Explanation
• Triamterene is a potassium-sparing diuretic and can cause hyperkalemia, which can result in fatal cardiac arrhythmias
• Triamterene is potassium-sparing, so it would not cause potassium to be lower (hypokalemia)
• Triamterene does not affect calcium, so hypocalcemia and hypercalcemia would not be common metabolic abnormalities