Straddling the line between advocacy documentary and D.I.Y. infomercial, “Dosed” promotes psychoactive vegetation as a potential cure for drug addiction. The filmmaker, Tyler Chandler, trails a friend, known in the film only by a first name, Adrianne, as she experiments with psilocybin mushrooms and the hallucinogenic plant iboga to treat her seemingly intractable dependence on heroin, methadone or morphine. The effectiveness of these alternative-medicine therapies, and the question of whether they should be legal, is still the subject of debate.

Adrianne, who lives in Vancouver, British Columbia, has a third, potentially powerful ingredient contributing to her recovery: the presence of the camera, which, at times, is clearly on her mind. As the documentary opens, Adrianne is asked how she would like it to end. “I’d love to be sober,” she replies, but adds that she’d like to be sober, generally. And although her treatment does not follow a straightforward path — her initial efforts at a supervised iboga retreat are disrupted by a hospital trip for a panic attack — she eventually achieves the sobriety she foreshadows.