The company in a filing to BSE said Ajanta Pharma US Inc has launched montelucast sodium granules, a generic version of Merck & Co, Inc's Singulair granules, in the US market.
The granules have been launched in cartons containing 30 individual sachets.
"The approval and launch of the granules are part of an ever growing portfolio that Ajanta Pharma has developed for the US market", the drug firm said.
Ajanta has so far received five abbreviated new drug application (ANDA) approvals from the US Food and Drug Administration (USFDA).
Shares of Ajanta Pharma today ended at Rs 1,334.55 apiece on the BSE, down 4.02 per cent from previous close.