This medicine contains 2 antibiotics called flucloxacillin and ampicillin.this combination of flucloxacillin and ampicillin is also known as co-fluampicil. this medicine belongs to a group of antibiotics called the penicillins.co-fluampicil is used to treat certain bacterial infections of the ear, nose, throat, lungs, skin or bladder.interaction:do not take antacids together with co-fluampicil. antacids could reduce the effectiveness of co-fluampicil. if you must take antacids, take them at least 1 hour before or 2 hours after co-fluampicil.inform your doctor if you are taking birth-control pills that contain oestrogen. co-fluampicil may decrease the effectiveness of these pills. you may wish to discuss additional birth-control methods with your doctor or pharmacist.