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off-la·bel | \ ˈȯf-ˌlā-bəl 
\
\Definition of off-label
: of, relating to, or being a drug used to treat a condition for which it has not been officially approved
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off-label
adjectiveoff-la·bel | \ ˌȯf-ˌlā-bəl \
\Medical Definition of off-label
: of, relating to, or being an approved drug legally prescribed or a medical device legally used by a physician for a purpose (as the treatment of children or of a certain disease or condition) for which it has not been specifically approved (as by the United States Food and Drug Administration)
the off-label use of oral contraceptives to treat dysmenorrhea
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Time Traveler for off-label
The first known use of off-label was in 1987
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