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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. Tadalafil, chemically known as (6R-trans)-6-(1,3-benzodioxol-5-il)-2,3,6,7,12,12a-hexahydro-2-methyl-pyrazino.1′, 2′:1,6]pyrido[3,4-b]indole-1,4-dione, is a potent and selective inhibitor of the cyclic guanosine monophosphate (c GMP) – specific phosphodiesterase enzyme PDE5. It is shown below as structural formula I: Tadalafil is marketed under the tradename CIALIS* and is used for the treatment of erectile dysfunction. The product is available as a film-coated tablet for oral administration containing 2.5, 5, 10 and 20 mg of active ingredient and the following inactive ingredients: lactose monohydrate, hydroxypropylcellulose, sodium lauryl sulfate, croscarmellose sodium, microcrystaliine cellulose, magnesium stearate, hypromellose, triacetin, titanium dioxide (E171), iron oxide (E172) and talc. Problems associated with low solubility of tadalafil in ethanol and most of other organic solvents resulted in the need of large quantities of solvents required to perform synthesis and crystallization of tadalafil at industrial scale, which have unwanted technological, environmental and economical impact. 5 859 006 describes the synthesis of the tadalafil and its intermediate (A) which involves reacting D-tryptophan methyl ester with a piperonal in the presence of dichloromethane and trifluoroacetic acid which provides a mixture of desired cis and undesired trans isomer of intermediate A with poor selectivity. Tadalafil (Cialis) is created and marketed by the Eli Lilly business. This medicine is used to deal with male impotence, or erectile disorder. In many cases guys being managed for impotence are recommended the 10 mg dosage that must be taken when required. 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