Buprenorphine misuse among heroin and amphetamine users in Malmo, Sweden: purpose of misuse and route of administration.

Buprenorphine misuse by injecting drug users was assessed in a survey of 350 needle exchangers, either amphetamine (57%) or heroin users (42%). 89% of heroin users and 24% of amphetamine users reported using buprenorphine at some time during the previous year. Most users reported illicit acquisition. Among illicit users, 87% of heroin users reported intake for withdrawal treatment or self-detoxification, and 11% for euphoria. Euphoria seeking was more common among amphetamine users (62%, p < 0.001). Intravenous misuse was reported by 43% of illicit users, and snorting by 29%. Sole sublingual intake was more common among heroin users than among amphetamine users (46 vs. 20%, p < 0.05), and less common among patients reporting euphoria seeking (20 vs. 46%, p < 0.05).