The effects of acute and subacute toxicity of 1,8-cineole in Kunming mice were studied. After acute oral administration, the LD50 value (95% CL) was 3849 mg/kg (3488.8~4247.1 mg/kg). In the subacute toxicity study, there were no significant differences in body weight and relative organ weight between the control group and 1,8-cineole treatment groups. The histopathological examinations showed that granular degeneration and vacuolar degeneration appeared in liver and kidney tissue after administration of high dose of 1,8-cineole. Under electron microscopy, a series of ultrastructural changes were observed: The electron microscopy assays indicated that the influence of 1,8-cineole on the target organ at the subcellular level were mainly on the mitochondria, endoplasmic reticulum and other membrane type structure of liver and kidney.
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