Calcium Resonium is a medication primarily used in the treatment of hyperkalemia, a condition characterized by elevated levels of potassium in the blood. It functions as a cation exchange resin, which means it works by exchanging calcium ions for potassium ions in the intestines, thereby facilitating the removal of excess potassium from the body through feces. This mechanism helps in preventing the potentially life-threatening complications associated with high potassium levels, such as cardiac arrhythmias. Calcium Resonium is administered orally or rectally, depending on the patient's condition and the severity of hyperkalemia. It is important for patients to follow their healthcare provider's instructions closely when using this medication due to its specific action and the critical balance of electrolytes it affects.