Which statement best informs a client about the combination therapy of spironolactone and furosemide?

Which statement best informs a client about the combination therapy of spironolactone and furosemide?

• A. Moderate doses of two different diuretics are more effective than a large dose of one.
• B. This combination promotes diuresis but decreases the risk of hypokalemia.
• C. This combination prevents dehydration and hypovolemia.
• D. Using two drugs increases the osmolality of plasma and the glomerular filtration rate.

Answer: (B)

Using two diuretics with different mechanisms lets you achieve stronger diuresis while balancing electrolyte effects. Furosemide, a loop diuretic, increases excretion of water, sodium, and potassium, which can lead to hypokalemia. Spironolactone is a potassium-sparing diuretic that blocks aldosterone in the collecting ducts, reducing potassium loss. When used together, you get the loud diuretic effect from the loop drug but the potassium loss is offset by spironolactone, so the overall risk of hypokalemia is decreased. It’s important to monitor potassium levels and kidney function because hyperkalemia can occur with this combination, especially in patients with kidney impairment or those taking other potassium-raising meds. This pairing does not prevent dehydration or improve GFR; diuresis can still reduce fluid volume, and GFR is not specifically increased by this combination.

Using two diuretics with different mechanisms lets you achieve stronger diuresis while balancing electrolyte effects. Furosemide, a loop diuretic, increases excretion of water, sodium, and potassium, which can lead to hypokalemia. Spironolactone is a potassium-sparing diuretic that blocks aldosterone in the collecting ducts, reducing potassium loss. When used together, you get the loud diuretic effect from the loop drug but the potassium loss is offset by spironolactone, so the overall risk of hypokalemia is decreased. It’s important to monitor potassium levels and kidney function because hyperkalemia can occur with this combination, especially in patients with kidney impairment or those taking other potassium-raising meds. This pairing does not prevent dehydration or improve GFR; diuresis can still reduce fluid volume, and GFR is not specifically increased by this combination.