The FDA has been working with other government agencies for many years to address the emerging public health issue of antimicrobial resistance. Antimicrobial resistance is driven by many factors and it’s difficult to determine the root cause of any given case of resistance. FDA is currently working with drug manufacturers to phase out the use of medically-important antimicrobials for food-production purposes and phase in the oversight of a veterinarian for the remaining therapeutic uses of such drugs. Once this is complete, it will be illegal to use these antibiotics for growth promotion purposes.
For additional information please see FDA’s webpages on the judicious use of antimicrobials: