2. Adverb. (alternative spelling of off label) ¹
¹ Source: wiktionary.com
Medical Definition of Off-label
1. Use of a drug for a disease or condition other than the indication for which it was approved by the FDA. For example: many doctors prescribe paromomycin (humatin) for cryptosporidiosis, although it is not approved for treating this disease. (09 Oct 1997)