Medics and charities working in Donetsk say dwindling supplies of methadone means addicts are not getting adequate help to rehabilitate.
Not only is drug use on the rise in rebel-controlled Eastern Ukraine, but an upsurge in the sharing of needles has led to an increase in HIV infections.
An estimated 238,000 people aged 15-49 are infected, making Ukraine the worst affected country by HIV/AIDS in Europe.
Al Jazeera's John Hendren reports from Donetsk.
Source: Al Jazeera