Section 14401 Of Chapter 4.5. Livestock: Use Of Antimicrobial Drugs From California Food And Agricultural Code >> Division 7. >> Chapter 4.5.

. Beginning January 1, 2018, a medically important antimicrobial drug shall not be administered to livestock unless ordered by a licensed veterinarian through a prescription or veterinary feed directive, pursuant to a veterinarian-client-patient relationship that meets the requirements of Section 2032.1 of Title 16 of the California Code of Regulations.