Gastroesophageal Reflux Disease (GERD) is a chronic condition in which stomach acid flows back into the esophagus, causing irritation and inflammation. GERD is categorized into Nonerosive Reflux Disease (NERD), Erosive Esophagitis (EE), and Barrett's esophagus (BE). Common symptoms include heartburn and acid regurgitation. Lifestyle factors such as smoking, obesity, and Helicobacter pylori infection can increase the risk of developing GERD. The clinical management of GERD typically involves Proton Pump Inhibitors (PPIs) therapy, which, although effective, may not benefit all patients and can be associated with long-term risks. The American College of Gastroenterology (ACG) suggests PPIs discontinuation or on-demand therapy for uncomplicated GERD after an 8-week trial. However, evidence indicates that PPIs are used more frequently, often long-term and in high doses, and not necessarily according to recommendations. Moreover, the availability of Over-The-Counter (OTC) PPIs has led to prolonged use by patients without medical guidance. Concerns have been raised due to potential side effects of long-term PPIs use, including enteric, respiratory, and urinary tract infections, as well as an increased risk of vitamin and mineral deficiencies and osteoporosis.

Alternatives to PPIs include Histamine-2 Receptor Antagonists (H2RAs), antacids and alginate-based formulations. Among OTC treatments, medical devices formulated with natural components are also gaining attention for their potential performance and tolerability in managing mild to moderate GERD symptoms. These alternatives could address the unmet needs of NERD patients, especially those with a low response to PPIs treatment and provide an option without the potential side effects of prolonged PPIs use. Afluxin® is a class III medical device, containing functional substances (tamarind seed polysaccharide, pea protein and polyacrylic acid), formulated for the treatment of mild to moderate GERD. Preclinical data have shown that Afluxin® is able to create a protective barrier over the gastroesophageal epithelium, preventing reflux damage. In vitro studies suggest that Afluxin® effectively binds to the esophageal and gastric mucosa, reducing abnormal permeability caused by acid reflux. Moreover, in vivo evidence shows that Afluxin® can increase gastric pH, reduce epigastric pain, esophageal damage, and inflammatory markers associated with GERD. Given the encouraging results obtained in preclinical investigations, this study is designed to provide clinical evidence to support the performance and safety of Afluxin® in reducing gastrointestinal symptoms of patients with mild to moderate GERD in a multicenter, randomized, double-blind, parallel-group, Afluxin® stick pack vs. inactive control clinical investigation.

Inclusion Criteria:

1. Male and female patients, aged ≥ 18 years and ≤ 75 years.
2. Evidence of symptomatic GERD: patients with ongoing heartburn and/or regurgitation (with or without dyspepsia symptoms of epigastric pain and/or burning) of at least mild to moderate severity or experienced during the least 7 days before starting the treatment, as assessed on a clinical basis by the Investigator.
3. Patients not pre-treated with PPIs, even for problems different from GERD (e.g., gastroprotection, PPI-based triple or quadruple therapy for eradication of H. pylori), H2RAs, and/or with antiacids, alginates or medical devices made of substances (i.e., substance-based medical devices to treat GERD, gastroesophageal reflux and similar conditions) in the last week prior to screening.
4. Patient has provided written informed consent after being informed of the study procedures and risks prior to any study-related events.
5. Patients are able to understand and adhere to the study procedures.
6. Females of childbearing potential must have a negative urine pregnancy test (dipstick) at Visit 1 and currently use or agree to use consistently and correctly (i.e., perfect use) a highly effective or acceptable effective contraceptive method for the individual subject and her partner(s) throughout the study treatment period.

Exclusion Criteria:

1. Patient with hypersensitivity to any Afluxin® or inactive control components.

2. Rhinosinusitis or bronchitis.

3. Patients with a:

   1. history and/or
   2. symptom profile and/or
   3. discovered on endoscopy suggestive of the following: any other Gastrointestinal (GI) disease, erosive GERD, BE, acute peptic ulcer and/or ulcer complications, hiatus hernia with a diameter which exceeds 3 cm, Zollinger-Ellison syndrome, esophageal or gastric cancer, pyloric stenosis, esophageal or gastric surgery, intestinal obstruction, current pernicious anemia, indication for H. pylori eradication therapy, known gastro-intestinal bleeding (hematochezia or hematemesis) within the last 12 months.

4. Patients diagnosed with functional dyspepsia characterized by postprandial distress syndrome (i.e., bothersome postprandial fullness and/or early satiation).

5. Patients with a history of gastro-esophageal surgery, anti-reflux, or bariatric procedure.

6. Presence of any active malignancy (except for non-invasive basal or squamous cell carcinoma of the skin).

7. Patients using any drug that could affect symptoms or affecting the gastrointestinal tract during the last week prior to screening:

   1. prokinetics
   2. systemic glucocorticosteroids
   3. Non-Steroidal Anti-Inflammatory Drugs (NSAIDs)

8. Patients who are pregnant or lactating.

9. Patients who are enrolled in or have participated in other clinical trials or investigations within 30 days prior to screening.

10. Clinically significant or unstable concurrent diseases whose sequelae or treatment might contraindicate study participation or interfere with the study evaluation parameters, as judged by the Investigator.