This product is effective against udder infection caused by the following susceptible microorganisms: Streptococcus agalactiae, Streptococcus dysgalactiae and Streptococcus uberis. For the best results, it should be used promptly at the first signs of mastitis. For udder instillation in lactating cattle only. Each 10-mL single-dose syringe contains 100,000 units of penicillin G procaine, sesame oil 8.7g, calcium carbonate 0.089g, corn starch 0.089g, hydrogenated castor oil 0.044g.