Polycillin is a brand name for ampicillin, a type of antibiotic medication used to treat bacterial infections. However, there are many alternative names for this medication. Some common synonyms for Polycillin include Ampen, Omnipen, Principen, Totacillin, and Marcillin. These medications are also part of the penicillin family and work by preventing bacteria from forming their protective cell wall. Like Polycillin, these medications can be used to treat a variety of infections, including ear infections, respiratory infections, urinary tract infections, and skin infections. It is important to consult with a healthcare professional before starting any antibiotics to ensure proper treatment and avoid potential side effects.