Ampicillin (Corpilyn) 500mg Powder for Injection, IM/IV, Vial 1's is a broad-spectrum penicillin-type antibiotic used to treat bacterial infections such as respiratory tract infections, urinary tract infections, gastrointestinal infections, and septicemia. It works by inhibiting bacterial cell wall synthesis, leading to bacterial cell death. Administered via intramuscular (IM) or intravenous (IV) injection as directed by a healthcare professional.