Introduction: Different parts of Grewia mollis Juss. (Malvaceae) are commonly used in folk medicine to treat several ailments, including diarrhea, ulcers, rickets, cough and fever. Although several studies have proved its therapeutic effectiveness, there are very few toxicological studies on the plant. Objectives: This study was carried out to evaluate the acute and sub-chronic toxicity of the aqueous extract of G. mollis stem bark (GM) in animals. Methods: In the acute study, rats were orally administrated with GM at doses of 150, 300, 600, 1200, 2400, 4800 and 9600 mg/kg to determine the oral medial lethal dose (LD50). In the chronic study, rats received three doses of GM (150, 300 and 600 mg/kg) for 28 days. After the treatments, food intake, body weights, biochemical, hematological and histopathological parameters were analyzed. Results: The LD50 was estimated to be >9600 mg/kg. No significant alterations in the animal’s body weight gain, relative organs weight, serum biochemical analysis, hematological or histopathological analyses of liver, kidneys, lungs, heart and spleen were observed. Conclusions: The results of this study provided evidence that oral administration of GM at dose of 600 mg/kg is relatively safe in rats and may not exert severe toxic effects.
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