Cepebiotic IS (neomycin sulfate & lincomycin hydrochloride) is used to treat mastitis. It is a common and effective way to treat both clinical (visible symptoms like swollen or hot udders) and subclinical (no visible symptoms but detected through other tests) mastitis in dairy cows. Effective against Streptococcus dysgalactiae, Escherichia coli, and Staph aureus.