Inclusion Criteria:  Patients whose serum potassium value (local) at the Run-in period baseline is ≥5.5mEq/L, < 6.5 mEq/L Age 20 - 80 years old at informed consent Patients who understand an overview of the study and voluntarily consented to participate in the study by documents.  Main Exclusion Criteria:  Patients determined to require emergency treatment for hyperkalemia at the Run-in period baseline Patients with poorly controlled blood pressure Patients with heart failure in New York Heart Association Class IV Patients who have experienced heart transplant, liver transplant or kidney transplant or who are predicted that the need for them will occur during the study  Patients who have taken any of the following medication within 7 days prior to the Run-in period baseline or currently administrated.  Sodium polystyrene sulfonate Calcium polystyrene sulfonate Sodium zirconium cyclosilicate hydrate Potassium supplement Patients with or who have experienced a severe swallowing disorder, moderate to severe gastroparesis, severe constipation, bowel obstruction, incarceration, abnormal post-operative bowel motility disorders or severe gastrointestinal disorders. In addition, patients who have experienced bariatric surgery or major gastrointestinal surgery (e.g., bowel resection). Patients suspected to be with transient high potassium value.(ex. caused by dietary effects only)