GHK-RDSR capsule is a combination medicine that contains two active ingredients: rabeprazole and domperidone. Rabeprazole is a proton pump inhibitor (PPI) that works by reducing the amount of acid produced in the stomach. Domperidone is a prokinetic agent that works by increasing the movement of food through the stomach and intestines. GHK-RDSR capsule is used to treat gastroesophageal reflux disease (GERD) and peptic ulcer disease (PUD). GERD is a condition in which stomach acid backs up into the esophagus, causing heartburn and other symptoms. PUD is a condition in which an ulcer develops in the lining of the stomach or small intestine.