An appropriate veterinarian/client/patient relationship will exist when: 

1. The producer (client) may make a diagnosis. The veterinarian has assumed the responsibility for making medical judgments regarding the health of the animals and the need for medical treatment, and the client (owner or other caretaker) has agreed to follow the instructions of the veterinarian.
2. There is sufficient knowledge of the animal by the veterinarian to initiate at least a general or preliminary diagnosis of the medical condition of the animals(s). This means that the veterinarian has recently seen and is personally acquainted with the keeping and care of the animals by virtue of an examination of the animals and/or by medically appropriate and timely visits to the premises where the animals are kept.
3. When the practicing veterinarian is readily available for follow-up in case of adverse reactions or failure of the regimen of therapy.

A valid VCPR:

• Is mandatory if drugs are to be used in an “extra-label” manner on your farm. You need the benefit of a valid VCPR to make sure you are following the veterinarian’s instructions properly.  
• Emphasizes the word “valid.” Much of this responsibility is on your veterinarian.  He or she must visit your facilities routinely to see and be personally acquainted with your animal care. Consult your veterinary clinic for specific requirements.
• Is a commitment on your veterinarian’s part. It is important that the veterinarian is available to follow up in cases of adverse reactions or failures of the regimen therapy.