Magnesium Oxide Facts

Magnesium oxide is a compound with the chemical formula MgO. It is an ionic compound made of one magnesium atom and one oxygen atom. It is used as a supplement for various conditions.

Properties

• Magnesium oxide is hygroscopic, meaning it can absorb moisture from the atmosphere. The compound quickly forms magnesium hydroxide, Mg(OH)2 in the presence of water.

Applications

• Because magnesium oxide absorbs water readily, it is used by libraries to preserve books. Rock climbers and other athletes rub magnesium oxide on their hands to increase their grip, by removing sweat and moisture from the palms.

Medicinal Use

• Magnesium oxide is a supplement that can be given to patients with low magnesium levels. Magnesium is needed for proper functioning of muscles and nerves.

Side Effects

• When taken as directed, magnesium oxide may produce side effects, including diarrhea or upset stomach.

Drug Interactions

• Magnesium oxide may interact with certain medications such as fluoroquinolone antibiotics, tetracycline antibiotics and penicillamine. Inform your doctor of any medications you are on before taking magnesium oxide.