RT Journal Article SR Electronic T1 A PHYSICO-CHEMICAL STUDY OF THE ANTAGONISTIC ACTION OF MAGNESIUM AND CALCIUM SALTS AND THE MODE OF ACTION OF SOME ANALGESIC DRUGS JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 441 OP 448 VO 29 IS 1 A1 HIRSCHFELDER, A. D. A1 SERLES, E. R. YR 1926 UL http://jpet.aspetjournals.org/content/29/1/441.abstract AB 1. Magnesium salts tend to increase the water in oil phase of oil and water emulsions more than do calcium salts. 2. This action is due to the much greater solubility of magnesium oleate in oil and in other organic solvents. 3. The injection of magnesium salts into the body therefor tends to diminish the oil in water phase of a balanced emulsion; and the injection of calcium salts tends to restore it to the normal physiological balance. 4. The oridinary soporific drugs and also the "coal tar" analgesics tend to produce water-in-oil emulsions and thus to diminish ionic interchange between the interior and exterior of the nerve cells. This seems to furnish an explanation of the analgesic action of these drugs. 5. The effects of alkaloids upon magnesium sulphate action cannot be explained upon this basis until more is known regarding the physical and chemical conditions under which they circulate in the blood and are adsorbed by the tissues.