NUR 112 Drug Classification Exam: Comprehensive 200-question test bank covering diuretics,
antihypertensives, anticoagulants, antiplatelets, thrombolytics, cardiac glycosides, antiarrhythmics,
nitrates, and vasodilators. Includes multiple-choice questions with correct answers and detailed
rationales for each. Covers mechanisms of action, adverse effects, drug interactions, nursing
interventions, patient teaching, and laboratory monitoring. Designed for nursing students
preparing for pharmacology exams and NCLEX-RN licensure. Focuses on clinical application,
critical thinking, and safe medication administration in diverse patient populations.
SECTION 1: DIURETICS AND ELECTROLYTE MANAGEMENT (Questions 1-50)
Question 1:
For a patient prescribed hydrochlorothiazide (HCTZ), the nurse should closely monitor which
laboratory test value?
1. Sodium
2. Glucose
3. Calcium
4. Chloride
Correct Answer: 2. Glucose
Rationale: Thiazide and thiazide-like diuretics are associated with adverse metabolic effects of
hyperglycemia; therefore, close monitoring of blood glucose levels is needed. These medications
can impair glucose tolerance by decreasing insulin secretion and increasing insulin resistance.
Other metabolic disturbances include hyperlipidemia and hyperuricemia. While thiazides can also
cause hyponatremia, hypercalcemia, and hypochloremia, the most clinically significant metabolic
effect requiring routine monitoring is hyperglycemia, as it can lead to new-onset diabetes mellitus
or worsen glycemic control in patients with pre-existing diabetes.
Question 2:
pg. 1
,The nurse is providing education to a patient prescribed spironolactone (Aldactone) and
furosemide (Lasix). What information does the nurse explain to the patient?
1. Using two drugs increases blood osmolality and the glomerular filtration rate.
2. This combination promotes diuresis but decreases the risk of low levels of potassium.
3. The lowest dose of two different types of diuretics are more effective than a large dose of one
type.
4. This combination maintains water balance to protect against dehydration and electrolyte
imbalance.
Correct Answer: 2. This combination promotes diuresis but decreases the risk of low levels of
potassium.
Rationale: Spironolactone is a potassium-sparing diuretic; furosemide is a potassium-losing
diuretic. Giving these together minimizes potassium loss while promoting effective diuresis. This
combination therapy allows for synergistic diuretic effects while reducing the risk of hypokalemia
commonly associated with loop diuretics like furosemide. The combination does not significantly
increase blood osmolality or GFR, and while using two different types may be more effective
than a high dose of one, the primary rationale for this specific combination is electrolyte balance,
specifically potassium preservation.
Question 3:
Which laboratory test result is a common adverse effect of furosemide (Lasix)?
1. Hypokalemia
2. Hypernatremia
3. Hyperchloremia
4. Hypophosphatemia
Correct Answer: 1. Hypokalemia
Rationale: Furosemide is a potent loop diuretic, and the most common adverse effect of loop
diuretics is electrolyte imbalances. This results in major electrolyte losses of potassium and sodium
and, to a lesser extent, calcium. Hypokalemia occurs because furosemide inhibits the Na-K-2Cl
cotransporter in the thick ascending limb of the loop of Henle, leading to increased distal delivery
of sodium and subsequent potassium excretion via the sodium-potassium exchange mechanism.
Hypokalemia can lead to cardiac arrhythmias, muscle weakness, and fatigue, making it a critical
adverse effect to monitor.
pg. 2
,Question 4:
Why does the health care provider prescribe furosemide (Lasix) 40 mg twice a day by mouth for
a patient with a history of renal insufficiency?
1. Furosemide is effective in treating patients with hypoadosteronism.
2. Furosemide helps the kidney with reabsorption of sodium and water.
3. Furosemide has an antagonist effect to prevent respiratory alkalosis.
4. Furosemide is effective in treating patients with impaired kidney function.
Correct Answer: 4. Furosemide is effective in treating patients with impaired kidney function.
Rationale: Furosemide effectiveness continues in impaired renal function. When creatinine
clearance decreases below 25 mL/min (normal is 125 mL/min), the loop diuretics can still work
because they reach their site of action (the thick ascending limb) via tubular secretion rather than
glomerular filtration. Unlike thiazide diuretics, which lose efficacy in renal insufficiency, furosemide
maintains its diuretic effect due to its powerful action and ability to be secreted by proximal
tubular cells. Higher doses may be required in renal failure, but the medication remains a
preferred choice for managing fluid overload in these patients.
Question 5:
When preparing to administer intravenous furosemide (Lasix) to a patient with renal dysfunction,
the nurse will administer the medication no faster than which rate?
