General prevalence. Includes opiates and prescription opioids. Opioids include heroin; opium; pharmaceutical opioids such as buprenorphine (e.g. Suboxone, Subutex), codeine, dextropropoxyphene, fentanyl, oxycodone (e.Oxycontin) hydrocodone (e.g. Vicodin), hydromorphone, methadone, morphine and pethidine; and other illicit opioids (e.g. “homebake”, AH-7921).
Source: UNODC