Love Potion (1987)

After her brother's death by overdose, Delaware delves into the world of drugs. Two years later she agrees with her father to submit herself to a drugs rehabilitation program in a special clinic in England. When she arrives for the treatment, with a small group of other drug addicts, she gets in touch with the doctors' unorthodox methods and soon realizes she's stuck in a place where morbid and strange experiences with drugs take place.