Legally-prescribed fentanyl is available as a transdermal patch, lozenge, nasal spray, or in injectable form. It is a fast-acting drug that delivers painkilling effects in just a few minutes, and the effects of a dosage will wear off in one-to-two hours. In addition to killing pain it produces deep relaxation and euphoria, which has made it popular with recreational drug users.
On the illicit drug market, fentanyl and its analogues are sold as powders, tablets, or on blotted paper, and can be smoked, snorted, injected, or taken orally. Fentanyl in its illegal forms is often far more powerful than legally-prescribed versions, and it is often mixed with heroin or cocaine for an added euphoric effect.
While misuse of prescribed fentanyl is a problem, and often the source for the onset of fentanyl dependency, it is the illicit forms of the drug that are primarily responsible for drug overdose fatalities.
When taken recreationally or compulsively as a result of addiction, the risk of fentanyl overdose rises dramatically.