KAPLAN PHARMACOLOGY EXAM PREDICTION 2026 Q&A
1. A patient with chronic kidney disease (CKD) stage 4 is
prescribed digoxin for heart failure. Which pharmacokinetic
change is most critical for the nurse to consider when
administering this medication?
A. Increased oral bioavailability due to decreased first-pass
metabolism
B. Decreased protein binding leading to increased free drug
concentration
C. Reduced renal clearance resulting in drug accumulation
and toxicity risk
D. Enhanced hepatic metabolism compensating for
decreased renal function
Correct Answer: C
Explanation: Digoxin is primarily eliminated by renal
excretion (60-80%). In CKD stage 4, reduced renal
clearance leads to drug accumulation and increased toxicity
risk. Options A, B, and D are incorrect because digoxin has
minimal hepatic metabolism, insignificant protein binding,
and bioavailability is not primarily affected by kidney
disease.
2. A 65-year-old patient receiving warfarin for deep vein
thrombosis presents with an INR of 5.8. The patient has also
started taking gemfibrizol for hyperlipidemia. What is the
mechanism of this drug interaction?
A. Gemfibrizol inhibits CYP2C9, decreasing warfarin
metabolism and increasing anticoagulant effect
, B. Gemfibrizol induces CYP3A4, increasing warfarin
metabolism and decreasing anticoagulant effect
C. Gemfibrizol competes for renal tubular secretion,
increasing warfarin elimination
D. Gemfibrizol enhances warfarin gastrointestinal
absorption through P-glycoprotein inhibition
Correct Answer: A
Explanation: Gemfibrizol inhibits CYP2C9 (the primary
enzyme metabolizing warfarin's more potent S-
enantiomer), decreasing warfarin clearance and increasing
INR/toxicity risk. Option B is wrong because gemfibrizol
doesn't induce CYP3A4. Options C and D are incorrect as
warfarin elimination is hepatic, not renal, and P-gp
inhibition is not the primary mechanism.
3. In a patient with severe asthma experiencing an acute
exacerbation, which medication combination provides the
most rapid bronchodilation while also addressing underlying
inflammation?
A. Inhaled corticosteroid alone
B. Long-acting beta-agonist (LABA) alone
C. Short-acting beta-agonist (SABA) plus inhaled
corticosteroid
D. Anticholinergic agent plus long-acting muscarinic
antagonist
Correct Answer: C
Explanation: SABA (e.g., albuterol) provides immediate
bronchodilation within 5 minutes for acute relief, while
inhaled corticosteroids address underlying inflammation.
Option A provides only inflammation control without rapid
bronchodilation. Option B is for maintenance, not acute
relief. Option D is inappropriate for acute exacerbations.
, 4. A patient with atrial fibrillation is prescribed amiodarone.
Which serious adverse effect requires the most vigilant
monitoring due to its irreversible nature?
A. Hepatotoxicity
B. Pulmonary fibrosis
C. QT interval prolongation
D. Bradycardia
Correct Answer: B
Explanation: Pulmonary fibrosis is amiodarone's most
serious adverse effect and can be irreversible, occurring in
5-15% of patients. It requires monitoring with chest X-rays
and pulmonary function tests. Options A, C, and D are
reversible with dose adjustment or discontinuation.
5. When administering IV vancomycin for methicillin-resistant
Staphylococcus aureus (MRSA) infection, which monitoring
parameter is most critical to prevent adverse effects?
A. Serum creatinine every 24 hours
B. Vancomycin trough levels before the next dose
C. White blood cell count daily
D. Liver function tests twice weekly
Correct Answer: B
Explanation: Vancomycin trough levels (15-20 μg/mL for
serious infections) must be monitored to prevent
nephrotoxicity and ensure therapeutic efficacy. While
serum creatinine (A) is important, trough levels are more
specific for vancomycin dosing. Options C and D are not
primary monitoring parameters for vancomycin.
1. A patient with chronic kidney disease (CKD) stage 4 is
prescribed digoxin for heart failure. Which pharmacokinetic
change is most critical for the nurse to consider when
administering this medication?
A. Increased oral bioavailability due to decreased first-pass
metabolism
B. Decreased protein binding leading to increased free drug
concentration
C. Reduced renal clearance resulting in drug accumulation
and toxicity risk
D. Enhanced hepatic metabolism compensating for
decreased renal function
Correct Answer: C
Explanation: Digoxin is primarily eliminated by renal
excretion (60-80%). In CKD stage 4, reduced renal
clearance leads to drug accumulation and increased toxicity
risk. Options A, B, and D are incorrect because digoxin has
minimal hepatic metabolism, insignificant protein binding,
and bioavailability is not primarily affected by kidney
disease.
2. A 65-year-old patient receiving warfarin for deep vein
thrombosis presents with an INR of 5.8. The patient has also
started taking gemfibrizol for hyperlipidemia. What is the
mechanism of this drug interaction?
A. Gemfibrizol inhibits CYP2C9, decreasing warfarin
metabolism and increasing anticoagulant effect
, B. Gemfibrizol induces CYP3A4, increasing warfarin
metabolism and decreasing anticoagulant effect
C. Gemfibrizol competes for renal tubular secretion,
increasing warfarin elimination
D. Gemfibrizol enhances warfarin gastrointestinal
absorption through P-glycoprotein inhibition
Correct Answer: A
Explanation: Gemfibrizol inhibits CYP2C9 (the primary
enzyme metabolizing warfarin's more potent S-
enantiomer), decreasing warfarin clearance and increasing
INR/toxicity risk. Option B is wrong because gemfibrizol
doesn't induce CYP3A4. Options C and D are incorrect as
warfarin elimination is hepatic, not renal, and P-gp
inhibition is not the primary mechanism.
3. In a patient with severe asthma experiencing an acute
exacerbation, which medication combination provides the
most rapid bronchodilation while also addressing underlying
inflammation?
A. Inhaled corticosteroid alone
B. Long-acting beta-agonist (LABA) alone
C. Short-acting beta-agonist (SABA) plus inhaled
corticosteroid
D. Anticholinergic agent plus long-acting muscarinic
antagonist
Correct Answer: C
Explanation: SABA (e.g., albuterol) provides immediate
bronchodilation within 5 minutes for acute relief, while
inhaled corticosteroids address underlying inflammation.
Option A provides only inflammation control without rapid
bronchodilation. Option B is for maintenance, not acute
relief. Option D is inappropriate for acute exacerbations.
, 4. A patient with atrial fibrillation is prescribed amiodarone.
Which serious adverse effect requires the most vigilant
monitoring due to its irreversible nature?
A. Hepatotoxicity
B. Pulmonary fibrosis
C. QT interval prolongation
D. Bradycardia
Correct Answer: B
Explanation: Pulmonary fibrosis is amiodarone's most
serious adverse effect and can be irreversible, occurring in
5-15% of patients. It requires monitoring with chest X-rays
and pulmonary function tests. Options A, C, and D are
reversible with dose adjustment or discontinuation.
5. When administering IV vancomycin for methicillin-resistant
Staphylococcus aureus (MRSA) infection, which monitoring
parameter is most critical to prevent adverse effects?
A. Serum creatinine every 24 hours
B. Vancomycin trough levels before the next dose
C. White blood cell count daily
D. Liver function tests twice weekly
Correct Answer: B
Explanation: Vancomycin trough levels (15-20 μg/mL for
serious infections) must be monitored to prevent
nephrotoxicity and ensure therapeutic efficacy. While
serum creatinine (A) is important, trough levels are more
specific for vancomycin dosing. Options C and D are not
primary monitoring parameters for vancomycin.