1. 2 mg/min
2. 4 mg/min
3. 6 mg/min
4. 8 mg/min
Correct Answer: 2. 4 mg/min
Rationale: Furosemide controlled infusion rate should not exceed a rate of 4 mg/min in patients
with renal failure. Rapid administration of IV furosemide can cause ototoxicity, particularly in
patients with renal impairment. The risk of irreversible hearing loss increases with higher doses
and faster infusion rates. For patients with normal renal function, the maximum rate is 20 mg/min,
but in renal failure, this rate must be reduced to prevent accumulation of the drug in the inner ear.
The nurse should always verify the prescriber's order and institutional policy regarding
administration rates for high-alert medications like furosemide.
Question 6:
pg. 3
, A patient asks the nurse about using potassium supplements while taking spironolactone
(Aldactone). What is the nurse's best response?
1. "I will call your health care provider and discuss your concern."
2. "I would recommend that you take two multivitamins every day."
3. "This diuretic is potassium sparing, so there is no need for extra potassium."
4. "You will need to take potassium supplements for the medication to be effective."
Correct Answer: 3. "This diuretic is potassium sparing, so there is no need for extra potassium."
Rationale: Spironolactone is a potassium-sparing diuretic, and thus the patient does not need
potassium supplementation. Intake of excess potassium may lead to hyperkalemia, which can
cause life-threatening cardiac arrhythmias. Spironolactone works by competitively inhibiting
aldosterone receptors in the distal tubule, decreasing sodium reabsorption and potassium
excretion. Patients taking potassium-sparing diuretics should be educated to avoid potassium-rich
foods and salt substitutes containing potassium. If the patient is also taking an ACE inhibitor or
ARB, the risk of hyperkalemia is even greater, requiring close monitoring of serum potassium
levels.
Question 7:
To treat a patient diagnosed with primary hyperaldosteronism, the nurse would expect to
administer which diuretic?
1. Furosemide (Lasix)
2. Acetazolamide (Diamox)
3. Spironolactone (Aldactone)
4. Hydrochlorothiazide (HCTZ)
Correct Answer: 3. Spironolactone (Aldactone)
Rationale: Spironolactone is the direct antagonist for aldosterone. Primary hyperaldosteronism
(Conn's syndrome) is characterized by excessive aldosterone production, leading to sodium
retention, potassium loss, and hypertension. Spironolactone competes with aldosterone for
receptor sites in the distal convoluted tubule, effectively blocking its effects. This results in
increased sodium and water excretion while conserving potassium. Spironolactone is considered
the drug of choice for managing hypertension and electrolyte imbalances associated with
hyperaldosteronism. Furosemide, acetazolamide, and HCTZ do not directly antagonize
aldosterone and would not address the underlying pathophysiology.
pg. 4
antihypertensives, anticoagulants, antiplatelets, thrombolytics, cardiac glycosides, antiarrhythmics,
nitrates, and vasodilators. Includes multiple-choice questions with correct answers and detailed
rationales for each. Covers mechanisms of action, adverse effects, drug interactions, nursing
interventions, patient teaching, and laboratory monitoring. Designed for nursing students
preparing for pharmacology exams and NCLEX-RN licensure. Focuses on clinical application,
critical thinking, and safe medication administration in diverse patient populations.
SECTION 1: DIURETICS AND ELECTROLYTE MANAGEMENT (Questions 1-50)
Question 1:
For a patient prescribed hydrochlorothiazide (HCTZ), the nurse should closely monitor which
laboratory test value?
1. Sodium
2. Glucose
3. Calcium
4. Chloride
Correct Answer: 2. Glucose
Rationale: Thiazide and thiazide-like diuretics are associated with adverse metabolic effects of
hyperglycemia; therefore, close monitoring of blood glucose levels is needed. These medications
can impair glucose tolerance by decreasing insulin secretion and increasing insulin resistance.
Other metabolic disturbances include hyperlipidemia and hyperuricemia. While thiazides can also
cause hyponatremia, hypercalcemia, and hypochloremia, the most clinically significant metabolic
effect requiring routine monitoring is hyperglycemia, as it can lead to new-onset diabetes mellitus
or worsen glycemic control in patients with pre-existing diabetes.
Question 2:
pg. 1
,The nurse is providing education to a patient prescribed spironolactone (Aldactone) and
furosemide (Lasix). What information does the nurse explain to the patient?
1. Using two drugs increases blood osmolality and the glomerular filtration rate.
2. This combination promotes diuresis but decreases the risk of low levels of potassium.
3. The lowest dose of two different types of diuretics are more effective than a large dose of one
type.
4. This combination maintains water balance to protect against dehydration and electrolyte
imbalance.
Correct Answer: 2. This combination promotes diuresis but decreases the risk of low levels of
potassium.
Rationale: Spironolactone is a potassium-sparing diuretic; furosemide is a potassium-losing
diuretic. Giving these together minimizes potassium loss while promoting effective diuresis. This
combination therapy allows for synergistic diuretic effects while reducing the risk of hypokalemia
commonly associated with loop diuretics like furosemide. The combination does not significantly
increase blood osmolality or GFR, and while using two different types may be more effective
than a high dose of one, the primary rationale for this specific combination is electrolyte balance,
specifically potassium preservation.
