Treating heartburn or irritation of the esophagus caused by gastroesophageal reflux disease (GERD). It may also be used for short-term treatment of ulcers of the stomach or small intestine. It may also be used to decrease the risk of stomach bleeding in severely ill patients. It may also be used for other conditions as determined by your doctor. Omeprazole/sodium bicarbonate is a proton pump inhibitor (PPI) and sodium bicarbonate combination. The PPI works by decreasing the amount of acid produced in the stomach. The sodium bicarbonate works by slowing the breakdown of the PPI in the stomach, which helps to increase absorption of the PPI.