The stock dipped 7.39 per cent to Rs 732 on BSE.
On NSE, it plunged 7.48 per cent to Rs 731.
The stock was the top loser among the blue-chip Sensex and Nifty scrips.
The warning letter follows inspection of the facility in September 2014 by US Food and Drug Administration (USFDA) inspectors.
"Post the September 2014 inspection, the USFDA has withheld future product approvals from the Halol facility. This situation may continue until all issues are resolved.
"Sun Pharma will respond to this warning letter with a detailed plan within the stipulated time frame," it said.
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