Functional Dyspepsia means a pain or discomfort of epigastrium originated from the stomach or duodenum without any causative organic or metabolic disease. For its standard criteria, Rome IV diagnosis criteria was used, where more than on symptoms including bothersome postprandial fullness, early satiation, epigastric pain, and epigastric soreness should have been elicited at least 6 months before and continued for at least 3 months in total.~Refractory Functional Dyspepsia means a state that no symptom was improved in spite of appropriate treatment for the functional dyspepsia.~The pathogenesis of Functional Dyspepsia has not been fully identified yet. Its standard therapies include prokinetics, analgesics, H2-receptor antagonists, proton pump inhibitors, antacids, serotonin receptor antagonists, proton pump inhibitors, antacids, serotonin receptor antagonists, and antidepressants. As these therapies has lower efficacy and drug related adverse reactions, the RFD patients who do not respond to medication need another therapeutic option.~It may be challenging to discriminate the symptoms of FD from the symptoms of bile dyspepsia resulting from the biliary system. As the bile dyspepsia may induce epigastralgia as with functional dyspepsia and both imaging medical tests and blood tests show normal findings, it is difficult to discriminate it from the FD with only these tests.~Therefore even though the epigastralgia or upper abdominal discomfort met the Rome IV criteria for the FD, the possibility that it, in part was actually resulted from the bile dyspepsia cannot be eliminated.~The CNU capsule is a choleretic used for bile dyspepsia as a complex agent of trihydrated magnesium salt of kenodeoxycholic acid and ursodeoxycholic acid, which are being marketed.~Thus this study intends to perform a therapeutic use clinical study for efficacy and safety on symptom improvement by administrating CNU capsule to the patients with RFD.
Refractory Functional Dyspepsia (FD) means a state that no symptom was improved in spite of appropriate treatment for the FD.~It may be challenging to discriminate the symptoms of FD from the symptoms of bile dyspepsia resulting from the biliary system. As the bile dyspepsia may induce epigastralgia as with functional dyspepsia and both imaging medical tests and blood tests show normal findings, it is difficult to discriminate it from the FD with only these tests.~Thus this study intends to perform a therapeutic use clinical study for efficacy and safety on symptom improvement by administrating CNU capsule to the patients with RFD.