NR 565 ADVANCED PHARMACOLOGY FUNDAMENTALS
(PDF) | 2026 EXAM QUESTIONS AND ANSWERS +
RATIONALES | STUDY GUIDE | 100% CORRECT
1. Which of the following drug schedules has the highest potential for abuse and no
currently accepted medical use in the United States?
A) Schedule I
B) Schedule II
C) Schedule III
D) Schedule IV
Correct Answer: Schedule I
Rationale: Schedule I substances are defined as having a high potential for abuse, no currently
accepted medical use in treatment in the United States, and a lack of accepted safety for use
under medical supervision. Examples include heroin, LSD, and marijuana (cannabis). Schedule
II, III, and IV substances all have accepted medical uses with varying abuse potentials and
dependence liabilities.
2. Which cytochrome P450 enzyme family is responsible for metabolizing the largest
percentage of clinically used drugs?
A) CYP1
B) CYP2
C) CYP3
D) CYP4
Correct Answer: CYP3
Rationale: The CYP3 family, specifically CYP3A4, is responsible for metabolizing
approximately 50% of all clinically used drugs. It is the most abundant CYP enzyme in the liver
and intestine. While CYP1 and CYP2 families also metabolize drugs, they account for a smaller
percentage of total drug metabolism.
3. A patient taking warfarin is started on carbamazepine for seizures. The nurse anticipates
which effect on warfarin levels?
A) Increased warfarin levels and bleeding risk
B) Decreased warfarin levels and reduced anticoagulant effect
C) No change in warfarin levels
D) Increased warfarin levels but reduced effect
Correct Answer: Decreased warfarin levels and reduced anticoagulant effect
Rationale: Carbamazepine is a potent inducer of hepatic drug-metabolizing enzymes, including
CYP3A4. This induction increases the rate of warfarin metabolism, leading to decreased
warfarin levels and reduced anticoagulant effect. Monitoring INR and adjusting the warfarin
dose is essential to maintain therapeutic anticoagulation.
, 4. Grapefruit juice inhibits intestinal CYP3A4. Which effect would this have on a
medication that is a CYP3A4 substrate?
A) Decreased drug absorption
B) Increased drug bioavailability and risk of toxicity
C) No significant change in drug levels
D) Accelerated drug clearance
Correct Answer: Increased drug bioavailability and risk of toxicity
Rationale: Grapefruit juice inhibits CYP3A4 in the intestinal wall, decreasing first-pass
metabolism of drugs that are CYP3A4 substrates. This inhibition leads to increased
bioavailability and higher systemic drug concentrations, which can result in toxicity. This
interaction is particularly significant for medications like certain statins, calcium channel
blockers, and immunosuppressants.
5. Which statement correctly describes the difference between drug inducers and inhibitors
of the CYP450 system?
A) Inducers decrease drug metabolism; inhibitors increase drug metabolism
B) Inducers increase drug metabolism; inhibitors decrease drug metabolism
C) Both inducers and inhibitors decrease drug metabolism
D) Both inducers and inhibitors increase drug metabolism
Correct Answer: Inducers increase drug metabolism; inhibitors decrease drug metabolism
Rationale: CYP450 inducers increase the synthesis of hepatic enzymes, accelerating drug
metabolism and reducing plasma drug levels, potentially leading to therapeutic failure. CYP450
inhibitors slow drug metabolism, causing accumulation of active drug and increasing the risk of
adverse effects and toxicity. Common inducers include carbamazepine, rifampin, and phenytoin;
common inhibitors include ketoconazole, amiodarone, and erythromycin.
6. A provider is considering prescribing rosuvastatin for a patient of Asian descent. What
special consideration is needed?
A) Higher starting dose is recommended
B) Lower starting dose is recommended due to reduced metabolism
C) No dose adjustment is needed based on ethnicity
D) The drug is contraindicated in all Asian patients
Correct Answer: Lower starting dose is recommended due to reduced metabolism
Rationale: Rosuvastatin reaches abnormally high levels in people of Asian heritage due to
genetic polymorphisms affecting drug transporters, with levels about twice those in White
patients at usual therapeutic doses. Therefore, when rosuvastatin is used in Asian patients, the
dosage should be reduced. This is because Asians lack certain CYP450 enzyme variants that
affect the metabolism of some statins.
