Common Heron, sbil Herb

Geranium mainly contains geraniin, gallic acid, succinic acid, quercetin and its glycosides, etc. The leaves contain the most tannins, and the tannin content varies with the season: it is generally lowest from December to February of the following year, then gradually increases, and is highest from June to August.

The decoction strongly inhibits Staphylococcus aureus, group B streptococci, pneumococci, Moraxella catarrhalis, Shigella flexneri, and influenza virus. At certain doses, Laoguancao inhibits intestinal peristalsis and has an antidiarrheal effect; at large doses, however, it promotes intestinal peristalsis and may cause purgation. Its tincture and decoction have marked antitussive effects. Alkaloid constituents of Laoguancao also have antioxidant activity.

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