Figure 12.1 shows the market data for nomifensine in the United Kingdom. Unit sales are shown in terms of defined daily doses of 100 mg. This terminology was not routinely used in 1979/1980 and was only adopted by the World Health Organisation (WHO) in January 1992 as an international standard denominator for calculating incidence. The numbers of prescription were provided by the Committee on Safety of Medicines (CSM) from the Prescription Pricing Authority,
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