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.
DRL stock plunged nearly 15 per cent on the BSE.
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.
This action follows the earlier inspections of these sites by the agency in November 2014, January 2015 and February 2015 respectively, it added.
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In November last year, DRL said, USFDA had made as many as nine procedural deviations at Srikakulam plant.
According to USFDA website, during an inspection, FDA's Office of Regulatory Affairs investigators may observe conditions they deem to be objectionable.
Sarabjit Kour Nangra, vice president research - pharma, Angel Broking, said the impact of the Active Pharmaceutial Ingredients (API) facilities would depend upon how quick the company fixes the USFDA issues, plant transfers or does third party sourcing, but the near term performance of the company will be impacted.
Prasad said they will respond with a comprehensive plan to address these observations within the stipulated time-frame of 15 days even as they take quality and compliance matters seriously and stand by the commitment to fully comply with the CGMP (Current Good Manufacturing Practice) quality standards across all of the company's facilities.