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This guidance is intended to assist sponsors in the codevelopment of two or more novel (not previously marketed) drugs to be used in combination to treat a disease or condition.  The guidance provides recommendations and advice on how to address certain scientific and regulatory issues that will arise during codevelopment.  It is not intended to apply to development of fixed-dose combinations of already marketed drugs or to development of a single new investigational drug to be used in combination with an approved drug or drugs.  The guidance is also not intended to apply to vaccines, gene or cellular therapies, blood products, or medical devices.