Pfizerpen Injection (Penicillin G Potassium USP) 20,000,000 Units Per Powder Vial (Rx)Pfizerpen Injection (Penicillin G Potassium USP) 20,000,000 Units is an antibiotic used to treat a variety of serious bacterial infections. It is effective against infections such as pneumonia, sepsis, meningitis, and syphilis. By inhibiting the synthesis of bacterial cell walls, it combats both gram positive and some gram negative bacteria. Administered intravenously or intramuscularly, it is crucial in hospital settings for managing severe