Hydroxena 500 Hydroxyurea 500mg Capsule is used in the treatment of some kinds of cancer and to prevent painful episodes associated with sickle cell anemia. It may be also used to treat some other conditions. It is sometimes used with certain other medicines as part of combination chemotherapy. Hydroxyurea 500mg Capsule can be taken with or without food, but try to have it at the same time every day to get the most benefits. Your doctor will decide what dose is necessary and how often you need to take it. 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 hematological disorders, gastrointestinal symptoms, eating disorders, and weight loss. This medicine may 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. Before taking it, tell your doctor if you have bleeding, liver, or kidney problems or are taking any medicines to treat infections. Many other medicines can affect, or be affected by, this medicine so let your doctor know all medications you are using. This medicine is not recommended during pregnancy or while breastfeeding. The use of effective contraception by both males and females during treatment is important to avoid pregnancy.