To evaluate the efficacy and safety of JP-1366 20 mg compared to esomeprazole 40 mg in patients with erosive esophagitis

• Inclusion Criteria: Subjects must satisfy all the following criteria.

  1. Male or female, ≥ 19 years of age at the time of obtaining consent

  2. Subjects who had experienced heartburn and regurgitation within 7 days prior to the screening visit, those whose severity and frequency of symptoms fall under the following (1) or (2)

     ⑴ Subjects who have experienced mild or more severe heartburn or regurgitation at least twice a week

     ⑵ Subjects who have experienced moderate or more severe heartburn or regurgitation at least once a week

  3. Endoscopically confirmed grade A or higher erosive esophagitis as defined by †LosAngeles classification within 15 days, prior to randomization

  4. Subjects who fully understand this study and voluntarily signed on the informed consent form

• Exclusion Criteria: Subjects may not satisfy any of the following criteria.

  1. Subjects who can't undergo endoscopy

  2. Medical History

     º Subjects who have warning symptoms of the malignant gastrointestinal tract such as odynophagia, severe dysphagia, bleeding, weight loss, anemia, or bloody stool. (except negative result for malignancy by endoscopy)

     º Subjects with eosinophilic esophagitis (except negative result by esophageal biopsy)

     º Subjects who have esophageal stenosis, gastroesophageal varices, Barrett's esophagus, active gastric ulcer, gastrointestinal bleeding, or malignant tumor confirmed by EGD

     º Zollinger-Ellison syndrome patients

     º Subjects diagnosed with primary esophageal motility disorder, irritable bowel syndrome (IBS), inflammatory bowel disease (IBD), or suspected with IBS in the last 3 months and with a current history of the disease including pancreatitis

     º Subjects who have a history of gastric acid suppression surgery, gastrointestinal or esophageal surgery (except appendectomy, cholecystectomy, polypectomy)

     º Subjects with a history of clinically significant hepatic, renal, cardiovascular, respiratory, endocrine, urinary, neuro-psychiatric, hemato-oncologic disorder

     º Subjects who have a history of malignant tumor in 5 years at the time of screening. However, excluding subjects with malignant gastrointestinal cancer regardless of the period.

  3. Laboratory Test

     Screening laboratory test showing any of the following abnormal laboratory results:

     º ALT or AST > 2.0 x ULN

     º ALP or GGT > 2.0 x ULN

     º Total bilirubin > 2.0 x ULN

     º eGFR<70 mL/min/1.73 m2 (CKD-EPI formula)

     º Positive result for Serological test (HBsAg, HCV Ab, HIV Ab, Syphilis reagin test)

     º Clinically significant ECG abnormalities

  4. Allergy and drug hypersensitivity

     º Known hypersensitivity to the active ingredient or excipients of the investigational product

     º Clinically significant allergies (except mild allergic rhinitis) or hypersensitivity history to drugs. (Aspirin, antibiotics, etc.)

  5. Prohibited medication and therapy

     º Subjects who take gastric acid suppressant like P-CAB, PPI within 2weeks prior to EGD of screening procedure

     º Subjects who take medication (antacids, prokinetics, H2RA, etc.) related to reflux esophagitis more than 2times within 1week prior to EGD of screening procedure

     º Subjects who need to take medication (aspirin, NSAIDs, etc.) that may cause an ulcer, during the study period

     º Subjects who are on or need to be on the medications which categorized as contraindicated in this clinical trial.

     However, subjects who are on the contraindicated medications can participate in the trial after the washout period of 2 weeks. If five times of the half-life of the contraindicated medications exceeds 2 weeks, the washout period will be set as five times of the half-life.

  6. Pregnant and lactating women

  7. Contraception Subjects who do not agree to use medically acceptable methods of contraception during the period study

  8. Subjects with clinically significant psychiatric disorder and a history with a drug and alcohol abuse.

  9. Subjects who are judged unsuitable to participate in the study in the opinion of the investigator