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Background  The search for new antimalarial drugs has become increasingly urgent due to plasmodial resistance to existing drugs. As part of this global effort, the present study aimed at evaluating the antimalarial activity of two traditionally used medicinal plants against the disease.    Methods  Acute toxicity and four-day suppressive effects of aqueous, methanol and chloroform extracts of the seed and leaf of  Brucea antidysenterica  and  Ocimum lamiifolium,  respectively, were investigated in Swiss albino mice using  Plasmodium berghei  using standard procedures.    Results  Methanol extract of the leaves of  O. lamiifolium  did not exhibit any sign of acute toxicity up to the dose of 2000 mg/kg body weight. However, all mice provided with seeds of  B. antidesenterica  at a dose of 2000 mg/kg body died within 24 h. The aqueous, methanol and chloroform crude extracts of  B. antidesenterica  significantly ( p  < 0.05) inhibited parasitaemia in a dose-dependent manner and prevented body weight loss at doses of 200, 400 and 600 mg/kg body weight. In addition, the extracts prolonged the mean survival time of  P. berghei -infected mice compared to the non-treated control. However, it did not prevent reduction in packed cell volume except the chloroform extract in three doses and methanol extract at 200 mg/kg and 400 mg/kg. Extracts from  O. lamiifolium  also exhibited significant ( p  < 0.05) antiplasmodial activities. The extracts did not prevent body weight loss and PCV reduction, especially in chloroform. The highest suppression was recorded from aqueous crude extract of  O. lamiifolium  with 35.53 % in the dose of 600 mg/kg. On the other hand, a similar higher suppression was found in both methanol and chloroform of crude extracts of  B. antidesenterica  with 47.70 %, 46.44 % of chemosuppression, respectively, in its highest dose tested.    Conclusion  Crude aqueous, methanol and chloroform extracts of the two medicinal plants possess acceptable antimalarial effects. However, further investigation should be pursued on toxicity study and to isolate the bioactive components responsible for the observed antimalarial action of the plants.

Antimalarial properties of crude extracts of seeds of Brucea antidysenterica and leaves of Ocimum lamiifolium