The stock, after making a weak opening, plummeted 14.83 per cent to Rs 437 on the BSE.
On the NSE, it dived 15.34 per cent to Rs 436.10.
The US Food and Drug Administration (USFDA) cited violation of current good manufacturing norms for its action.
The USFDA has refused admission to all drugs made at the company's Pithampur and Silvassa facility, Ipca Laboratories said in a BSE filing yesterday.
The ban on all drugs made at Pithampur (Madhya Pradesh) and Silvassa (Dadra and Nagar Haveli) will continue "until the company can demonstrate that the drugs manufactured from these manufacturing sites and intended for the US market are in compliance with CGMP," Ipca Laboratories added.
However, it said the US health regulator will reconsider the exception for Chloroquine Phosphate made at the Ratlam facility if shortage and/or medical necessity implications change.
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