^17th Global Toxicology and Risk Assessment Conference

Biography

Biography: Yongwei Luo

Abstract

Miscarriage is a common obstetric disease, occurring in 15%–40% women of reproductive age. Various traditional Chinese medicines treating miscarriage have been widely used throughout the pregnancy race, which were defined as one category of the complementary and alternative medicines by the National Center for Complementary and Alternative Medicine. Thereby, the long term toxicology of these medicines and their impacts on liver is more and more concerned by clinical physicians and infertility couples. Zishen Yutai pill (ZYP) is one of the most commonly used Chinese medicines for miscarriage. The objective of this 39-week study was to investigate the potential long-term toxicity and hepatotoxicity of ZYP administered to beagle dogs at dose levels of 1.5, 3.0 and 6.0 g/kg bw/day by oral gavage and to determine reversibility of any findings after the 4-week recovery period. Physiological saline was used as control respectively. Clinical observation, mortality, body weight, blood pressure and electrocardiogram, clinical pathology, organ weights, histopathology, hormones, and traditional and potential hepatotoxicity biomarkers were detected and recorded. There were no mortality or toxic clinical symptoms and abnormalities in both sexes of beagle dogs except for the expected exaggerated pharmacological effects typically associated with female reproductive organs, which typically induced on endometrial thickening, dilated lactiferous ducts in mammary gland and vigorous-growth oocytes in ovary. No obvious ZYP-related hepatotoxicity was observed after 13 and 39 weeks of ZYP treatment. Based on these results, the no-observed-adverse-effect-level (NOAEL) of ZYP in dogs is higher than 6.0 g/kg when administered orally for 39 consecutive weeks. Therefore，this study has suggested that no drug-related toxicity was induced by ZYP administered up to 6.0g/kg/day to beagle dogs for 9 months. Since this dose is approximately 24 times as much as the clinical dose, it indicates a good safety margin of this product