Level Drug added, µg Drug recovery, µg Recovery % Mean ± SD (%) % RSD 50% 5 4.860 97.20 98.64 ± 0.34 0.19 5 5.015 100.30 5 4.921 98.42 100% 10 9.833 98.33 100.02 ± 0.41 0.54 10 10.14 101.41 10 10.03 100.30 150% 15 15.465 103.10 99.20 ± 018 0.26 15 14.89 99.30 15 14.93 99.51

Table 4: Recovery data obtained for different mixtures of Nisoldipine and results of accuracy data using the proposed HPLC method.