The Sulphate of Magnesia, or Epsom Salt, contains approximately 50% anhydrous magnesium sulphate. It should be kept in tight containers.

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C2H5OH..............................................

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Magnesium Sulphate is a drastic hydrogogue purgative. Dose, 15 Gm. Epsom Salt is also one ingredient in Infusum Sennae Compositum.

Other official preparations of Magnesia are the Carbonate, and the Light and Heavy Oxides, each of which is somewhat dubiously used as an antacid.