A single-arm, prospective, multicenter study on the efficacy and safety of low-dose transdermal fentanyl patch in opioid-naive patients with moderate to severe cancer pain.
Fentanyl
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: Identify all the mentioned drugs in the given text. Text may or may not contain drug. If they contain more than 1 drug, use ";" as delimiter and join them. ### Input: A single-arm, prospective, multicenter study on the efficacy and safety of low-dose transdermal fentanyl patch in opioid-naive patients with moderate to severe cancer pain. ### Output: Fentanyl