Objective: The objective of this study was to determine the anti-inflammatory activity of methanol extract of Niebuhria apetala and its possible mechanism of action. Methods: Methanol extract of Niebuhria apetala leaf (NAL) was assessed for its anti-inflammatory activity by in vitro methods. Using albumin denaturation assay, proteinase inhibitory activity, membrane stabilization, and antilipoxygenase activity at different concentrations, in vitro anti-inflammatory activity was estimated. The standard drug used for this purpose was aspirin. Results: Methanol extract NAL at a concentration range of 100–500 μg/ml significant (p<0.01) protects the heat-induced protein denaturation. At the concentration of 500 mg/ml, NAL showed significant (p<0.01) inhibition of protease inhibitory action. Heat-induced hemolysis of erythrocyte, hypotonicity-induced hemolysis, and lipooxygenase activity were significant (p<0.01) inhibited at the concentration of 500 μg/ml. Conclusion: Finally, the present study indicates that methanol extract of Niebuhria apetala can be a potential source of anti-inflammatory agent.

<em>Hypericum </em>is a well-known plant genus in herbal medicine. <em>Hypericum mysorense</em> is well known in folklore medicine for its varied therapeutic potential. The <em>in vitro </em>antioxidant activity of petroleum ether, benzene, ethyl acetate, methanol and ethanol extract of leaf of <em>Hypericum mysorense </em>have been tested using various antioxidant model systems viz; DPPH, hydroxyl, superoxide, ABTS and reducing power. The scavenging effect increases with the concentration of standard and samples. Among the solvent tested, ethanol extract exhibited highest DPPH (116.33% inhibition), hydroxyl (101.84%), superoxide (116.09%) and ABTS (119.22%) radical scavenger activity. Methanol extract of <em>H.mysorense </em>shows the highest reducing ability. The aim and purpose of this study is to show the significant free radical scavenging potential of <em>H.mysorense </em>leaf which can be experimented for the treatment of various free radical mediated ailments