Which type of medication is classified as an antacid?

The classification of medication as an antacid specifically pertains to its role in reducing stomach acid. Antacids are compounds that neutralize stomach acid and can help relieve symptoms associated with conditions like heartburn, indigestion, and acid reflux. These medications work by providing a basic (alkaline) environment, which counteracts the acidity in the stomach, thereby alleviating discomfort and protecting the stomach lining.

In the context of the other options, pain relievers target pain symptoms, infection fighters (such as antibiotics) combat bacterial infections, and seizure control agents are medications used to manage epilepsy and other seizure disorders. Each of those categories has distinct mechanisms of action and purposes that do not address the reduction of stomach acid, which is the fundamental characteristic of antacids. Hence, the identification of an antacid as a stomach acid reducer is accurate and reflects its therapeutic use.