Fentanyl is a manmade, copycat drug. It copies heroin and produces very similar effects—such as euphoria, sleeplessness, relaxation and the masking of pain. It also causes constipation and confusion. What addicts may forget when using it is that it is lethal in extremely small doses.
Authorities in the Uk have been discovering heroin mixed with Fentanyl and it is now cropping up in more areas.
Heroin is an all too powerful drug by itself. Drug dealers when dealing with new clients will usually sell pure and powerful heroin until they have a new client, a fully hooked addict.