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Be Prepared: Transitioning Certain OTC Antimicrobial Products to Rx June 2023

FDA published Guidance for Industry (GFI) #263 in June 2021 which outlined a plan for transitioning certain over-the-counter (OTC) antimicrobial products for animals to prescription (Rx) status. As outlined in FDA's Guidance for Industry (GFI) #263, FDA expects approved animal drug products containing medically important antimicrobials that are currently available as OTC products to transition to Rx status beginning in June 2023. To help prepare for this transition, FDA Center for Veterinary Medicine (CVM) is conducting outreach to increase awareness about this expected change.

FDA CVM has developed written materials with information on products/indications that will be transitioning as part of GFI 263 and information on how interested animal owners can locate a vet. Also linked below are a brochure and poster which detail the importance of veterinary involvement as products transition to Rx.

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Measuring Emissions from Animal Agriculture Using Genetics!

Video: Measuring Emissions from Animal Agriculture Using Genetics!

Dr. Troy Rowan sits down with CLEAR Conversations host, Tracy Sellers. Dr. Rowan was a featured speaker at the 2025 State of the Science Summit at UC Davis. The event will return next year on June 16-18, 2026, continuing its focus on advancing livestock methane research and collaborative solutions.

Rowan, now an assistant professor at the University of Tennessee Institute of Agriculture, grew up surrounded by cattle on his family’s Charolais operation in Iowa. His family has been farming and ranching there for more than a century — long enough for the rhythms of agriculture to get in his blood.