A route of medicine administration in which the medicine is placed under the tongue. These medications can come in the form of tablets, films, or sprays. It is an extremely fast pharmacological route of absorption, as medicines diffuse rapidly into the blood through tissues under the tongue. This is especially effective in an emergency when the medication needs to work immediately like during a heart attack. Another advantage is that the medicine does not go through the digestive system, so it is not metabolised through the liver, and thus a lower dose can be used.