Drospirenone-containing formulations are associated with which diuretic effect?

• A. Mild potassium-sparing diuretic effect
• B. Potassium-wasting diuretic effect
• C. Loop diuretic effect
• D. No diuretic effect

Answer: (A)

Drospirenone has anti-mineralocorticoid activity, similar to spironolactone, which leads to a mild potassium-sparing diuretic effect. In the kidney, blocking aldosterone receptors in the collecting ducts reduces sodium reabsorption (and thus water retention) while conserving potassium. Because of this mechanism, the diuretic effect is present but mild and tends to spare potassium, rather than causing potassium loss. This differs from potassium-wasting diuretics or loop diuretics, which promote potassium excretion or produce more pronounced diuresis. Clinically, the mild diuretic effect can help with fluid retention, but there’s a risk of hyperkalemia in patients with renal impairment or those taking other potassium-sparing agents.