Oncophos 200mg Injection is used in the treatment of different kinds of cancers. It is also used to treat kidney disease known as nephrotic syndrome in children after other treatments have not worked. It may be also used to treat other conditions, as determined by the doctor. Oncophos 200mg Injection is given as an injection into a vein by the healthcare professional, but better if injected at the same time every day. 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.