Study on the acute and subchronic oral toxicity of Calculus Bovis Sativus in rats.

This study aims to assess the acute and subchronic toxicity of Calculus Bovis Sativus (CBS), which is an ideal substitute for natural Calculus Bovis. After conducting a test of acute toxicity with KM mice of both sexes, it was determined that oral CBS had a lethal dosage (LD50) of greater than 9.26 g/kg BW. For ninety days, Wistar rats were fed on CBS orally at dosages of 0, 167, 501, and 1503 mg/kg BW/day, respectively, as part of the subchronic investigation. A comparison of the controls with the 1503 mg/kg and 501 mg/kg dosage groups revealed significant differences in the hematological and serum biochemical parameters, such as RBC, HGB, MONO%, PLT, LYMPH% and GLU, TP, ALB, and Ca²⁺, were observed. However, values of the above parameters fell within our laboratory's normal range. In terms of body weight, food intake, urinalysis, clinical chemistry, and pathology, no other adverse effects were observed. After 90 days of exposure, the no observed adverse effect level (NOAEL) of CBS in rats was determined to be 1503 mg/kg BW/day.