NITROFURANTOIN 100MG GENERIC is used to treat or prevent certain urinary tract infections.This medication is an antibiotic that works by stopping the growth of bacteria. It will not work for viral infections (such as common cold, flu). Unnecessary use or overuse of any antibiotic can lead to its decreased effectiveness.Nitrofurantoin should not be used by children less than one month of age due to the risk of a certain blood problem (hemolytic anemia).