File Entry: SILDENAFIL CITRATE (Viagra) IN ITS POLYMORPHIC FORMS

Created: 2013-04-08 05:17:04
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Version created on: 2013-04-08 05:17:04


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AN IMPROVED PROCESS FOR THE PREPARATION OF SILDENAFIL CITRATE (Viagra) IN ITS POLYMORPHIC FORM

The present invention provides an improved process for preparation of 1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H –pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulphonyl]-4methypiperazine citrate (Sildenafil Citrate) of

Polymorphic form I)


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