Analgesic activities of the medicinal plants of Wedelia trilobata, Wedelia biflora and Eclipta alba in standard experimental animal models.
Comparative study on analgesic activity was carried out using ethanol extracts in animal models. Wedelia trilobata (EEWT), Wedelia biflora [Melanthera biflora] (EEWB) and Eclipta alba (EEEA) was evaluated by acetic acid induced writhing method and hot plate assay to assess analgesic activity in mice. It was found that the extract caused an inhibition on the writhing response induced by acetic acid in a dose dependent manner. Dose of 500 mg/kg EEWT, EEWB, EEEA and Aspirin could block the writhing response by 49.17, 49.45, 55.23 and 68.68% (p<0.001), respectively. It was also indicated that the EEEA showed significant antinociceptive action in hot plate reaction time method in mice. This effect was comparable to that of standard drug morphine treated controls. The results reflects that analgesic effects and therapeutic efficacy of the extract on animal models which are comparable with those of standard drugs such as aspirin and morphine.