Fentanyl patches (really should check the spelling on that) are prescribed to him for chronic pain.
They are applied to the skin, and worn just like a nicotine patch. They produce a steady, time-released narcotic pain medication, so that you are generally "on top" of the pain, rather than "chasing pain".
Aaaaah, but they don't make you high. Unless of course, you cut them into thin strips and chew them, or light them on fire and inhale the smoke for a very brief, very intense high.
The doctors up here are moving everyone off of the patches, except for terminal cancer patients, because people are dropping like flies from unintentional overdose.
More than I ever wanted to know.
ETA:
http://www.cbc.ca/m/news/canada/ott...ins-lure-and-risk-of-fentanyl-abuse-1.2254700