Xbira 250mg Tablet is used in the treatment of cancer of the prostate gland. It may be also used to treat other conditions, as determined by the doctor. It is sometimes used with certain other medicines as part of combination chemotherapy. Xbira 250mg Tablet should not be taken on an empty stomach. Taking it with food may cause side effects. 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.