Question 1: A 65-year-old patient with chronic kidney disease (Stage 3) is prescribed
apixaban for non-valvular atrial fibrillation. What is the most appropriate dosing
adjustment based on this patient's renal function?
A. No dose adjustment is needed for Stage 3 CKD
B. The dose should be reduced by 50%
C. The medication is contraindicated
D. The dose should be increased by 50%
CORRECT ANSWER: A. No dose adjustment is needed for Stage 3 CKD.
Rationale: Apixaban is a direct oral anticoagulant (DOAC) that is partially renally
cleared. However, it is approved for use in patients with Stage 3 CKD (CrCl 30-59
mL/min) without a dose reduction, unlike dabigatran which requires adjustment. No
dose adjustment is needed.
Question 2: A patient is prescribed a monoamine oxidase inhibitor (MAOI), phenelzine,
for treatment-resistant depression. Which dietary restriction is most critical to prevent a
hypertensive crisis?
A. Avoiding foods high in tyramine
B. Avoiding foods high in tryptophan
C. Avoiding foods high in phenylalanine
D. Avoiding foods high in glutamate
CORRECT ANSWER: A. Avoiding foods high in tyramine.
Rationale: MAOIs block the breakdown of tyramine, an amino acid found in aged
cheeses, cured meats, and fermented foods. A buildup of tyramine leads to a release of
norepinephrine, causing a hypertensive crisis, which can be fatal.
Question 3: A patient on a ventilator in the ICU develops severe agitation. The nurse
practitioner orders a continuous infusion of propofol for sedation. What is the most
important acute adverse e ect to monitor for in this patient?
A. Hypertriglyceridemia
B. Propofol infusion syndrome
C. Pancreatitis
D. Respiratory depression
CORRECT ANSWER: B. Propofol infusion syndrome.
Rationale: Propofol infusion syndrome (PRIS) is a rare but fatal complication
associated with high-dose, prolonged (>48 hours) propofol infusion. It is characterized
,by metabolic acidosis, rhabdomyolysis, hyperkalemia, and cardiac failure. Monitoring
for PRIS is a key safety concern.
Question 4: A patient is prescribed tamoxifen for hormone receptor-positive breast
cancer. The nurse practitioner understands that tamoxifen requires metabolism to its
active form. Which cytochrome P450 (CYP) enzyme is primarily responsible for this
activation?
A. CYP2D6
B. CYP3A4
C. CYP2C19
D. CYP1A2
CORRECT ANSWER: A. CYP2D6.
Rationale: Tamoxifen is a prodrug that is metabolized to its active metabolite,
endoxifen, by the CYP2D6 enzyme. Polymorphisms in CYP2D6 can significantly a ect
the patient's response to tamoxifen, making the patient a poor or intermediate
metabolizer and rendering the drug less e ective.
Question 5: A patient with bipolar disorder is prescribed lithium. The patient's serum
lithium level is 1.2 mEq/L. What is the most appropriate action by the nurse
practitioner?
A. Continue the current dose and monitor
B. Increase the dose to achieve a higher therapeutic level
C. Decrease the dose due to toxicity
D. Hold the dose and order a serum creatinine level
CORRECT ANSWER: A. Continue the current dose and monitor.
Rationale: The therapeutic range for lithium is typically 0.8-1.2 mEq/L for acute
treatment and 0.6-1.0 mEq/L for maintenance. A level of 1.2 mEq/L is at the upper end
of the therapeutic range for acute treatment; monitoring for signs of toxicity is
appropriate while continuing the current dose.
Question 6: A patient is prescribed a tricyclic antidepressant (TCA), amitriptyline, for
neuropathic pain. The nurse practitioner should monitor for which potentially fatal
complication?
A. Serotonin syndrome
B. Cardiac arrhythmias (prolonged QT)
,C. Hepatotoxicity
D. Nephrotoxicity
CORRECT ANSWER: B. Cardiac arrhythmias (prolonged QT).
Rationale: TCAs are notorious for cardiotoxicity, particularly causing a prolonged QT
interval and widening of the QRS complex. This can lead to fatal arrhythmias like
Torsade de Pointes, especially in overdose. An ECG should be monitored.
Question 7: A pregnant patient is diagnosed with a urinary tract infection (UTI). Which
antibiotic should the nurse practitioner avoid prescribing due to the risk of fetal harm?
A. Amoxicillin
B. Cephalexin
C. Nitrofurantoin
D. Ciprofloxacin
CORRECT ANSWER: D. Ciprofloxacin.
Rationale: Ciprofloxacin is a fluoroquinolone. It is generally avoided during pregnancy,
especially in the first trimester, due to its association with arthropathy in juvenile
animals. It is categorized as Pregnancy Category C, while the other options are Category
B.
