Figure 1From: Influence of mandatory generic substitution on pharmaceutical sales patterns: a national study over five years Total sales volumes of non-substitutable and substitutable drugs in the included therapeutic groups. Volumes expressed as defined daily doses per 1000 inhabitants and day (DDD/1000 inhabitants and day). The two vertical reference lines indicate the implementation period for generic substitution (1 October 2002–30 September 2003).Back to article page