Dictionary.com

off-label

[ awf-ley-buhl, 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.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012