Efficacy and safety of hangeshashinto for treatment of GERD refractory to proton pump inhibitors: Usual dose proton pump inhibitors plus hangeshashinto versus double-dose proton pump inhibitors: randomized, multicenter open label exploratory study

Background Proton pump inhibitor (PPI)-refractory gastroesophageal reflux disease (GERD) leads to a clinical decline in the quality of life (QOL). Therefore, new treatment options are needed. We performed a multicenter, randomized, parallel-group exploratory trial to determine the efficacy of hangeshashinto (HST) in patients with PPI-refractory GERD.