ROLE OF FARAD: According to AMDUCA, veterinarians who treat food animals with drugs in an extralabel manner must use evidence "...derived from food safety data or other scientific information..." in order to determine an appropriate withdrawal interval (WDI) that allows for a conservative estimate of drug residue level in edible animal tissues. Based on published scientific reports and population-based pharmacokinetic modeling, FARAD has developed a WDI Lookup Tool that provides recommended WDI values for a limited number of approved food animal drugs used in an extralabel manner.

IMPORTANT NOTE: The withdrawal interval (WDI) is a scientifically-derived recommended withholding time for a drug following its extralabel use in a food animal. The WDI is distinct from the official withdrawal time (WDT) for a drug. WDTs are established by the FDA for all approved (labeled) uses of food animal drugs and can be located in VetGRAM or at the FDA Center for Veterinary Medicine.

Link to FARAD's WDI Recommendations to use the withdrawal interval (WDI) Lookup Tool developed by FARAD.
Link to AVMA's ELDU algorithm to use the ELDU Algorithm developed by the AVMA.
Link to FARAD's Online Submission form to submit an ELDU-related question or to contact FARAD experts about chemical contamination in food animals.