Bumetanide (Bumex) is used primarily to treat which condition?

• A. Hypertension
• B. Heart failure to diurese
• C. Pulmonary edema due to COPD
• D. Renal failure due to nephrotoxic drugs

Answer: (B)

Loop diuretics like bumetanide are used to relieve fluid overload quickly. They act on the thick ascending limb of the loop of Henle to block the Na-K-2Cl cotransporter, which causes sodium, chloride, and water to be excreted in the urine. This diuresis reduces preload and pulmonary congestion, making them especially effective for edema and shortness of breath in heart failure.

In this scenario, the primary use of bumetanide is to diurese for heart failure with fluid overload and edema. While diuretics can lower blood pressure, bumetanide is not the typical first-line choice for essential hypertension. Pulmonary edema related to COPD isn’t the usual context for initiating this drug, and renal failure from nephrotoxic drugs isn’t the primary indication either—the key point is fluid overload from heart failure.