An updated veterinary feed directive rule will require veterinarians to issue a prescription, not a VFD, for all medically important antibiotics administered in water.

Antibiotics that aren’t water-soluble might also be affected, if the antibiotic is on the Food and Drug Administration’s list of medically important antibiotics.

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CORRECTION: A previous version of this article stated that water-administered antibiotics would require a VFD. They will require a prescription, not a VFD.