Ceftiofur
Ceftiofur is an antibiotic of the cephalosporin type, licensed for use in veterinary medicine. It was first described in 1987. It is marketed by pharmaceutical company Zoetis as Excenel, Naxcel, and Excede and is also the active ingredient in that company's Spectramast LC and Spectramast DC product.
It is resistant to the antibiotic resistance enzyme beta-lactamase, and has activity against both Gram-positive and Gram-negative bacteria. E. coli strains resistant to ceftiofur have been reported.
The metabolite desfurolyceftiofur also has antibiotic activity. The two compounds are measured together to measure for antibiotic activity in milk.
