of Rivinus, and a larger duct known as Bartholin’s duct may drain into the sublingual caruncle, sometimes joining the submandibular duct. In addition to these major glands, numerous minor sublingual glands are dispersed along the floor of the mouth. Saliva production is influenced by autonomic nerves, with parasympathetic activity increasing flow.

Sublingual drug delivery: When a medication is formulated for sublingual administration, the drug is placed under the tongue to dissolve and be absorbed across the oral mucosa into the systemic circulation. Advantages include rapid onset and avoidance of gastric degradation and first-pass metabolism in the liver. Limitations include a small absorption surface, moisture and saliva variability, and the requirement for relatively small, potent doses. Not all drugs are suitable for this route.

Examples and use: Common sublingual drugs include nitroglycerin for acute chest pain, certain analgesics such as fentanyl, and buprenorphine for pain or addiction treatment. Nicotine replacement therapies also use sublingual formats. Proper usage generally involves letting the product dissolve without chewing and avoiding eating or drinking until absorption is underway; dosing should follow medical guidance.

See also: Sublingual glands, first-pass metabolism, oral mucosa.