Federal Register Final rule: FDA withdraws approval and amends the animal drug regulations to reflect the withdrawal of an NADA and three ANADAs at the sponsors’ request because the products are no longer manufactured or marketed. The products are: Springfield Milling Corp.’s Vigorena Feeds Hy-Ty Premix (tylosin phosphate) and Modern Veterinary Therapeutics’ Respiram (doxapram HCl injection), Butorphine (butorphanol tartrate) injection, and Vetazine (triamcinolone cream). To view this final rule, click here.