by Dr. Michelle Arnold On June 11th, 2021, The Food and Drug Administration (FDA) finalized a Guidance for Industry (GFI) #263, which outlines the process for animal drug manufacturers to change all remaining antibiotic formulations used in animal health care from over-the-counter (OTC) to prescription status. Products commonly used by producers such as injectable penicillin and oxytetracycline (for example, LA-300) will no longer be available without a prescription from a ve