Question 8: A patient is on a continuous infusion of vancomycin for a methicillin-
resistant Staphylococcus aureus (MRSA) infection. Which serum level is most critical to
monitor to prevent toxicity?
A. Peak vancomycin level
B. Trough vancomycin level
C. Serum creatinine level
D. Both B and C
CORRECT ANSWER: D. Both B and C.
Rationale: Vancomycin trough levels should be monitored to ensure e icacy and
prevent resistance (target 10-20 mcg/mL). Serum creatinine must be monitored
concurrently because vancomycin is nephrotoxic, and renal function significantly
a ects drug clearance.
, Question 9: A patient with heart failure is prescribed a combination of hydralazine and
isosorbide dinitrate (BiDil). This combination is specifically indicated for which patient
population?
A. Caucasian patients with heart failure
B. African American patients with heart failure
C. All patients with heart failure
D. Patients with pulmonary hypertension
CORRECT ANSWER: B. African American patients with heart failure.
Rationale: The combination of hydralazine and isosorbide dinitrate (BiDil) is the first
medication approved specifically for self-identified African American patients with
heart failure. It has shown a significant mortality benefit in this population.
Question 10: A patient is prescribed warfarin and is started on a new antibiotic,
amoxicillin/clavulanate. The international normalized ratio (INR) is drawn 3 days later
and is 5.0. What is the most likely cause?
A. The antibiotic inhibited the metabolism of warfarin
B. The antibiotic altered the gut flora, a ecting vitamin K production
C. The antibiotic enhanced the protein binding of warfarin
D. The patient stopped taking the warfarin
CORRECT ANSWER: B. The antibiotic altered the gut flora, a ecting vitamin K
production.
Rationale: Amoxicillin/clavulanate alters the normal intestinal flora, which reduces the
synthesis of vitamin K by gut bacteria. This leads to a decrease in vitamin K-dependent
clotting factors, thereby potentiating the e ect of warfarin and elevating the INR.
Question 11: A patient is started on clopidogrel (Plavix) after a drug-eluting stent
placement. The nurse practitioner knows that the e icacy of this medication is highly
dependent on:
A. CYP2C19 metabolism
B. CYP3A4 metabolism
C. CYP2D6 metabolism
D. CYP1A2 metabolism
CORRECT ANSWER: A. CYP2C19 metabolism.
Rationale: Clopidogrel is a prodrug that requires two-step activation by CYP2C19. Poor
metabolizers of CYP2C19 have significantly reduced active metabolite levels and are at
apixaban for non-valvular atrial fibrillation. What is the most appropriate dosing
adjustment based on this patient's renal function?
A. No dose adjustment is needed for Stage 3 CKD
B. The dose should be reduced by 50%
C. The medication is contraindicated
D. The dose should be increased by 50%
CORRECT ANSWER: A. No dose adjustment is needed for Stage 3 CKD.
Rationale: Apixaban is a direct oral anticoagulant (DOAC) that is partially renally
cleared. However, it is approved for use in patients with Stage 3 CKD (CrCl 30-59
mL/min) without a dose reduction, unlike dabigatran which requires adjustment. No
dose adjustment is needed.
Question 2: A patient is prescribed a monoamine oxidase inhibitor (MAOI), phenelzine,
for treatment-resistant depression. Which dietary restriction is most critical to prevent a
hypertensive crisis?
A. Avoiding foods high in tyramine
B. Avoiding foods high in tryptophan
C. Avoiding foods high in phenylalanine
D. Avoiding foods high in glutamate
CORRECT ANSWER: A. Avoiding foods high in tyramine.
Rationale: MAOIs block the breakdown of tyramine, an amino acid found in aged
cheeses, cured meats, and fermented foods. A buildup of tyramine leads to a release of
norepinephrine, causing a hypertensive crisis, which can be fatal.
Question 3: A patient on a ventilator in the ICU develops severe agitation. The nurse
practitioner orders a continuous infusion of propofol for sedation. What is the most
important acute adverse e ect to monitor for in this patient?
A. Hypertriglyceridemia
B. Propofol infusion syndrome
C. Pancreatitis
D. Respiratory depression
CORRECT ANSWER: B. Propofol infusion syndrome.
Rationale: Propofol infusion syndrome (PRIS) is a rare but fatal complication
associated with high-dose, prolonged (>48 hours) propofol infusion. It is characterized
,by metabolic acidosis, rhabdomyolysis, hyperkalemia, and cardiac failure. Monitoring
for PRIS is a key safety concern.
Question 4: A patient is prescribed tamoxifen for hormone receptor-positive breast
cancer. The nurse practitioner understands that tamoxifen requires metabolism to its
active form. Which cytochrome P450 (CYP) enzyme is primarily responsible for this
activation?
A. CYP2D6
B. CYP3A4
C. CYP2C19
D. CYP1A2
CORRECT ANSWER: A. CYP2D6.
