The stock skyrocketed 20 per cent to end at Rs 30.30 -- its 52-week high -- and also hit the upper circuit limit on the BSE.
On NSE, shares of the company soared 19.88 per cent to close at Rs 30.15.
"The US Food and Drug Administration (USFDA) has cleared Montelukast Sodium, a bulk drug/API manufactured by Morepen Laboratories, for sale in the US market," the company said in a regulatory filing.
Morepen is the market leader for Montelukast in India with over 50 per cent market share, supplying to almost all major finished dosage manufacturers in India, it said.
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