The stock slumped 5.82 per cent to settle at Rs 756.90 on BSE. During the day, it dived 7.18 per cent to Rs 745.95 -- its 52-week low.
On NSE, the stock plunged 5.78 per cent to end at Rs 756.95.
The company saw an erosion of Rs 11,266.84 crore to Rs 1,82,143.16 crore in market valuation.
The stock was the biggest loser on Sensex and Nifty indices.
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The company had posted a net profit of Rs 2,050.22 crore for the same period last fiscal, Sun Pharmaceutical Industries had said in a statement.
Consolidated net sales declined to Rs 6,803.31 crore for the quarter under consideration as against Rs 7,979.31 crore for the same period a year ago.
Sun Pharma MD Dilip Shanghvi had said: "Our performance for the quarter and first half FY16 has been impacted by lower sales growth, volatile currency movements and supply constraints.