This study aimed to conductpre-clinical toxicology testing to investigate the toxicity of Lippia sidoides Cham., Myracrodruon urundeuva Fr. All., Stryphnodendron adstringens (Mart.) Coville and Caryocar brasiliense Camb., by determining the 50% (LDL50) lethal dose. In the investigation of the LD50, groups of Swiss mice of the same sex were used (n=150; 30 animals per plant and all inoculated intraperitoneally with serial dilutions of the aqueous fraction obtained from the leaves of plants. After inoculation, the animals were observed along a period of 14 days in order to observe the dead, sick and survivors rate. In mice inoculated intraperitoneally, the acute pre-clinical toxicology testing demonstrated toxicity equal to 0,31mg mL-1 LD50 mL-1 for all plants. The exception was for Stryphnodendron adstringens, which presented toxicity equal to a 0,25mg mL-1DL50 mL-1 and values expressed in terms of dilution. Research should be conducted to obtain data on toxicity of the plants in other ways to ensure the use in human and animal health. Therefore, the studied plants should be used with caution. They present a relatively mild toxic potential, but it may be harmful to users if they are not properly utilized.
toxicity; Lippia sidoides; Myracroduon urundeuva; Stryphnodendron adstringens; Caryocar brasiliense