500 mg of Cefrotux An antibiotic medication called a capsule is used to treat bacterial infections in the body. 500 mg of Cefrotux A capsule is a multipurpose antibiotic medication that eliminates the bacteria that causes infections in your body. Numerous infections, including those of the lungs (pneumonia), ears, abdomen, urinary tract, bones, joints, skin, and soft tissues, can be treated with this medication. You should continue taking this medication as directed even after you feel better, even though it normally takes a few days. If you stop it too soon, the illness can return and become more difficult to cure.