Pharmacology: The combination of Aluminum hydroxide and Magnesium hydroxide makes an antacid that acts to neutralize stomach acid and inactivated pepsin, so the pain in the pit of the stomach due to irritation by stomach acid and pepsin is reduced. In addition, the laxative effect of magnesium hydroxide will reduce the constipation effect of aluminum hydroxide. Simethicone reduces gas bubbles in the gastrointestinal tract and causing less bloating.