Intramuscular or intravenous injection inhibits and relieves spasms in the central nervous system; magnesium ions inhibit the release of acetylcholine from motor nerve endings, block nerve and muscle conduction, relax skeletal muscles, and prevent and control convulsions (eclampsia); magnesium ions act directly on uterine muscle cells, antagonize the effect of calcium ions on uterine muscle contraction, and inhibit uterine contraction; 50% solution applied externally can relieve inflammation and pain through hot compress; oral administration is difficult to absorb, increases the osmotic pressure in the intestinal cavity, and a large amount of water causes the intestine to expand, leading to diarrhea; oral administration of 33% concentration has a choleretic effect. It is suitable for severe pregnancy-induced hypertension syndrome, threatened premature labor, cervical edema during labor, constipation, etc.

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