There are several over-the-counter (OTC) medications available for heartburn and acid reflux. The most commonly used OTC medications are antacids, H2 blockers, and proton pump inhibitors (PPIs).

Several available over-the-counter (OTC ... can cause side effects such as constipation and diarrhea. Histamine-2 (H2) blockers, also called H2-receptor antagonists, are another OTC acid reflux ...

Gastroesophageal reflux disease (GERD) impacts about 20% of adults in the U.S. Here's what experts want you to know about causes and treatments.