Megaclox Capsules are used to treat a variety of bacterial illnesses. Megaclox Capsule is a mixture of Ampicillin and Cloxacillin. These antibiotics impede the production of the bacterial protective layer, which is required for bacterial survival. They work together to successfully treat your infection. This medication normally makes you feel better within a few days, but you should keep taking it as prescribed even after you feel better to ensure that all germs are eliminated and do not grow resistant.