If you are using antacids regularly, notify your doctor. If you have chronic heartburn or GERD, your doctor may recommend an H2 blocker. These drugs inhibit the stomach from secreting acid in the first place. These drugs are powerful inhibitors of acid production and are generally used for a limited time. Simethicone is known as a 'defoaming' agent that breaks up gas bubbles and helps to reduce excess stomach and intestinal gas.
Alginic acid creates a foam barrier between the stomach and the esophagus.
Usually used in combination with acid suppressing drugs. Has a protective effect on stomach mucosa and an antibacterial effect against H. pylori. Oxford University Press. Harper Collins Publishers. The Gastrointestinal Sourcebook .