Aerosporin is part of the Polypeptide Antibiotics class and treats Meningitis, Eye Infection, Bacterial Infection and other conditions. Polypeptide antibiotics are used to treat bacterial infections and eye infections. They work by killing or preventing the growth of the bacteria causing the infection. Aerosporin is only available as a brand name drug. Get Polymyxin B for as low as $18.28, save up to 80% off the average retail price for the most common version, by using a GoodRx coupon.