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THE VIEWS EXPRESSED ARE MY PERSONAL AND IN NO-WAY SUGGEST THE VIEWS OF THE PROFESSIONAL BODY OR THE COMPANY THAT I REPRESENT, [email protected], 91 9323115463 India The present Invention relates to an improved process for preparation of tadalafil and crystallization and/or purification thereof, wherein the processes are conducted at increased pressure. The invention relates also to a process for preparation of tadalafil co-precipitates and to a solid pharmaceutical composition comprising tadalafil co-precipitates and at least one water soluble diluent and/or water insoluble non-swellable diluent, wherein the composition is substantially free of water insoluble swellable diluents The present invention relates to a process for the preparation of CGMP-phosphodiesterase inhibitor, particularly tadalafil, a method for production co-precipitate thereof and to solid oral pharmaceutical formulations comprising tadalafil co-precipitate. 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