A 30–year-old male, Rajinder presents to OPD with fatigue, muscle weakness, and headache. His blood pressure is 170/120 mmHg and his heart rate is 100/min. Laboratory evaluation reveals hypokalemia, metabolic alkalosis and decreased plasma renin activity. On CT scan, a mass was noted on the left suprarenal gland. The patient was prescribed a drug for a few weeks and the symptoms subsided. Laboratory values and blood pressure returned to normal values. The likely drug given to this patient is?