You can Buy Oxycodone Online in tablet and liquid form. This medicine is also accessible as the extended and immediate form. The immediate form of the medication will begin to work within an hour, depending on the user's metabolism and the severity of the medical condition. The effects of the immediate release form will fade away in 6 hours. It is why you should take this medicine in the gapping of 6 hours. The extended-release form of the medication takes longer to work as it may take about a day or two, but the pain relief will last for a long time.