Overview of Ampicillin for Dogs and Cats; Ampicillin, also known as Polyflex®, is an antibiotic related to penicillin used in dogs and cats to treat and prevent bacterial infections. Ampicillin is an antibiotic used to prevent and treat infections found in cuts and wounds, the mouth, the upper respiratory system, and the bladder for cats and dogs. Come to petMD for a complete list of pet medications and prescriptions. Ampicillin for injection, USP is indicated in the treatment of infections caused by susceptible strains of the designated organisms in the following conditions: Respiratory tract Infections caused by S. pneumoniae (formerly D. pneumoniae). Ampicillin for injectable suspension, veterinary is a broad-spectrum penicillin which has bactericidal activity against a wide range of common gram-positive and gram-negative bacteria. Each 25 g vial contains: 25 g ampicillin activity as ampicillin trihydrate, 90 mg methylparaben (as preservative), 10 mg propylparaben (as preservative), 200 mg lecithin, 500 mg povidone, 200 mg sodium chloride. Ampicillin is an antibiotic used to prevent and treat a number of bacterial infections, such as respiratory tract infections, urinary tract infections, meningitis, salmonellosis, and endocarditis. It may also be used to prevent group B streptococcal infection in newborns. [2] Ampicillin and Sulbactam for Injection, USP is an injectable antibacterial combination consisting of the semisynthetic antibacterial ampicillin sodium and the beta-lactamase inhibitor sulbactam sodium for intravenous and intramuscular administration. Ampicillin injection is used to treat certain infections that are caused by bacteria such as meningitis (infection of the membranes that surround the brain and spinal cord) and lung, blood, heart, urinary tract, and gastrointestinal tract infections. How to use Ampicillin Sodium Vial. This medication is given by injection into a vein (intravenously-IV) or into a muscle (intramuscularly-IM) by a healthcare professional as directed by your doctor.