The main use of this medication is in operating suites and critical care where pain relief is required for a short period of time. It also offers properties of sedation and this makes it a good analgesic component of anaesthetic regimen during an operation.^[2] It is usually administered under the doctor's order through an intravenous route. In some countries sufentanil is only indicated for epidural use. Despite this, it is often used off-label both intravenously and intranasally. A transdermal sufentanil patch called Transdur-sufentanil is about to enter Stage III clinical trials by Durect Corp for the relief of chronic pain, and has the advantage over fentanyl patches such as Duragesic of only needing to be applied once per week.