"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.
"This gives Morepen an entry into the Rs 2,000 crore (approximately USD 300 million) US market for Montelukast. The first commercial orders for the bulk drug are expected in the second quarter of the next financial year," it added.
Morepen said patent for Montelukast has expired in all markets worldwide.
Shares of the company rallied 16.44 per cent to trade at Rs 29.40 apiece on BSE.