Horehound herb is a home remedy for the common cold, states Drugs.com. It is an expectorant that is an ingredient in several cold preparations and cough lozenges. It is also used for digestion problems, such as gas, bloating, indigestion, loss of appetite and constipation, explains WebMD.
Horehound has chemicals that thin mucus secretion, reports WebMD. This makes it easier to cough up phlegm. The chemicals in horehound also reduce inflammation and spasms in the intestines and stomach. Horehound relieves breathing and lung problems, such as bronchitis, asthma, tuberculosis and whooping cough. Pregnant women should not use horehound since it has emmenagogue which stimulates menstrual flow and may stimulate abortive effects, explains Drugs.com.