SHEEP CEFTIOFUR (IV) Resources Craigmill, A. L., Brown, S. A., Wetzlich, S. E., Gustafson, C. R., & Arndt, T. S. (1997). Pharmacokinetics of ceftiofur and metabolites after single intravenous and intramuscular administration and multiple intramuscular administrations of ceftiofur sodium to sheep. Journal of Veterinary Pharmacology and Therapeutics, 20(2), 139–144.