PoLune B 500000IU Injection is an antibiotic that works by killing bacteria which can cause serious infections. It is a versatile medicine used to treat many different types of bacterial infections. This medicine is usually given as an injection by a doctor or nurse and should not be self-administered at home. This medicine usually makes you feel better very quickly but you should continue taking it as prescribed even when you feel better to make sure that all bacteria are killed and do not become resistant.