A patient with hyperkalemia should avoid which medication?

Eplerenone is a mineralocorticoid receptor antagonist that is primarily used for conditions such as hypertension and heart failure. It works by promoting sodium excretion while retaining potassium, making it particularly effective for managing fluid overload. However, in patients with hyperkalemia, the use of eplerenone poses a significant risk because it can further elevate potassium levels in the blood.

Patients who already have elevated potassium should avoid medications that can exacerbate this condition, as high potassium levels can lead to serious cardiac complications. Therefore, prescribing eplerenone to someone with hyperkalemia is contraindicated, as it would potentially worsen their potassium imbalance and increase the risk of life-threatening arrhythmias.