Budesonide as a Treatment for Functional Dyspepsia

Inclusion Criteria: 1. Patients with Functional dyspepsia (subtype postprandial distress syndrome) as per Rome IV diagnostic criteria * Symptom characteristics of dyspepsia (upper gastrointestinal symptoms occurring in the last 3 months and meal related) * Negative endoscopy (maximum 12 months old) 2. Patients must provide witnessed written informed consent prior to any study procedures being performed 3. Patients aged between 18 and 70 years inclusive 4. Male or female patients 5. Women of child-bearing potential agree to apply a highly effective method of birth control during the entire duration of the trial. Highly effective birth control is defined as those which result in a low failure rate (i.e., less than 1% per year) when used constantly and correctly such as implants, injectables, combined oral contraceptive method, or some intrauterine devices (IUDs), sexual abstinence, or vasectomized partner. Women of non-childbearing potential may be included if surgically sterile (tubal ligation or hysterectomy) or postmenopausal with at least 2 year without spontaneous menses 6. Subjects who are capable to understand the study and the questionnaires, and to comply with the study requirements Exclusion Criteria: 1. Patients with any condition which, in the opinion of the investigator, makes the patient unsuitable for entry into the study 2. Patients with any major psychiatric disorders (including those with a major psychosomatic element to their gastrointestinal disease), depression, alcohol or substance abuse in the last 2 years 3. Patients presenting with predominant symptoms of irritable bowel syndrome (IBS) or of gastro-esophageal reflux disease (GERD) 4. Presence of diabetes mellitus, celiac disease (diagnosed with presence of anti-tissue transglutaminase antibodies and anti-gliadin antibodies or via duodenal biopsies), lupus, scleroderma or other systemic auto-immune disease 5. Patients with eosinophilic esophagitis or eosinophilic gastroenteritis 6. Active H. Pylori infection (or \< 6 months after eradication) 7. Organic gastro-intestinal disease of history of gastrointestinal surgery other than appendectomy 8. Known impaired liver dysfunction 9. Drugs altering gastric emptying, anti-inflammatory drugs, acid suppressive drugs or some drugs altering the CYP3A4 metabolism 10. Major change in diet last 3 months 11. Females who are pregnant or lactating 12. Patients not capable to understand or be compliant with the study