The purpose of this study was to determine the acute toxicity and moderate lethal dose of tannins obtained from the roots and aerial parts of the R. confertus Willd plant. Determination of acute toxicity and the average lethal dose of the samples was carried out according to the method of Litchfield and Wilcoxon. As a result of the studies, the death of animals in the studied doses did not occur. The tested drugs belong to the IV class of low toxic compounds. LD50 ≥5000 mg / kg.