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infobox references zaprinast was an unsuccessful clinical drug candidate that was a precursor to the chemically related pde inhibitors , such as sildenafil (viagra), which successfully reached the market. it is a phosphodiesterase inhibitor , [ ] selective for the subtypes pde , pde , pde and pde . ic
infobox references zaprinast was an unsuccessful clinical drug candidate that was a precursor to the chemically related pde inhibitors , such as sildenafil (viagra), which successfully reached the market. it is a phosphodiesterase inhibitor , [ ] selective for the subtypes pde , pde , pde and pde . ic...
https://en.wikipedia.org/wiki/Zaprinast