* Organic compounds contain carbon as a primary component, typically bonded to hydrogen and other elements like oxygen, nitrogen, and sulfur.

* Inorganic compounds lack carbon as a primary component.

Common antacid ingredients:

* Calcium carbonate (CaCO3): Inorganic, made up of calcium, carbon, and oxygen.

* Magnesium hydroxide (Mg(OH)2): Inorganic, made up of magnesium, oxygen, and hydrogen.

* Aluminum hydroxide (Al(OH)3): Inorganic, made up of aluminum, oxygen, and hydrogen.

While some antacids might contain small organic molecules, the main active ingredients are inorganic compounds.