Which adverse effect is most commonly associated with spironolactone use?

Which adverse effect is most commonly associated with spironolactone use?

• A. Hyperkalemia
• B. Hypertension
• C. Hypokalemia
• D. Bradycardia

Answer: (A)

Spironolactone blocks aldosterone receptors in the collecting ducts, reducing sodium reabsorption and, importantly, decreasing potassium secretion into the urine. This potassium-sparing effect leads to elevated serum potassium, so hyperkalemia is the most common adverse effect. This risk is amplified in people with kidney impairment or when combined with other treatments that raise potassium (like ACE inhibitors, ARBs, or potassium supplements), so electrolyte monitoring is important. Other options don’t fit as well: hypertension isn’t an adverse effect—spironolactone can lower blood pressure; hypokalemia would require potassium loss, which this drug does not promote; and bradycardia isn’t a typical direct adverse effect unless hyperkalemia becomes severe.

Spironolactone blocks aldosterone receptors in the collecting ducts, reducing sodium reabsorption and, importantly, decreasing potassium secretion into the urine. This potassium-sparing effect leads to elevated serum potassium, so hyperkalemia is the most common adverse effect.

This risk is amplified in people with kidney impairment or when combined with other treatments that raise potassium (like ACE inhibitors, ARBs, or potassium supplements), so electrolyte monitoring is important. Other options don’t fit as well: hypertension isn’t an adverse effect—spironolactone can lower blood pressure; hypokalemia would require potassium loss, which this drug does not promote; and bradycardia isn’t a typical direct adverse effect unless hyperkalemia becomes severe.