This article details the methods of misuse, effects and side effects and prescription issues relating to the morphine alternative, Diconal. From the summer of 1970 to December 1971 64 people (primarily males, with an average age of 21.4 years) presented for treatment for adverse effects from the use of Diconal. Adverse effects include infections, overdose, venous thromboses and abscesses. Initially Diconal abusers acquired the drug through burgling dispensaries, and later attended multiple doctors in order to receive a large number of prescriptions. Two doctors were charged with failing to comply with the Dangerous Drugs Act 1934. Few abusers were charged as they had acquired the drugs on prescription. In August 1971 the National Drugs Advisory Board wrote to GPs drawing their attention to the care required in prescribing Diconal, especially to young people. Following pressure and publicity the marketing of Diconal ceased as of November 30th, 1971.