This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
From Sodium Bisulphate in solution with Metallic Zinc. 3Na Hso3 + Zn =Na2S2O3 + Na2S2O3 + ZnO, + H2O. Or pass Sulphurous Anhydride into a solution of Soda (or Sodium Carbonate) with Sulphur. So2 + 2Na(OH) + S = Na2S2O3 + H20.
Dose, 5 to 20 gr.; .30 to 1.20 gm.
Sodium sulphite solutions (1 in 8) may be used externally as mild antiparasitics. This body is, in the stomach, decomposed by the acids there and gives off sulphurous anhydride. It may, therefore, be given to arrest fermentation. If any remains un-decomposed, it is absorbed as a sulphite. No other action is known. They are very rarely given in medicine, but in sufficient doses might produce the effects of sodium sulphate.
14. Sodii Arsenas, see Arsenic.