Everything Else . As you probably know, some chemicals are acids, like vinegar or lemon juice, and others are basic, like ammonia.
Antacids neutralize the the very strong acid in the stomach by chemically combining with it.
This relieves symptoms of excess acid, like heartburn, but does not correct the problem that caused it, which could just be too much highly seasoned food or could be an ulcer, a stomach inflammation or even cancer. Antacids may have unpleasant or dangerous side effects. Unless a doctor recommends it, an antacid should not be taken more than occasionally. Aluminum hydroxide and other aluminum compounds are weak though effective antacids but can cause antacids and can cause constipation. They are frequently sold in combination with magnesium compounds, which are stronger antacids that can cause diarrhea.