Extralabel drug use describes the use of an approved medication in a way that differs from what its official labeling specifies — for example, in a different species, at a different dose, or for a different condition than the label covers. The term is most commonly encountered in veterinary pharmacy practice, where labeled uses are often limited and animal-specific needs frequently fall outside what a product’s approval covers.
Because extralabel use departs from the tested and approved conditions on a drug’s labeling, it is generally permitted only within a defined relationship and set of circumstances, rather than being treated as an ordinary dispensing decision. Pharmacies that fill veterinary prescriptions involving extralabel use, or that compound medications for animal patients, operate under additional considerations layered on top of standard dispensing practice.
Why it matters
Pharmacists who fill veterinary prescriptions need to recognize when a prescription involves extralabel use so they can apply the appropriate additional scrutiny and recordkeeping, rather than treating it as a routine fill. This topic also intersects with compounding, since extralabel use for animal patients frequently involves a compounded preparation rather than a commercially available product used as labeled. Veterinary and compounding pharmacy practice both carry their own layers of oversight on top of general pharmacy licensure.
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