Ampicillin Sodium (Liferzin) 250mg Powder for Injection, IV/IM, Vials 10's is a broad-spectrum penicillin-type antibiotic used to treat various bacterial infections, including respiratory tract infections, urinary tract infections, gastrointestinal infections, and septicemia. It works by inhibiting bacterial cell wall synthesis, which leads to bacterial cell death. Administered via intravenous (IV) or intramuscular (IM) injection as directed by a healthcare professional.