Heavy Magnesium Oxide IP/BP/EP/USP is a white or grayish-white powder that is made from naturally occurring minerals. It is an inorganic compound that is used in a variety of applications in the pharmaceutical and food industries. It has antacid, adsorbent, and antidiarrheal properties. It is used in laxatives, antacids, and as an excipient in tablet and capsule formulations. It is also used as an additive in food and beverages.