This term is often used to describe extra-label drug use. This means that a drug is used in a way other than what is described on the label or package insert. If a drug is used in a different species than what it has been approved for, this is extra-label use. Other examples include using a drug to treat a different condition than it is approved for or administering it in a different way than the directions describe. Extra-label drug use can only occur within the confines of a valid veterinarian-client-patient relationship.

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