Magnesium sulfate has a wide range of clinical uses. It can be taken orally as a laxative and cholagogic antispasmodic, and it can be used as an anticonvulsant, lowering blood pressure, treating asthma and correcting hypomagnesia symptoms when given intramuscular or intravenously.

　　Recent studies have found that topical magnesium sulfate can also reduce inflammation and swelling.

　　Magnesium sulfate solution is a hypertonic solution for the tissue fluid, and local wet compress can produce high osmotic pressure. According to the principle of high osmotic pressure balance, the edema fluid of the swollen tissue can be sucked out in a short time and the swelling can be reduced, so as to reduce the local damage caused by edema and play a therapeutic role.

　　The magnesium ion protects the vascular endothelial cells and improves blood circulation, thereby reducing inflammation and discomfort in the affected area.

　　A lot of people in the intramuscular injection or intravenous fluids (after intravenous indwelling needle or disposable infusion sets), can form induration or bruises around the eye of a needle, some newborns and the elderly patients with even vein inflammation, usually because of the stimulation of drugs, drug absorption is slow, injection depth is not enough, local blood circulation, local bacterial contamination, etc.

　　A solution of magnesium sulfate can be applied externally to relieve symptoms.

　　Specific method is: gauze or absorbance cotton in 50% magnesium sulfate solution to fully infiltrate, according to the symptoms of the affected place hot compress or cold compress.

　　If be phlebitis, choose cold compress more, if affected place scleroma is not red or when the temperature is lower, can choose hot compress.

　　Generally depending on the affected area, once a day to several times, each time wet compress 30 minutes.

　　It should be noted that if the infusion of strong irritant drugs do not heat, so as not to speed up the local blood circulation, aggravating exudation.