CDER Exclusivity Board: Can 3-Year Exclusivity Applied to a Prodrug Block 505(b)(2) NDA Approval for the Active Metabolite?

By Kurt R. Karst — This is the second post in a series of posts dedicated to delving into and discussing various issues that arise with both 5-year New Chemical Entity (“NCE”) exclusivity and 3-year new clinical investigation exclusivity based on a small stack of Letter Decisions we obtained that were issued by the Exclusivity Board in the Center for Drug Evaluation and Research – the “CDER Exclusivity Board.” While our first post dealt with 5-year NCE exclusivity, this post (and the remainder of our posts in this series) will deal with 3-year new clinical investigation exclusivity. First up is a relatively short, but nevertheless informative decision on the scope of two periods of 3-year exclusivity FDA granted in connection with the April 23, 2015 approval of Supplemental NDAs (“sNDAs”) for VALCYTE (valganciclovir HCl): one sNDA for VALCYTE Tablets (NDA 021304/S-011) and another for VALCYTE Oral Solution (NDA 022257/S-005). Both…

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