This gives it the rare and valuable property of a remote haemostatic, erroneously supposed to be possessed by so many useless drugs.
This action on the vessels is so marked as to constitute the drug a haemostatic, not only locally but also remotely.
Ergot is used in therapeutics as a haemostatic, and is very valuable in haemoptysis and sometimes in haematemesis.
Medicinally, gallic acid has been, and is still, largely used as an astringent, styptic and haemostatic. Gallic acid, however, does not coagulate albumen and therefore possesses no local astringent action.
So far is it from being an haemostatic that, if perfused through living blood-vessels, it actually dilates them.