Antimalarial chemotherapy with natural products and chemically defined molecules.
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In the present work we have described the in vivo antimalarial activity of six different plants. Two of them (Vernonia brasiliana and Eupatorium squalidum) were tested in a randomic approach among 273 crude extracts from plants; four (Acanthospermum australe, Esenbeckia febrifuga, Lisianthus speciosus and Tachia guianensis) were selected after screening 22 crude extracts from different medicinal plants used in Brazil against fever and/or malaria. We also studied chemically defined molecules and some of them showed antimalarial activity in vitro. Some aspects of recent research with natural products aiming to produce drugs are discussed.