Oxycontin is a tertiary analgesic, which is the most effective analgesic in the middle of the common three-step treatment for patients with advanced cancer pain. The chemical name of OxyContin is oxycodone hydrochloride extended-release tablets, and currently there are two specifications in China, one is 10mg, and the other is 40mg. For some patients who have just produced pain and affect sleeping, choosing 10mg is fine. But for serious pain patients, 10mg treatment effect is not good, or take several times a day, several tablets are not good, you can choose 40mg. must know the drug conversion, so that effective pain control without side effects. Because these drugs belong to the morphine class of drugs, generally and morphine have a strict conversion, for example, the common Oxycontin 10mg, is equivalent to morphine 15-20mg. so if the patient is currently taking morphine, want to change to Oxycontin, you can refer to the above amount of conversion method for conversion, so that you can avoid the bad effect caused by taking a small amount of drugs, or nausea caused by overdose, vomiting, drowsiness and constipation.