Routes of Administration

inhalation

vapor or gas is inhaled though the nose or mouth and absorbed into
the bloodstream through the lungs

oral

drug is taken by mouth and is absorbed into the bloodstream through
the stomach or small intestine (may also be called enteral administration)

parenteral

drug is administered by injection using a needle and syringe or a
needle an intravenous (IV) tubing

rectal

drug is administered in the form of a suppository or liquid and is
inserted into the rectum

sublingual

drug is placed under the tongue and is absorbed into the blood
vessels there

topical

drug is applied to a particular area for local action (generally
lotions, ointments, eye drops and ear drops)

transdermal

drug is absorbed into the bloodstream through the skin by means of a
controlled release patch