著者

本間 真人 石原 三也 千 文 幸田 幸直

出版者

公益社団法人 日本薬学会

雑誌

YAKUGAKU ZASSHI (ISSN:00316903)

巻号頁・発行日

vol.126, no.10, pp.973-978, 2006 (Released:2006-10-01)

参考文献数

33

被引用文献数

19 32

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Typical adverse effects of Shakuyaku-kanzo-To (SKT), an herbal medicine containing licorice, is a licorice-induced pseudoaldosteronism with hypokalemia and hypertension. The risk factors for this side effect are still unclear. To identify the risk factors, we surveyed 37 cases of licorice-induced pseudoaldosteronism in the literature and serum potassium levels in our patients receiving SKT and Shosaiko-To (SST), which contain 6 g and 1.5 g of licorice in the daily dose, respectively. In the case report survey, pseudoaldosteronism developed a median 35 (range 2—231) days after the administration of SKT, which is shorter than after SST (450, range 150—2190 days) and other licorice products including glycyrrhizin (210, range 14—730 days). A significant correlation was observed between the glycyrrhizin contents in the licorice preparations and the dosing periods for developing pseudoaldosteronism (r=-0.700, p < 0.01). A negative correlation was also observed between serum potassium level and dosing period for SKT, but not for SST. The difference in age (65.3 ± 11.6 vs. 57.2 ± 17.3 y) and dosing period (57.3 ± 66.3 vs. 19.0 ± 24.3 days) between the patients with and without hypokalemia after the administration of SKT was statistically significant (p < 0.05). The occurrence rate of hypokalemia including pseudoaldosteronism was around 80% with SKT administration for more than 30 days for patients exceeding 60 years old. It was suggested that patient age (>60 y) and dosing period of SKT (>30 days) might be risk factors for developing pseudoaldosteronism or hypokalemia as well as coadministration of drugs inducing hypokalemia.