After a weak opening, shares of the drug firm further tumbled 19.69 per cent to Rs 335 on the BSE.
On the NSE, the stock dived 19.75 per cent to Rs 335.
The company's market value tanked by Rs 3,156 crore to Rs 14,520 crore.
"With this import alert, the operations of the company in US business which contributes 40 per cent could come under impact, unless it can compensate for the same at the earliest and mange a smooth supply of key raw material," said Sarabjit Kour Nangra, VP-Research, Pharma, Angel Broking.
The company is disappointed with the recent US Food and Drug Administration (USFDA) action and would like to apologise to all its stakeholders for the inconvenience caused by the suspension of shipment, Ranbaxy Laboratories said in a statement.
"This development is clearly unacceptable and an appropriate management action will be taken upon completion of the internal investigation," Ranbaxy CEO and Managing Director Arun Sawhney said.
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