Sulphate of magnesia is a valuable adjunct to astringent remedies for hemorrhage, because it helps to lessen arterial tension and capillary congestion at the same time that it obviates constipation. In menorrhagia it may be given with sulphuric acid; in haemoptysis, with ergot, acid, and digitalis (H. Dobell); and in hoematemesis, with alum and opium (Barlow).