This Drug Could Make a Huge Dent in Heroin Addiction. So Why Isn't It Used More?

This drug could make a huge dent in heroin addiction. So why isn't it used more?
Over the past 35 years, about 200,000 injection-drug users have died of HIV/AIDS. Substitution therapies — first methadone, more recently, buprenorphine — provide an imperfect but essential tool to treat opiate disorders, and thus to ameliorate harms …
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