(Marrubium vulgare). Cough tonic, mild laxative. Bitter leaves used in cough syrups and throat lozenges. Esteemed by the Romans for its medicinal virtues. Some authors derive its name from the Hebrew marrob (bitter juice); may have been one of the bitter herbs which the Jews were ordered to take for the Feast of the Passover. Plant juice may cause dermatitis.
Horehound root is soothing to the respiratory system and is a natural expectorant. This herb has been shown effective when used as a diaphoretic, diuretic, expectorant, stimulant, and tonic. Horehound is, above all, a remedy for coughing and bronchial problems. It has shown positive results in treating nervous heart conditions, and to calm overall heart action.