Which medication is a potassium sparing diuretic?
a. Acetazolamide (Diamox)
b. Spironolactone (Aldactone)
c. Furosemide (Lasix)
d. Bumetanide (Bumex)
ANS: B
Spironolactone is a potassium sparing diuretic that blocks the sodium retaining and potassium and magnesium excreting properties of aldosterone. This results in loss of water, with increased sodium excretion and retention of potassium. Acetazolamide is a carbonic anhydrase inhibitor and does not spare potassium. Furosemide is a loop diuretic. Bumetanide is a loop diuretic and does not spare potassium.
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