The Food and Drug Administration (FDA) is seeking comments by June 28 in its review of veterinary feed directive (VFD) regulations.

In its March 29 Federal Register notice, FDA indicates that complaints have been made that the directive process is burdensome. Other concerns have been expressed that the process will become problematic to administer as the number of approved VFD animal drugs increases.

Veterinary feed directive drugs are those that can be used in animal feed but only with a licensed veterinarian’s supervision and a valid veterinarian-client-patient relationship.

Under this process, a veterinarian who determines use of animal feed containing a VFD is indicated, must fill out and sign an approved form with information about himself/herself, the client, the animal (s) to be treated and the drug to be used. All parties are required to keep copies of the form for at least two years.

The FDA has approved use of two antimicrobials as VFD drugs. Tilmicosin has been approved as a VFD drug for swine and florfenicol is approved for use in swine, catfish and salmonids. Extra-label use of any medicated feed is prohibited.

Comments are due by June 28. To send comments online, go to and search for docket number FDA-2010-N-0155. Fax comments to (301) 827-6870 or mail to the Division of Dockets Management (HFA-305), Food and Drug Administration, 5630 Fishers Lane, Rm. 1061, Rockville, MD 20852.