For immediate relief from heartburn, you can take an over-the-counter antacid containing calcium carbonate or magnesium hydroxide. For longer-lasting prevention, an H2 blocker like famotidine or a proton pump inhibitor (PPI) like omeprazole can help reduce stomach acid production. Since chest discomfort can sometimes mimic other health issues, please seek emergency medical care immediately if you experience chest tightness, pain radiating to your arm or jaw, or shortness of breath. If your reflux symptoms are frequent or do not improve with these over-the-counter options within a few days, please consult a healthcare professional for a tailored evaluation.