RESUMO
<p><b>OBJECTIVE</b>To investigate the antipyretic and anticonvulsant activities of n-hexane fraction of Viola betonicifolia (V. betonicifolia).</p><p><b>METHODS</b>The antipyretic effect was scrutinized using brewer's yeast induced pyrexia and anticonvlsion effect was tested using pentylenetetrazol and strychnine induced convulsion in mice.</p><p><b>RESULTS</b>N-hexane fraction of V. betonicifolia demonstrated highly significant antipyretic activity during various assessment times (1-5 h) when challenged in yeast induced pyrexia test. The effect was in a dose dependent manner with maximum attenuation (82.50%) observed at 300 mg/kg i.p. When tested in pentylenetetrazol induced convulsion test, the 1st stage (Ear and facial twitching) and 2nd stage (Convulsive wave through the body) was 100% protected during 24 h at all the test doses (300, 400 and 500 mg/kg i.p.), while the latency time of remaining stages was significantly increased. The maximum effect was observed by n-hexane fraction of V. betonicifolia at 400 and 500 mg/kg i.p., as the latency time for generalized clonic-tonic seizure (5th stage) was increased up to 25.34 min. However, n-hexane fraction of V. betonicifolia had no protection in strychnine induced convulsion test.</p><p><b>CONCLUSIONS</b>In conclusion, phytopharmacological studies provide scientific foundation to the folk uses of the plant in the treatment of pyrexia and neurological disorders.</p>