off-label

[ awf-ley-buh l, of‐ ]
/ ˈɔfˈleɪ bəl, ˈɒf‐ /

adjective Informal.

of, relating to, or denoting a drug prescribed for a particular indication even though the drug has not yet received approval from the Food and Drug Administration for that disease, condition, or symptom.

British Dictionary definitions for off label

off label

adjective, adverb (off-label when prenominal)

(of a prescription drug) relating to use, or being used, in ways for which it has not been approved