Long-Lasting Penicillin G treats bacterial pneumonia and upper respiratory infections. Acts on susceptible bacteria within 15 minutes and keeps working for 48 hours. Two-dose regimen means less handling and less stress on animals. Given by subcutaneous injection. Active ingredients: Penicillin G Benzathine, Penicillin G Procaine. Total 300,000 units per ml. Indicated for use in cattle only. Label may be different than shown.