(Zoetis Animal Health) Spectramast LC is indicated for the treatment of clinical mastitis in lactating dairy cattle associated with coagulase-negative staphylococci, Streptococcus dysgalactiae, and Escherichia coli. Each 10 ml tube of Spectramast LC contains the equivalent to 125 mg ceftiofur in a cottonseed oil base. Infuse one tube into each affected quarter. Repeat this treatment in 24 hours. For extended duration therapy, once daily treatment with Spectramast LC may be repeated for up to 8 consecutive days. Ceftiofur.