Oxycodone 40 mg is used to manage severe pain . When other pain medicines did not work well the doctors presubscribe this tablet Oxycodone 40 mg . If the pain can not be tolerated then take this tablet . It will start work within 20 to 30 minutes and work up to 12 hours . Generally it will be used in the time of surgery and injury and cancer . When the pain is severe at that time, take the tablet and release the pain within 30min and at least up to 12 hours . The common side effects are dizziness , weakness , dry mouth and risk is the overdose of 40 mg of Oxycodone .