An Extra-Label Drug Use is an Antibiotic or other chemical used on the advice of a veterinarian in a dosage, route of administration, for a different disease or in some other manner not included on the approved printed package label.

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Other /More definition:
An Extra-Label Drug Use is an antibiotic or other chemical used on the advice of a veterinarian in a dosage, route of administration, for a different disease or in some other manner not included on the approved printed package label.