The Prison Service does not routinely collect the information requested. However, it is estimated that naltrexone, an abstinence-based treatment, is currently available in around 50 establishments for men and one for women. Methadone maintenance is available in the majority of establishments for women but is not yet widely used in men's prisons.
Subutex (buprenorphine) is included in the treatment protocols developed in conjunction with NHS services at eight establishments for men. Every establishment for women has the capacity to prescribe subutex but few do so at present because methadone is considered to meet most prisoners' needs. Subutex would, however, be made available to any woman already being prescribed it when received into custody.