Bactracillin G Benzathine is available as an aqueous suspension in 100-mL, 250-mL and 500-mL multiple-dose vials. This product is for subcutaneous use in beef cattle only, and is indicated to aid in the treatment of bacterial pneumonia, upper respiratory infections and blackleg. This antibiotic shows a marked bactericidal effect against certain organisms during their growth phase. It is worth noting that Bactracillin G Benzathine is a substance of low toxicity. However, side effects, or so-called allergic or anaphylactic reactions - sometimes fatal, have been known to occur in animals hypersensitive to penicillin and procaine. Besides, such reactions can occur unpredictably with varying intensity. Therefore, animals administered Bactracillin G Benzathine should be kept under close observation for at least one-half hour. Should allergic or anaphylactic reactions occur, discontinue use of the product and immediately administer epinephrine following the manufacturer’s recommendations and call a veterinarian.