Shares of Indoco Remedies slumped to near 3-year low on FDA concerns.
The stock fell as much 16.32 per cent to Rs 208.50, its lowest since July 30, 2014.
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FDA has accepted the company's response on four observations, but has raised concerns over the remaining two.
The observations relate to a specific product for which the company is a contract manufacturer.
Indoco stock posted biggest intraday percentage loss since June 12, 2015.