Categorising methadone: Addiction and analgesia.

While methadone was first developed as an analgesic, and used for this purpose before it was adopted as a therapy for drug dependence, it is this latter use which has saturated its identity. Most of the literature and commentary on methadone discusses it in the context of methadone maintenance therapy (MMT). But one of the effects of the liberalization of opiate prescription for chronic pain which took place in the 1990s was the re-emergence of methadone as a painkiller. This article examines the relationship between methadone the painkiller and methadone the addiction treatment as it is constituted in recent medical research literature and treatment guidelines. It highlights the way medical discourse separates methadone into two substances with different effects depending on the problem that is being treated. Central to this separation is the classification of patients into addicts and non-addicts; and pain sufferers and non-pain sufferers. The article argues that despite this work of making and maintaining distinctions, the similarities in the way methadone is used and acts in these different medical contexts complicates these categories. The difficulties of keeping the 'two methadones' separate becomes most apparent in cases of MMT patients also being treated for chronic pain.