Which listed medication is a diuretic?

• A. Furosemide
• B. Losartan
• C. Ferrous sulfate
• D. Epoetin alfa

Answer: (A)

Diuretics promote urine production to remove excess fluid from the body. Furosemide is a loop diuretic, acting on the ascending loop of Henle to inhibit the Na+-K+-2Cl- cotransporter. This prevents reabsorption of sodium, chloride, and water, leading to increased urine output and reduced fluid overload. It’s a potent diuretic commonly used to treat edema and heart failure.

Because it causes rapid fluid loss, it can lead to electrolyte imbalances (like low potassium), dehydration, and changes in blood pressure, so monitor electrolytes, blood pressure, and renal function. The other medications listed do not primarily act as diuretics: losartan is an angiotensin II receptor blocker, ferrous sulfate is an iron supplement, and epoetin alfa stimulates red blood cell production.