Nitrol 20mg Injection is used in the treatment of certain kinds of breast and blood cancers. It is usually given alone or in together with certain other medicines as part of combination chemotherapy. It prevents cancer cells from growing, as a result of which they eventually die. Nitrol 20mg Injection is given as an injection into vein under the supervision of a doctor and should not be self-administered. This will depend on what you are being treated for and may change from time to time. You should take it exactly as your doctor has advised. Taking it in the wrong way or taking too much can cause very serious side effects. It may take several weeks or months for you to see or feel the benefits but do not stop taking it unless your doctor tells you to. The most common side effects of this medicine include anemia (low number of red blood cells), decreased white blood cell count, increased bleeding tendency, infection, nausea, and vomiting. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. Inform your doctor if you have a medical history, of bleeding disorders, heart or liver disease, radiation treatment or any infection. Inform your doctor immediately if you notice unusual bruising or bleeding or if you have dark, tarry, or bloody stools. This medicine is known to reduce the number of blood cells in your blood thereby, increasing the susceptibility to infections. Regular blood tests are required to check your blood cells along with kidney, liver and heart function during treatment with this medicine. Use of effective contraception by both males and females during treatment is important to avoid pregnancy.