7. What is the mechanism of action of thiazide diuretics?
A) Blocking aldosterone receptors in the collecting duct
, B) Inhibiting Na+/K+/2Cl- cotransport in the loop of Henle
C) Blocking the thiazide-sensitive Na+/Cl- symporter in the distal convoluted tubule
D) Osmotic retention of water in the proximal tubule
Correct Answer: Blocking the thiazide-sensitive Na+/Cl- symporter in the distal convoluted
tubule
Rationale: Thiazide diuretics prevent sodium reabsorption by blocking the thiazide-sensitive
Na+/Cl- symporter in the distal convoluted tubule of the kidney. This action increases excretion
of sodium, chloride, potassium, and water, reducing blood volume and venous pressure. Loop
diuretics work in the loop of Henle, and potassium-sparing diuretics affect aldosterone or sodium
channels.
8. A patient is started on lisinopril and develops a persistent dry cough. Which medication
class would be an appropriate alternative for hypertension management?
A) Thiazide diuretic
B) Angiotensin II receptor blocker (ARB)
C) Beta-blocker
D) Direct renin inhibitor
Correct Answer: Angiotensin II receptor blocker (ARB)
Rationale: ACE inhibitors like lisinopril can cause a dry cough due to increased bradykinin
levels from ACE inhibition. ARBs do not affect bradykinin metabolism and therefore do not
cause this cough, making them a suitable alternative. ARBs share the "-sartan" suffix and have
similar benefits to ACE inhibitors for hypertension and heart failure without the cough side
effect.
9. What is the mechanism of action of ACE inhibitors in treating hypertension?
A) Blocking angiotensin II receptors
B) Reducing levels of angiotensin II through inhibition of ACE and increasing bradykinin
levels
C) Blocking calcium channels in vascular smooth muscle
D) Reducing sympathetic outflow from the central nervous system
Correct Answer: Reducing levels of angiotensin II through inhibition of ACE and increasing
bradykinin levels
Rationale: ACE inhibitors block the angiotensin-converting enzyme (ACE), reducing the
conversion of angiotensin I to angiotensin II and thereby lowering blood pressure. They also
increase bradykinin levels by inhibiting kinase II, which contributes to vasodilation but can also
cause side effects like cough and angioedema. ARBs block angiotensin II receptors directly,
providing a different mechanism of action.
10. For which patient population are ACE inhibitors considered superior to calcium channel
blockers?
A) African American patients with hypertension
, B) Patients with hypertensive nephrosclerosis
C) Patients with type 2 diabetes without proteinuria
D) Young adults with prehypertension
Correct Answer: Patients with hypertensive nephrosclerosis
Rationale: ACE inhibitors are superior to calcium channel blockers in patients with hypertensive
nephrosclerosis due to their renoprotective effects. In African American patients with
hypertension, ACE inhibitors as monotherapy are generally less effective than thiazides or
calcium channel blockers. ACE inhibitors are particularly beneficial in patients with type 1
diabetes and proteinuria due to their renal protective effects.
11. A provider is treating a pregnant patient with hypertension. Which antihypertensive
agents are considered traditional first-line options for safety during pregnancy?
A) ACE inhibitors
B) ARBs
C) Methyldopa and labetalol
D) Thiazide diuretics
Correct Answer: Methyldopa and labetalol
Rationale: When drug therapy is initiated during pregnancy for hypertension, methyldopa and
labetalol are the traditional agents of choice due to their established safety profiles. ACE
inhibitors, ARBs, and direct renin inhibitors are contraindicated during pregnancy due to
potential fetal harm including growth delay, congenital malformations, and neonatal renal
failure. These agents are Category C in the first trimester and Category D in the second and third
trimesters.
12. A patient with heart failure is prescribed digoxin. The nurse explains that the primary
therapeutic benefit of this medication is:
A) Increasing heart rate
B) Decreasing myocardial contractile force
C) Increasing myocardial contractile force (positive inotropic effect)
D) Reducing preload through diuresis
Correct Answer: Increasing myocardial contractile force (positive inotropic effect)
Rationale: Digoxin is a cardiac glycoside best known for its positive inotropic action—the ability
to increase myocardial contractile force. By increasing contractile force, digoxin can increase
cardiac output, which is beneficial in heart failure. Digoxin also alters the electrical activity of
the heart and can favorably affect neurohormonal systems.
13. A patient is prescribed quinidine and digoxin concurrently. What potential drug
interaction should the nurse monitor?
