The root is alterative, antispasmodic, demulcent, diuretic, emollient, expectorant, laxative, moderately pectoral and tonic. The root has also been shown to have a hormonal effect similar to the ovarian hormone. Liquorice root is much used in cough medicines and also in the treatment of catarrhal infections of the urinary tract. It is taken internally in the treatment of Addison's disease, asthma, bronchitis, coughs, peptic ulcer, arthritis, allergic complaints and following steroidal therapy. It should be used in moderation and should not be prescribed for pregnant women or people with high blood pressure, kidney disease or taking digoxin-based medication.
Prolonged usage raises the blood pressure and causes water retention.
Externally, the root is used in the treatment of herpes, eczema and shingles. The root is harvested in the autumn when 3 - 4 years old and is dried for later use. Root - raw or used as a flavoring. A sweet and delicious flavor, but the root is very fibrous. The root contains glycyrrhizin, a substance that is 50 times sweeter than sucrose.