Review Question - QID 213183

A 69-year-old woman is brought to the clinic for difficulty breathing over the past 2 months. She denies any clear precipitating factor but reports that her breathing has become progressively labored and she feels like she can’t breathe. Her past medical history is significant for heart failure, diabetes mellitus, and hypertension. Her medications include lisinopril, metoprolol, and metformin. She is allergic to sulfa drugs and peanuts. A physical examination demonstrates bilateral rales at the lung bases, pitting edema of the lower extremities, and a laterally displaced point of maximal impulse (PMI). She is subsequently given a medication that will reduce her volume status by competitively binding to aldosterone receptors. What is the most likely drug prescribed to this patient?