Doctors sometimes recommend magnesium oxide for the treatment of indigestion. Other uses for magnesium oxide include the treatment of duodenal ulcers, dyspepsia, gastric ulcers and gastroesophageal reflux disease. The treatment of constipation, renal stones, hypomagnesemia and pathological hypersecretory disorder are additional uses.
Most people get the appropriate amount of magnesium through nutrition, but in some instances, a person’s magnesium level becomes depleted faster than the person is able to consume magnesium. This is sometimes the case when a person takes diuretics, eats a poor diet, is an alcoholic or suffers from a medical condition that causes absorption problems, excessive diarrhea or vomiting.
Manufacturers sell magnesium oxide under the brand names Phillips’ Cramp-Free, MagGel, Mag-Ox 400 and Mag-200. Adults use it to treat acid indigestion, sour stomach and heart burn. Doctors may also recommend magnesium oxide for use as a laxative prior to surgery.
The recommended dosage of magnesium oxide varies based on use. For example, for duodenal or gastric ulcer treatment, doctors recommend 400 to 800 milligrams of magnesium oxide by mouth once daily. For treatment of renal stones, 140 to 420 milligrams by mouth once daily is the recommendation. For constipation, doctors recommend taking two to four 500-milligram caplets daily with 8 ounces of water. Magnesium oxide comes in both tablet and capsule forms.