The stock ended the day at Rs 1,419.90, up 1.62 per cent on BSE. During the day, it jumped 3.69 per cent to Rs 1,448.80.
At NSE, shares of the company went up 1.77 per cent to close at Rs 1,421.50.
The approval by the US Food and Drug Administration (USFDA) is for multiple strengths of 6.25mg and 12.5mg of the generic version of Janssen Pharmaceuticals' Axert tablets, Ajanta Pharma said in a BSE filing yesterday.
Almotriptan tablets is a part of an "ever growing portfolio" that the company has developed for the US market, the company added.