n = number of prescriptions; % = percentage; HTN = hypertension; DHP-CCB = dihydropyridine-calcium channel blocker; RAS = renin-angiotensin system; ACEI = angiotensin‐converting enzyme inhibitor; ARB = angiotensin receptor blocker; TZD = thiazide; IHD = ischemic heart disease; CHF = congestive heart failure. The gene discussed is ACE; the disease is congestive heart failure.