Single-Dose Intramuscular Toxicity Study of SU-Eohyeol Pharmacopuncture in Rats

Objectives: This toxicological study was performed to assess for potential toxicity and to determine the approximate lethal dose of SU-Eohyeol pharmacopuncture (SUEP) following a single intramuscular injection of SUEP into male and female Sprague-Dawley (SD) rats.Methods: The groups in our experiment consisted of an experimental group treated with SUEP at a dose of 1.0 mL/animal and a control group injected with a normal saline solu-tion, and five male and female rats were placed in each group. Each animal was admin-istered a single intramuscular injection. We monitored all rats for clinical signs and body weight changes for 14 days after administration. At the end of the observation period, the rats were euthanized and autopsied, and localized tolerance examinations were conduct-ed at the site of administration of the test substance. Results: There were no deaths in either sex in the SUEP-treated group. There was no sig-nificant difference between the SUEP-treated group and the control group in the clinical signs and weight changes among the rats. In addition, no significant SUEP-related chang-es were observed on autopsy findings or local tolerance examinations at the injection site by histopathological examination. Conclusion: Our results suggest that the approximate lethal dose of a single intramuscu-lar administration of SUEP in female and male rats under the conditions of this study is greater than 1.0 mL/animal. To determine the safety of the use of SUEP in Korean medi-cal clinical practice, additional toxicity studies will be needed.