Procaine Penicillin G + Streptomycin Sulfate Injection 1.5MIU+0.5MIUPenicillin G Procaine is used to treat bacterial infections in horses, cats, dogs, and livestock animals such as camels, goats, sheep, cows and pigs. Indicated for respiratory infections, mastitis in swine, and otitis externa. Can also help in treating foot infections.