Hi Nabendu,
Unforunately, no public source AFAIK. IMS Health tracks prescription/OTC sales and derives market share data (for a particular drug); information is behind paywall.
At times, IMS data may not portray full picture. e.g. snippet of Torrent Pharma Q2FY16 transcript
Source: http://www.torrentpharma.com/download/financials/gen_info/Transcript-Q2-FY-16.pdf
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