Following the slump, the market capitalisation of the company eroded by Rs 1,515 crore to Rs 56,069.03 crore.
At close, the stock was quoted at Rs 3,286.80, down by Rs 88.75 or 2.63 per cent on the BSE. The broader BSE Sensex, however, soared 359.40 points, or 1.41 per cent, at 25,841.92.
On the National Stock Exchange, the stock ended at Rs 3,281.10, down 2.54 per cent.
On the volume front, over 4.77 lakh shares were traded on the BSE and 38.06 lakh shares exchanged hands on the NSE.
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US-based law firm Lundin Law, which specialises in securities litigations is investigating claims against Dr Reddy's Laboratories for possible violations of federal security laws, which the drug maker has denied.
"The investigation is related to allegations that certain statements issued by Dr Reddy's were false and misleading concerning the company's financial performance," Los Angeles-based Lundin Law said in a statement.
The company has no further comment on what might be "advertorial press release by law firms and refute all allegations", it added.