Nitroy 100mg Tablet is an antibiotic that fights bacteria. It is used to both prevent and treat bacterial infections in the urinary system. The Nitroy 100mg Tablet functions by stopping the growth of bacteria that cause urinary tract infections in the urine. This drug usually makes you feel better very quickly. To make sure that all bacteria are eradicated and do not become resistant, you should continue taking it as prescribed even after you feel better.