The present study was conducted to determine the yield of extract quantitatively for the crude bark extracts of Cassia fistula, family Fabaceae is a high value medicinal plant collected from Osmania University, Hyderabad, Telangana State. The basis for the present study is that the bark of this plant is used by Gondu tribes of Adilabad District, Telangana State, India to treat hyperthyroidism in human beings. | Quantitative analysis of phytochemicals in the bark extracts of medicinally important plant Cassia fistula Linn.