The stock took severe beating and tumbled 14.65 per cent to settle at Rs 3,629.55 on BSE. During the day, it plunged 14.99 per cent to Rs 3,615.
At NSE, shares of the company dived 14.56 per cent to settle at Rs 3,630.65.
The company's market valuation dipped by Rs 10,628.05 crore to Rs 61,915.95 crore.
On the volume front, 3.79 lakh shares of the company changed hands at BSE and over 40 lakh shares were traded at NSE during the day.
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Dr Reddy's CEO G V Prasad said the company will respond with a comprehensive plan to address the observations by the US Food and Drug Administration (USFDA).
The company hopes for a re-audit of the three plants by USFDA once the observations made by it are rectified or fulfilled, said DRL President, CFO and Global Head of HR, Saumen Chakraborty.
DRL said in a regulatory filing that it "has received a warning letter issued by the US FDA dated November 5, 2015 relating to its API manufacturing facilities at Srikakulam in Andhra Pradesh and Miryalaguda in Telangana, as well as Oncology formulation manufacturing facility at Duvvada, Visakhapatnam in Andhra Pradesh."
In the broader market, the benchmark BSE Sensex ended 38.96 points lower at 26,265.24.