Potential long-term toxicity of repeated orally administered doses of artemether in rats.

Shuhua Xiao Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Yuanqing Yang Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Qiqing You Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Jürg Utzinger Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Huifang Guo Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Jiao Peiying Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Jinying Mei Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Jian Guo Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Robert Bergquist Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Marcel Tanner Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai.

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Artemether, an efficacious antimalarial drug, effectively prevents patent schistosome infections and morbidity, as established in laboratory models and in clinical trials. In view of concern about the potential long-term toxicity, rats were treated orally with 80 mg/kg artemether once every 2 weeks for 5 months. After the final treatment, routine blood test results were normal except for reversible reductions of reticulocyte counts and reversible increases in hemoglobin levels. Liver and kidney function and histopathological examination showed no differences between treated and untreated rats. Administration of 400 mg/kg artemether resulted in transient focal vesicle degeneration of the liver or slight damage to the proprius layer lamina of intestinal villi. No damage to the central nervous system tissues, including cerebrum, cerebellum, midbrain, thalamus, pons, medulla oblongata, and spinal cord, was seen at either concentration. There were no alterations in electrocardiograms during the 6-month treatment period. We conclude that 80 mg/kg artemether administered once every 2 weeks is safe, and doses of 400 mg/kg do not result in evidence of neurotoxicology.

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