Final answer:
Fentanyl is used in medicine to treat severe pain.
Step-by-step explanation:
The medical use of fentanyl is to treat severe pain. Fentanyl is a potent opioid medication that is often used in medical settings, such as in anesthesia and for pain management. It works by binding to opioid receptors in the brain and spinal cord, reducing the perception of pain.
Learn more about medical use of fentanyl