The medicinal part is the flowering herb.
Flower and Fruit
The large, pale yellow, bilabiate flowers are in false whorls on the branch ends. The calyx is evenly 5-dentate and covered in patent glandular hairs. The upper lip of the corolla is domed, finely dentate, and pubescent. The lateral tips of the trilobed lower lip are wide, obtuse, and have one hollow erect tooth at either side of the base. The stamen halves are horizontal. The fruit is smooth.
Leaves, Stem, and Root
The herb grows 15 to 100 cm high. The stem is erect, heavily branched and downy, with unthickened nodes. The leaves are ovate and serrate. The lower ones are long petioled, the upper are short petioled.
Hemp Nettle is found in southern and central Europe.
Hemp Nettle consists of the aboveground parts of Galeopsis segetum Necker (synonym Galeopsis ochroleuca Lamarck) and is gathered in the wild during the flowering season.
Actions & Pharmacology
Iridoide monoterpenes: including harpagide, 8-O-acetylharpagide, antirrinoside, 5-O-glucosylantirrinoside
Silicic acid (to some extent water-soluble)
The herb acts as expectorant, due to its saponin content, and as an astringent because of the tannins, silicic acid, iridoids, and antirrhinoside.
Indications & Usage
Approved by Commission E:
In folk medicine, the herb is used for pulmonary afflictions and as a diuretic.
Precautions & Adverse Reactions
Health risks or side effects following the proper administration of designated therapeutic dosages are not recorded.
Mode of Administration
Ground and cut herb for teas and other galenic preparations for internal use.
To prepare an infusion, pour boiling water over 2 g of comminuted drug, strain after 5 minutes.
Average daily dose: 6 g drug. One cup of the infusion may be taken several times daily and, if preferred, sweetened with honey.