Sublingual immunotherapy (SLIT/Allergy Drops) is the name given to allergy extract that is administered orally. The allergy extract, rather than being administered by an injection, is administered as oral allergy drops that are placed under the tongue ("sublingual"), held there for two minutes, and then swallowed. Sublingual immunotherapy is a unique type of immunotherapy that combines safety and convenience with excellent efficiency. Popular in Europe for many years, sublingual immunotherapy is now being introduced into the United States and is gaining in popularity. Many patients prefer allergy immunotherapy because it treats the cause of inhalant allergies/asthma rather than merely treating the symptoms with medications.