If the patient is a non-food-producing animal, a human drug may be considered if there is no approved, appropriate animal drug that is labeled for use in that species or if the approved drug exists but is found by a veterinarian to be clinically ineffective. Alternatively, a veterinarian can still choose to prescribe an equivalent human-labeled drug for the non-food-producing animals, even if an appropriate drug exists for that species and medical condition.
If the patient is a food-producing animal, a human drug may be considered if the same criteria listed above apply, if the drug is not prohibited from use in food-producing animals, and if there is adequate scientific information available to determine a withdrawal time.
