FLUBIOTIC 500 mg capsules contain Flucloxacillin, a type of penicillin antibiotic. It is primarily used to treat infections caused by penicillin-sensitive bacteria, especially staphylococcal infections. Flucloxacillin is effective against skin and soft tissue infections, respiratory tract infections, bone infections, and urinary tract infections. It works by interfering with the bacterial cell wall synthesis, leading to the death of the bacteria.