Extending its last session's losses, the scrip further slumped 5.96 per cent to Rs 2,465 on BSE.
At NSE, shares of the company tumbled 6.45 per cent to Rs 2,451.10.
The stock had fallen by over 3 per cent in the previous trading session also.
Dr Reddy's Laboratories yesterday reported 56.61 per cent dip in consolidated net profit to Rs 66.6 crore for the quarter ended June, mainly on account of lower revenues from the US and impact of GST in India.
Consolidated net sales of the company stood at Rs 3,248.9 crore for the quarter under consideration. It stood at Rs 3,185.7 crore for the corresponding period a year ago.