What about the combination of fentanyl and heroin? Is it safe, dangerous, common?
I'm not sure what this is. It's for pain.
Fentanyl is one of the most powerful and carefully prescribed painkillers available today. Casual inquiries about this medication commonly suggests mis-use.
Carfentanil or carfentanyl, said to be more powerful than fentanyl or morphene, opium, heroin.