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SummaryJapanese pharmaceutical market, world's 2 nd largest in size, is traditionally renowned for its brands' domination and weakest generics share among major established economies. An in depth observation of published evidence in Japanese/English language provided closer insight into current trends in Japanese domestic legislation and pharmaceutical market development. Recent governmental interventions have resulted in significant expansion of generic medicines market size. Substantial savings due to generic substitution of brand name drugs have already been achieved and are likely to increase in future. Nationwide population aging threatening sustainable health care funding is contributing to the relevance of generic policy success. Serious long-term challenge to the modest Japanese generic manufacturing capacities will be posed by foreign pharmaceutical industries particularly the ones based in emerging BRIC economies.