Merypat Sachet contains Calcium Polystyrene Sulphonate 15gm, an ion-exchange resin used primarily for the treatment of hyperkalemia, a condition characterized by elevated potassium levels in the blood. This medication works by exchanging calcium ions for potassium ions in the gastrointestinal tract, thereby facilitating the removal of excess potassium through fecal excretion. Merypat is indicated for patients with chronic kidney disease, renal failure, or other conditions that predispose to hyperkalemia, helping to prevent potentially life-threatening cardiac arrhythmias associated with high serum potassium levels. The sachet formulation allows for convenient oral administration, typically dissolved in water before ingestion. Dosage and duration of treatment should be individualized based on serum potassium levels and clinical response, under the guidance of a healthcare professional. Common side effects may include gastrointestinal disturbances such as constipation, nausea, or mild abdominal discomfort. It is contraindicated in patients with hypocalcemia, bowel obstruction, or known hypersensitivity to the active ingredient. Caution is advised when used concomitantly with other medications that affect electrolyte balance. Regular monitoring of serum electrolytes is essential during therapy to avoid complications such as hypokalemia or hypercalcemia. Merypat Sachet is a valuable therapeutic agent in managing hyperkalemia and maintaining electrolyte homeostasis.