off-label
UK[ˌɒf ˈleɪbəl]US[ˌɔːf ˈleɪbəl]
adj
(of the use of a drug or medical device) not officially approved for a particular treatment or condition by the regulatory authority (such as the FDA in the US), though it may be legally prescribed by a doctor.
adv
in a way that involves the off-label use of a drug or device.
Morpheme Breakdown
off
label
off
away from, not
label
descriptive tag
Etymology
The term "off-label" is a modern compound, originating in the late 20th century within the context of pharmaceutical regulation. It is formed from the common adverb/preposition "off," implying deviation or separation, and the noun "label," referring to the officially approved uses printed on a drug's packaging or prescribing information. The compound's logic is transparent: it describes the use of a medication in a manner that deviates from or falls outside the scope of what is listed on its official regulatory label. This term encapsulates the legal and clinical distinction between approved, marketed indications and evidence-based but unapproved applications of medical treatments.
Analysis
Structure: off (away from, not) + label (descriptive tag)
- off: Old English, of, æf; a preposition/adverb/adjective prefix meaning "away, away from, from, off, not."
- label: Middle English, from Anglo-French, meaning a narrow strip, ribbon, or a slip of paper; its modern sense of a descriptive tag or identification arose in the 17th century.
Examples
The doctor prescribed the medication for an off-label use to treat the rare condition.
This antidepressant is sometimes used off-label to manage chronic pain.
Off-label prescribing is common in pediatric oncology, as many drugs are not formally tested on children.