Despite making a positive opening, shares of Ranbaxy Lab failed to sustain the momentum and fell by 2.13 per cent to Rs 429 on the BSE.
On the NSE, the stock lost 2.31 per cent to Rs 428.65.
In the previous session, the stock plunged over 5 per cent.
The US Food and Drug Administration's observations regarding the manufacturing practices in the company's plant in Punjab comes after the recent inspection of the facility by the health regulator.
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An FDA Form 483 is issued to a company's management at the conclusion of an inspection when an investigator has observed any conditions that in their judgement may constitute violations of the Food Drug and Cosmetic Act and related Acts.
The USFDA has imposed ban on import of medicines manufactured at Ranbaxy's India-based factories into the US, the world's biggest drug market.