A) Decreased digoxin levels leading to therapeutic failure
B) Increased digoxin levels leading to digoxin toxicity
(PDF) | 2026 EXAM QUESTIONS AND ANSWERS +
RATIONALES | STUDY GUIDE | 100% CORRECT
1. Which of the following drug schedules has the highest potential for abuse and no
currently accepted medical use in the United States?
A) Schedule I
B) Schedule II
C) Schedule III
D) Schedule IV
Correct Answer: Schedule I
Rationale: Schedule I substances are defined as having a high potential for abuse, no currently
accepted medical use in treatment in the United States, and a lack of accepted safety for use
under medical supervision. Examples include heroin, LSD, and marijuana (cannabis). Schedule
II, III, and IV substances all have accepted medical uses with varying abuse potentials and
dependence liabilities.
2. Which cytochrome P450 enzyme family is responsible for metabolizing the largest
percentage of clinically used drugs?
A) CYP1
B) CYP2
C) CYP3
D) CYP4
Correct Answer: CYP3
Rationale: The CYP3 family, specifically CYP3A4, is responsible for metabolizing
approximately 50% of all clinically used drugs. It is the most abundant CYP enzyme in the liver
and intestine. While CYP1 and CYP2 families also metabolize drugs, they account for a smaller
percentage of total drug metabolism.
3. A patient taking warfarin is started on carbamazepine for seizures. The nurse anticipates
which effect on warfarin levels?
A) Increased warfarin levels and bleeding risk
B) Decreased warfarin levels and reduced anticoagulant effect
C) No change in warfarin levels
D) Increased warfarin levels but reduced effect
Correct Answer: Decreased warfarin levels and reduced anticoagulant effect
Rationale: Carbamazepine is a potent inducer of hepatic drug-metabolizing enzymes, including
CYP3A4. This induction increases the rate of warfarin metabolism, leading to decreased
warfarin levels and reduced anticoagulant effect. Monitoring INR and adjusting the warfarin
dose is essential to maintain therapeutic anticoagulation.
, 4. Grapefruit juice inhibits intestinal CYP3A4. Which effect would this have on a
medication that is a CYP3A4 substrate?
A) Decreased drug absorption
B) Increased drug bioavailability and risk of toxicity
C) No significant change in drug levels
D) Accelerated drug clearance
Correct Answer: Increased drug bioavailability and risk of toxicity
Rationale: Grapefruit juice inhibits CYP3A4 in the intestinal wall, decreasing first-pass
metabolism of drugs that are CYP3A4 substrates. This inhibition leads to increased
bioavailability and higher systemic drug concentrations, which can result in toxicity. This
interaction is particularly significant for medications like certain statins, calcium channel
blockers, and immunosuppressants.
5. Which statement correctly describes the difference between drug inducers and inhibitors
of the CYP450 system?
A) Inducers decrease drug metabolism; inhibitors increase drug metabolism
B) Inducers increase drug metabolism; inhibitors decrease drug metabolism
C) Both inducers and inhibitors decrease drug metabolism
D) Both inducers and inhibitors increase drug metabolism
Correct Answer: Inducers increase drug metabolism; inhibitors decrease drug metabolism
Rationale: CYP450 inducers increase the synthesis of hepatic enzymes, accelerating drug
metabolism and reducing plasma drug levels, potentially leading to therapeutic failure. CYP450
inhibitors slow drug metabolism, causing accumulation of active drug and increasing the risk of
adverse effects and toxicity. Common inducers include carbamazepine, rifampin, and phenytoin;
common inhibitors include ketoconazole, amiodarone, and erythromycin.
6. A provider is considering prescribing rosuvastatin for a patient of Asian descent. What
special consideration is needed?
A) Higher starting dose is recommended
B) Lower starting dose is recommended due to reduced metabolism
C) No dose adjustment is needed based on ethnicity
D) The drug is contraindicated in all Asian patients
Correct Answer: Lower starting dose is recommended due to reduced metabolism
Rationale: Rosuvastatin reaches abnormally high levels in people of Asian heritage due to
genetic polymorphisms affecting drug transporters, with levels about twice those in White
patients at usual therapeutic doses. Therefore, when rosuvastatin is used in Asian patients, the
dosage should be reduced. This is because Asians lack certain CYP450 enzyme variants that
affect the metabolism of some statins.
