Medicinal plants may be defined as a group of plants that possess some special properties which qualify them as drugs or therapeutic agents and are used for medicinal purposes. 1 Even with the advent of technologies like combinatorial chemistry or computeraided drug design, medicinal plants containing bioactive chemical constituents are extensively responsible for the development of new drugs. 2 Molecules containing one or more unpaired electrons are called free radicals. In our body during the normal oxidation of foods, free radicals are constantly generated and about 1-4% of oxygen taken up in the body is converted to free radicals by oxidase enzymes. 3 For these free radicals, lipid peroxidation occurs which is responsible for the oxidation of sulfhydryl groups, protein deformation, DNA bases fragmentation which can result in the mutation of genetic sequences. Free radicals cause different diseases such as cancer, inflammation, respiratory and cardiovascular disorder, muscular dystrophy, diabetes and neurological disorder. 4 To neutralize these free radicals, antioxi