Milk of Magnesia is a brand name for magnesium hydroxide, a medication used to treat constipation
It's a type of laxative known as an oral osmotic; it works by drawing water into the colon from the body tissues surrounding it. This allows the stool to pass more easily.
Milk of Magnesia can be taken as a liquid or a tablet. A bowel movement should occur within a half hour to six hours after taking it.
Milk of Magnesia can also be used as an antacid It can help relieve heartburn, sour stomach, and acid indigestion.