The scrip dipped 4.71 per cent to Rs 390 at BSE.
On NSE, shares of the company fell by 4.45 per cent to Rs 390.
In the previous session also, the stock had plummeted by 13 per cent.
An inspection was conducted by the US Food and Drug Administration (USFDA) at two of its facilities recently -- the Active Pharmaceutical Ingredients (API) manufacturing facility at Manali, near Chennai, and the Pharmaceutical Formulations facility at Kothur, near Hyderabad, in early February and March, respectively, Natco said in a statement on Sunday.
Natco has already sent response and compliance report for these observations and believes that there would be no adverse impact to its current or future pipeline products coming from these facilities, it added.