% RSD of peak area
S. No Parameters Chromatographic conditions Tranexamic acid Mefenamic acid
1 Altered flow rate 0.9 mLmin-1 6.6 5.8
2 1.0 mLmin-1 1.2 0.9
3 1.1 mLmin-1 0.7 0.5
4 Altered pH pH 3.4 2.3 1.9
5 pH 3.5 1.2 0.9
6 pH 3.6 1.3 3.1
Table 5: Robustness study of Tranexamic acid and Mefenamic acid.