Dr Reddy's Laboratories reported an 890% YoY surge in March quarter profit at Rs 960.1 crore but shares tumbled nearly 7% to Rs 4,545 in Thursday's trade. While its revenue from operations increased by 15.28% YoY to Rs 5,843 crore, total expenses were down 4% at Rs 5,132.2 crore. US revenues fell 17% QoQ. Jefferies maintained its Buy rating on Dr Reddys Laboratories with a target price of Rs 5,650, while Prabhudas Lilladher downgraded the stock to Reduce with a revised target price of Rs 4,500 from Rs 4,900.