ZELgor 500mg Tablet is used in the treatment of cancer of the prostate gland. It may also be used to treat other conditions, as determined by the doctor. It is sometimes used with certain other medicines as part of combination chemotherapy. ZELgor 500mg Tablet should be taken on an empty stomach, either one hour before or at least two hours after a meal. Taking it with food may increase the blood levels of ZELgor 500mg Tablet, which 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.The most common side effects of ZELgor 500mg Tablet include vomiting, decreased potassium level in blood, edema (swelling), decreased white blood cell count, and fatigue. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. Other than this, the yellowing of the skin, loss of appetite, shortness of breath, dark urine, and nausea can happen, which indicate some liver problems. Your doctor might check you for liver function, blood pressure, and the level of potassium in your blood.Before taking ZELgor 500mg Tablet, tell your doctor if you have high blood pressure, heart problems, liver or kidney problems, or are taking any medicines to treat infections. Many other medicines can affect, or be affected by, this medication, so let your doctor know about all medications you are using. This medicine is not recommended during pregnancy or while breastfeeding. It may harm your baby. The use of effective contraception by both males and females during treatment is important to avoid pregnancy. You may be asked to undergo regular monitoring of your blood glucose level while on treatment.