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Simarouba versicolor is popularly known as pau-paraiba. It belongs to the Simaroubaceae family and is found in the Northeast of Sao Paulo and in some parts of the states of Para and Mato Grosso do Sul. It is known that this and other species from this genus have several activities: insecticides, anti-inflammatory, antitumor, anthelmintic, among others. The effects of ethanolic extract of the bark of S. versicolor (Sv-EtOH) on the reproductive system of rats were investigated; also the influence of estrogenic and/or antiestrogenic activity, estrous cycle, pregnancy, lactation and offspring development was observed. In the experimental protocols with ethanolic extract of S. versicolor, the doses were 10, 20 and 40 mg/kg. To evaluate estrogenic and anti-estrogenic activity, uterotrophic assay and histopathology of the uterus were performed. In the estrous cycle tests, animals were treated daily, for 30 days, to count number of cycles and record the biochemical profile. During pre-implantation and post-implantation, the effect of the extract on pregnancy, lactation and development of the progeny was observed. Uterotrophic assay exhibited anti-estrogenic activity at extract doses of 10, 20 and 40 mg/kg. The animals exposed to all doses had no changes in their estrous cycle, pregnancy, lactation and biochemical profile. All results were within normal range; however, creatinine concentration increased significantly at all doses as compared to the control. The ethanol extract of S. versicolor presented antiestrogen activity, low systemic toxicity and had no reproductive toxicity at investigated doses.   Key words: Simarouba versicolor, reproduction, rats.

Toxicity effects of ethanol extract of Simarouba versicolor on reproductive parameters in female Wistar rats