MCQs for UPSC Drug Inspector, GPAT, NIPER, AIIMS Pharmacist, Railway Pharmacist, SSC, ESIC, and State Pharmacist on Diuretics

Diuretics are an important group of drugs that increase the formation and excretion of urine by the kidneys. They primarily act by reducing the reabsorption of sodium and water from the renal tubules. As a result, diuretics increase the excretion of sodium, water and, depending on the drug, other electrolytes such as potassium, calcium and magnesium. Because of their effects on fluid and electrolyte balance, diuretics are widely used in the treatment of hypertension, edema, heart failure, renal disorders and certain electrolyte abnormalities.

For students preparing for competitive examinations such as UPSC Drug Inspector, GPAT, NIPER, AIIMS Pharmacist, Railway Pharmacist, SSC, ESIC and State Pharmacist, diuretics are a high-yield topic. Questions are commonly asked about their classification, site of action, mechanism, electrolyte effects, therapeutic uses and adverse effects.

Diuretics are broadly classified into carbonic anhydrase inhibitors, osmotic diuretics, loop diuretics, thiazide and thiazide-like diuretics, and potassium-sparing diuretics. Each class acts at a specific part of the nephron. For example, acetazolamide acts mainly in the proximal tubule, furosemide acts on the thick ascending limb of the loop of Henle, hydrochlorothiazide acts on the distal convoluted tubule, while spironolactone and amiloride act mainly in the collecting tubule.

A strong understanding of the nephron is essential for solving conceptual MCQs. Students should particularly remember that loop diuretics increase calcium excretion, whereas thiazides decrease calcium excretion. Loop diuretics may cause hypokalemia and ototoxicity, while potassium-sparing diuretics may cause hyperkalemia. Spironolactone, an aldosterone antagonist, is also associated with gynecomastia.

Thus, learning diuretics through their site of action → mechanism → electrolyte changes → clinical uses → adverse effects provides an effective strategy for answering both direct and tricky questions in pharmacy competitive examinations.

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