The stock slipped 5.13 per cent to Rs 3,324.70 on BSE.
At NSE, shares of the company dropped by 5 per cent to Rs 3,323.50.
The stock has fallen by over 20 per cent in three days.
Dr Reddy's Laboratories had yesterday said the US Food and Drug Administration has directed it to get a third party assessment of its three manufacturing plants for which it received warning letter last week.
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"We have instituted corrective actions to assess the 483 observations received earlier for these sites. The recent letter underscores the need for us to reevaluate the work done in the light of the observations (made by the FDA) and continue to implement the process ...
"The FDA wants us to focus on the issue (on the warning letter) and also get the third party verification and third party evaluation for certain things and also do it across our manufacturing network," Prasad said in conference call.