7. What is the mechanism of action of thiazide diuretics?
A) Blocking aldosterone receptors in the collecting duct
, B) Inhibiting Na+/K+/2Cl- cotransport in the loop of Henle
C) Blocking the thiazide-sensitive Na+/Cl- symporter in the distal convoluted tubule
D) Osmotic retention of water in the proximal tubule
Correct Answer: Blocking the thiazide-sensitive Na+/Cl- symporter in the distal convoluted
tubule
Rationale: Thiazide diuretics prevent sodium reabsorption by blocking the thiazide-sensitive
Na+/Cl- symporter in the distal convoluted tubule of the kidney. This action increases excretion
of sodium, chloride, potassium, and water, reducing blood volume and venous pressure. Loop
diuretics work in the loop of Henle, and potassium-sparing diuretics affect aldosterone or sodium
channels.
8. A patient is started on lisinopril and develops a persistent dry cough. Which medication
class would be an appropriate alternative for hypertension management?
A) Thiazide diuretic
B) Angiotensin II receptor blocker (ARB)
C) Beta-blocker
D) Direct renin inhibitor
Correct Answer: Angiotensin II receptor blocker (ARB)
Rationale: ACE inhibitors like lisinopril can cause a dry cough due to increased bradykinin
levels from ACE inhibition. ARBs do not affect bradykinin metabolism and therefore do not
cause this cough, making them a suitable alternative. ARBs share the "-sartan" suffix and have
similar benefits to ACE inhibitors for hypertension and heart failure without the cough side
effect.
9. What is the mechanism of action of ACE inhibitors in treating hypertension?
A) Blocking angiotensin II receptors
B) Reducing levels of angiotensin II through inhibition of ACE and increasing bradykinin
levels
C) Blocking calcium channels in vascular smooth muscle
D) Reducing sympathetic outflow from the central nervous system
Correct Answer: Reducing levels of angiotensin II through inhibition of ACE and increasing
bradykinin levels
Rationale: ACE inhibitors block the angiotensin-converting enzyme (ACE), reducing the
conversion of angiotensin I to angiotensin II and thereby lowering blood pressure. They also
increase bradykinin levels by inhibiting kinase II, which contributes to vasodilation but can also
cause side effects like cough and angioedema. ARBs block angiotensin II receptors directly,
providing a different mechanism of action.
10. For which patient population are ACE inhibitors considered superior to calcium channel
blockers?
A) African American patients with hypertension
, B) Patients with hypertensive nephrosclerosis
C) Patients with type 2 diabetes without proteinuria
D) Young adults with prehypertension
Correct Answer: Patients with hypertensive nephrosclerosis
Rationale: ACE inhibitors are superior to calcium channel blockers in patients with hypertensive
nephrosclerosis due to their renoprotective effects. In African American patients with
hypertension, ACE inhibitors as monotherapy are generally less effective than thiazides or
calcium channel blockers. ACE inhibitors are particularly beneficial in patients with type 1
diabetes and proteinuria due to their renal protective effects.
11. A provider is treating a pregnant patient with hypertension. Which antihypertensive
agents are considered traditional first-line options for safety during pregnancy?
A) ACE inhibitors
B) ARBs
C) Methyldopa and labetalol
D) Thiazide diuretics
Correct Answer: Methyldopa and labetalol
Rationale: When drug therapy is initiated during pregnancy for hypertension, methyldopa and
labetalol are the traditional agents of choice due to their established safety profiles. ACE
inhibitors, ARBs, and direct renin inhibitors are contraindicated during pregnancy due to
potential fetal harm including growth delay, congenital malformations, and neonatal renal
failure. These agents are Category C in the first trimester and Category D in the second and third
trimesters.
12. A patient with heart failure is prescribed digoxin. The nurse explains that the primary
therapeutic benefit of this medication is:
A) Increasing heart rate
B) Decreasing myocardial contractile force
C) Increasing myocardial contractile force (positive inotropic effect)
D) Reducing preload through diuresis
Correct Answer: Increasing myocardial contractile force (positive inotropic effect)
Rationale: Digoxin is a cardiac glycoside best known for its positive inotropic action—the ability
to increase myocardial contractile force. By increasing contractile force, digoxin can increase
cardiac output, which is beneficial in heart failure. Digoxin also alters the electrical activity of
the heart and can favorably affect neurohormonal systems.
13. A patient is prescribed quinidine and digoxin concurrently. What potential drug
interaction should the nurse monitor?
A) Decreased digoxin levels leading to therapeutic failure
B) Increased digoxin levels leading to digoxin toxicity
