off-label

[ awf-ley-buhl, of‐ ]

adjectiveInformal.
  1. 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.

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British Dictionary definitions for off label

off label

adjective, adverb(off-label when prenominal)
  1. (of a prescription drug) relating to use, or being used, in ways for which it has not been approved

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