After the highs that the likes of Jubilee, Project: Lazarus, and Arrangements For War, Medicinal Purposes falls flat on its face with an offensively bad story. Featuring David Tennant portraying a severely mentally handicapped man with a stereotypical accent and a complete character assassination of the Doctor, it's one of the few stories I just could not actually get through - it's that bad and is among the worst of BF's early catalog.