Fentanyl transdermal patch, the use of people with advanced cancer may appear drowsiness, hypotension, respiratory depression and other side effects. Fentanyl transdermal patch is an opioid agonist, a potent narcotic analgesic; the use of fentanyl transdermal patch in advanced stages of cancer may result in adverse reactions such as nausea, vomiting, blurred vision, itching and euphoria, drowsiness, confusion, hypotension, and even respiratory depression and other side effects in severe cases. Fentanyl transdermal patch should be used from a small dose; patch is contraindicated in acute or postoperative pain, non-opioid analgesics effective; caution in intracranial tumors, traumatic brain injury, hepatic and renal insufficiency, children or patients under 18 years of age weighing less than 50kg. The use of fentanyl transdermal patch, you need to follow the doctor’s instructions under the guidance of a physician to use reasonably, avoid blindly use the drug on their own to avoid adverse situations.