Sulster is part of the Sulfa Antibiotic / Corticosteroid Combinations class and treats Eye Infection and Eye Inflammation. Sulfa antibiotic / corticosteroid combinations are used to treat eye infections and eye inflammation. They work by killing the bacteria causing the infection and by reducing swelling. Sulster is only available as a brand name drug. Get Sulfacetamide/Prednisolone Sodium Phosphate for as low as $11.29, which is 51% off the average retail price of $23.13 for the most common version, by using a GoodRx coupon.