Rationale: Tamoxifen is a prodrug that is metabolized to its active metabolite,
endoxifen, by the CYP2D6 enzyme. Polymorphisms in CYP2D6 can significantly a ect
the patient's response to tamoxifen, making the patient a poor or intermediate
metabolizer and rendering the drug less e ective.
Question 5: A patient with bipolar disorder is prescribed lithium. The patient's serum
lithium level is 1.2 mEq/L. What is the most appropriate action by the nurse
practitioner?
A. Continue the current dose and monitor
B. Increase the dose to achieve a higher therapeutic level
C. Decrease the dose due to toxicity
D. Hold the dose and order a serum creatinine level
CORRECT ANSWER: A. Continue the current dose and monitor.
Rationale: The therapeutic range for lithium is typically 0.8-1.2 mEq/L for acute
treatment and 0.6-1.0 mEq/L for maintenance. A level of 1.2 mEq/L is at the upper end
of the therapeutic range for acute treatment; monitoring for signs of toxicity is
appropriate while continuing the current dose.
Question 6: A patient is prescribed a tricyclic antidepressant (TCA), amitriptyline, for
neuropathic pain. The nurse practitioner should monitor for which potentially fatal
complication?
A. Serotonin syndrome
B. Cardiac arrhythmias (prolonged QT)
,C. Hepatotoxicity
D. Nephrotoxicity
CORRECT ANSWER: B. Cardiac arrhythmias (prolonged QT).
Rationale: TCAs are notorious for cardiotoxicity, particularly causing a prolonged QT
interval and widening of the QRS complex. This can lead to fatal arrhythmias like
Torsade de Pointes, especially in overdose. An ECG should be monitored.
Question 7: A pregnant patient is diagnosed with a urinary tract infection (UTI). Which
antibiotic should the nurse practitioner avoid prescribing due to the risk of fetal harm?
A. Amoxicillin
B. Cephalexin
C. Nitrofurantoin
D. Ciprofloxacin
CORRECT ANSWER: D. Ciprofloxacin.
Rationale: Ciprofloxacin is a fluoroquinolone. It is generally avoided during pregnancy,
especially in the first trimester, due to its association with arthropathy in juvenile
animals. It is categorized as Pregnancy Category C, while the other options are Category
B.
Question 8: A patient is on a continuous infusion of vancomycin for a methicillin-
resistant Staphylococcus aureus (MRSA) infection. Which serum level is most critical to
monitor to prevent toxicity?
A. Peak vancomycin level
B. Trough vancomycin level
C. Serum creatinine level
D. Both B and C
CORRECT ANSWER: D. Both B and C.
Rationale: Vancomycin trough levels should be monitored to ensure e icacy and
prevent resistance (target 10-20 mcg/mL). Serum creatinine must be monitored
concurrently because vancomycin is nephrotoxic, and renal function significantly
a ects drug clearance.
, Question 9: A patient with heart failure is prescribed a combination of hydralazine and
isosorbide dinitrate (BiDil). This combination is specifically indicated for which patient
population?
A. Caucasian patients with heart failure
B. African American patients with heart failure
C. All patients with heart failure
D. Patients with pulmonary hypertension
CORRECT ANSWER: B. African American patients with heart failure.
Rationale: The combination of hydralazine and isosorbide dinitrate (BiDil) is the first
medication approved specifically for self-identified African American patients with
heart failure. It has shown a significant mortality benefit in this population.
Question 10: A patient is prescribed warfarin and is started on a new antibiotic,
amoxicillin/clavulanate. The international normalized ratio (INR) is drawn 3 days later
and is 5.0. What is the most likely cause?
A. The antibiotic inhibited the metabolism of warfarin
B. The antibiotic altered the gut flora, a ecting vitamin K production
C. The antibiotic enhanced the protein binding of warfarin
D. The patient stopped taking the warfarin
CORRECT ANSWER: B. The antibiotic altered the gut flora, a ecting vitamin K
production.
Rationale: Amoxicillin/clavulanate alters the normal intestinal flora, which reduces the
synthesis of vitamin K by gut bacteria. This leads to a decrease in vitamin K-dependent
clotting factors, thereby potentiating the e ect of warfarin and elevating the INR.
Question 11: A patient is started on clopidogrel (Plavix) after a drug-eluting stent
placement. The nurse practitioner knows that the e icacy of this medication is highly
dependent on:
A. CYP2C19 metabolism
B. CYP3A4 metabolism
C. CYP2D6 metabolism
D. CYP1A2 metabolism
CORRECT ANSWER: A. CYP2C19 metabolism.
Rationale: Clopidogrel is a prodrug that requires two-step activation by CYP2C19. Poor
metabolizers of CYP2C19 have significantly reduced active metabolite levels and are at