Question 3:
Which laboratory test result is a common adverse effect of furosemide (Lasix)?
1. Hypokalemia
2. Hypernatremia
3. Hyperchloremia
4. Hypophosphatemia
Correct Answer: 1. Hypokalemia
Rationale: Furosemide is a potent loop diuretic, and the most common adverse effect of loop
diuretics is electrolyte imbalances. This results in major electrolyte losses of potassium and sodium
and, to a lesser extent, calcium. Hypokalemia occurs because furosemide inhibits the Na-K-2Cl
cotransporter in the thick ascending limb of the loop of Henle, leading to increased distal delivery
of sodium and subsequent potassium excretion via the sodium-potassium exchange mechanism.
Hypokalemia can lead to cardiac arrhythmias, muscle weakness, and fatigue, making it a critical
adverse effect to monitor.
pg. 2
,Question 4:
Why does the health care provider prescribe furosemide (Lasix) 40 mg twice a day by mouth for
a patient with a history of renal insufficiency?
1. Furosemide is effective in treating patients with hypoadosteronism.
2. Furosemide helps the kidney with reabsorption of sodium and water.
3. Furosemide has an antagonist effect to prevent respiratory alkalosis.
4. Furosemide is effective in treating patients with impaired kidney function.
Correct Answer: 4. Furosemide is effective in treating patients with impaired kidney function.
Rationale: Furosemide effectiveness continues in impaired renal function. When creatinine
clearance decreases below 25 mL/min (normal is 125 mL/min), the loop diuretics can still work
because they reach their site of action (the thick ascending limb) via tubular secretion rather than
glomerular filtration. Unlike thiazide diuretics, which lose efficacy in renal insufficiency, furosemide
maintains its diuretic effect due to its powerful action and ability to be secreted by proximal
tubular cells. Higher doses may be required in renal failure, but the medication remains a
preferred choice for managing fluid overload in these patients.
Question 5:
When preparing to administer intravenous furosemide (Lasix) to a patient with renal dysfunction,
the nurse will administer the medication no faster than which rate?
1. 2 mg/min
2. 4 mg/min
3. 6 mg/min
4. 8 mg/min
Correct Answer: 2. 4 mg/min
Rationale: Furosemide controlled infusion rate should not exceed a rate of 4 mg/min in patients
with renal failure. Rapid administration of IV furosemide can cause ototoxicity, particularly in
patients with renal impairment. The risk of irreversible hearing loss increases with higher doses
and faster infusion rates. For patients with normal renal function, the maximum rate is 20 mg/min,
but in renal failure, this rate must be reduced to prevent accumulation of the drug in the inner ear.
The nurse should always verify the prescriber's order and institutional policy regarding
administration rates for high-alert medications like furosemide.
Question 6:
pg. 3
, A patient asks the nurse about using potassium supplements while taking spironolactone
(Aldactone). What is the nurse's best response?
1. "I will call your health care provider and discuss your concern."
2. "I would recommend that you take two multivitamins every day."
3. "This diuretic is potassium sparing, so there is no need for extra potassium."
4. "You will need to take potassium supplements for the medication to be effective."
Correct Answer: 3. "This diuretic is potassium sparing, so there is no need for extra potassium."
Rationale: Spironolactone is a potassium-sparing diuretic, and thus the patient does not need
potassium supplementation. Intake of excess potassium may lead to hyperkalemia, which can
cause life-threatening cardiac arrhythmias. Spironolactone works by competitively inhibiting
aldosterone receptors in the distal tubule, decreasing sodium reabsorption and potassium
excretion. Patients taking potassium-sparing diuretics should be educated to avoid potassium-rich
foods and salt substitutes containing potassium. If the patient is also taking an ACE inhibitor or
ARB, the risk of hyperkalemia is even greater, requiring close monitoring of serum potassium
levels.
Question 7:
To treat a patient diagnosed with primary hyperaldosteronism, the nurse would expect to
administer which diuretic?
1. Furosemide (Lasix)
2. Acetazolamide (Diamox)
3. Spironolactone (Aldactone)
4. Hydrochlorothiazide (HCTZ)
Correct Answer: 3. Spironolactone (Aldactone)
Rationale: Spironolactone is the direct antagonist for aldosterone. Primary hyperaldosteronism
(Conn's syndrome) is characterized by excessive aldosterone production, leading to sodium
retention, potassium loss, and hypertension. Spironolactone competes with aldosterone for
receptor sites in the distal convoluted tubule, effectively blocking its effects. This results in
increased sodium and water excretion while conserving potassium. Spironolactone is considered
the drug of choice for managing hypertension and electrolyte imbalances associated with
hyperaldosteronism. Furosemide, acetazolamide, and HCTZ do not directly antagonize
aldosterone and would not address the underlying pathophysiology.
pg. 4
