I just looked this stuff up, never heard of it before.
Sounds like some nasty stuff if abused.
Fentanyl is a DEA-controlled Schedule II drug. That means manufacturers and, in my case, drug compounders who produce the drug and the compounded drug, have a lot to contend with. I've been dealing with these types of drugs for several years now in my job, and it makes for a lot of bureaucracy.