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Background: Ginsenosides have been widely used clinically for many years and were regarded as very safe. However, a few researches on the toxicities of these kinds of agents showed that some ginsenosides may have side-effect on the rats or dogs. So it is extremely necessary to further clarify the potential toxicity of ginsenosides. This study was carried out to investigate long-term toxicity and genotoxicity of 25-methoxydammarane-3, 12, 20-triol (25-OCH 3 -PPD), a new derivative of ginsenoside, in beagle dogs., Methods: Twenty-four beagle dogs were divided randomly into four treatment groups and repeatedly orally administered with 25-OCH 3 -PPD capsule at 60, 120, and 240 mg/kg/day for 91 consecutive days. Ames, micronucleus, and chromosomal aberration tests were established to analyze the possible genotoxicity of 25-OCH 3 -PPD., Results: There was no 25-OCH 3 -PPD-induced systemic toxicity in beagle dogs at any doses. The level of 25-OCH 3 -PPD at which no adverse effects were observed was found to be 240 mg/kg/day. The result of Ames test showed that there was no significant increase in the number of revertant colonies of 25-OCH 3 -PPD administrated groups compared to the vehicle control group. There were also no significant differences between 25-OCH 3 -PPD administrated groups at all dose levels and negative group in the micronucleus test and chromosomal aberration assay., Conclusion: The highest dose level of 25-OCH 3 -PPD at which no adverse effects were observed was found to be 240 mg/kg per day, and it is not a genotoxic agent either in somatic cells or germs cells. 25-OCH 3 -PPD is an extremely safe candidate compound for antitumor treatment., (© 2018 The Korean Society of Ginseng, Published by Elsevier Korea LLC.)