Horehound (hoarhound), Marrubium vulgare. Official in Japan and the U. S. P. VIII.

Stimulant, tonic, and slightly laxative. Warm infusions produce diaphoresis. The cold infusion is a bitter tonic. In the form of a syrup it is regarded as a tonic expectorant. The fl. may be given in doses of 20 to 30 minims.