The stock tanked 6.23 per cent to end at Rs 285.40 on BSE. During the day, it plunged 8.29 per cent to Rs 279.10.
At NSE, shares of the company tumbled 6.55 per cent to close at Rs 284.90.
The company's market valuation fell by Rs 171.56 crore to Rs 2,593.44 crore.
On volume front, 1.40 lakh shares of the company were traded on BSE and over 6 lakh shares changed hands at NSE during the day.
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The company had posted a net profit of Rs 23.13 crore for the corresponding period of the previous fiscal, Unichem Laboratories said in a filing to BSE.
Standalone total income from operations of the company, however, rose to Rs 368.03 crore for the quarter under consideration as against Rs 309.79 crore for the same period year-ago.
Unichem manufactures and markets pharmaceutical formulations in India and several other markets across the world.