Fentanyl is a synthetic opioid pain reliever, 50-100 times more potent than morphine. Legally, it  is prescribed in the form of transdermal or lozenges under the name of Actiq, Duragesic, or  Sublimaze. When illegally produced, it may take the form of powder, eye droppers, pill form or  nasal sprays. Other drugs such as cocaine and marijuana may be unknowingly laced with  Fentanyl. Street names for illegal fentanyl include Apache, China Girl, China White, Friend,  Jackpot, Tango & Cash.  

See: Substances