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In medicine, an indication is a valid reason to use a certain test, medication, procedure, or surgery.[1] The opposite of an indication is a contraindication,[2] a reason to withhold a certain medical treatment because it could harm a patient.
Drugs often have more than one indication, which means that there is more than one disease for which it is used. The Food and Drug Administration (FDA) classifies indications for drugs in the United States. Indications for drugs can be classified in two categories: FDA-approved, also called labeled indications, and.