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  • Title: Effects of eppikahangeto, a Kampo formula, and Ephedrae herba against citric acid-induced laryngeal cough in guinea pigs.
    Author: Minamizawa K, Goto H, Shimada Y, Terasawa K, Haji A.
    Journal: J Pharmacol Sci; 2006 Jun; 101(2):118-25. PubMed ID: 16778362.
    Abstract:
    To evaluate the efficacy of three common antitussive Kampo formulas, eppikahangeto (EPP), bakumondoto (BAK), and shoseiryutogomakyokansekito (SGM), a new cough model of guinea pig was used, which could specifically induce a laryngeal cough by microinjection of citric acid solution into the larynx. Kampo extract was dissolved in water and the animals were given access ad libitum for 3 days, and then the number of coughs during 10 min was counted. EPP extract decreased the number of coughs dose-dependently (0.3% extract, -22.9 +/- 6.6%, P<0.01; 1.0% extract, -32.4 +/- 5.5%, P<0.01). BAK extract and SGM extract had no significant effect. Intraperitoneal injection of codeine (60 mg/kg) also decreased the number of coughs (-36.1 +/- 9.1%, P<0.05). Furthermore, Ephedrae herba (EH) extract reduced the number of coughs (-18.3 +/- 6.0%, P<0.05), but the extract of EPP without EH did not. These results suggest that EPP has an antitussive effect against laryngeally-induced cough in guinea pigs, and the crucial herbal medicine is EH.
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