NUR 635 Advanced Pharmacology Final Exam Prep: High-
Yield Questions, Verified Answers, & Detailed Clinical
Rationales (Updated Edition)
Question 1
A 29-year-old patient who is currently taking carbamazepine for bipolar
disorder requires an antibiotic for a severe skin and soft tissue infection. Which
of the following antibiotics is most likely to cause carbamazepine toxicity by
significantly inhibiting its metabolism?
, A) Amoxicillin
B) Erythromycin
C) Levofloxacin
D) Doxycycline
Answer: B) Erythromycin
Explanation: Erythromycin is a potent inhibitor of the cytochrome P450 3A4
(CYP3A4) enzyme system. Because carbamazepine is primarily metabolized
by CYP3A4, co-administration with erythromycin drastically slows down
carbamazepine clearance. This leads to a rapid elevation of serum drug levels
and subsequent clinical toxicity (such as ataxia, nystagmus, and dizziness).
Amoxicillin, levofloxacin, and doxycycline do not strongly inhibit the
CYP3A4 pathway.
Question 2
An NP is managing a 62-year-old patient with an extensive history of chronic
obstructive pulmonary disease (COPD) who has been diagnosed with a severe
acute exacerbation. Alongside short-acting bronchodilators, which therapy is
considered the standard first-line treatment to accelerate lung function recovery
and reduce hospital stay duration?
A) A 14-day course of high-dose inhaled fluticasone
B) A 5-day course of systemic oral corticosteroids (e.g., prednisone 40 mg
daily)
C) Continuous intravenous aminophylline infusion
D) Long-acting beta-2 agonist (LABA) monotherapy
Answer: B) A 5-day course of systemic oral corticosteroids (e.g., prednisone
40 mg daily)
Explanation: Current GOLD guidelines recommend a short course (typically 5
days) of systemic oral corticosteroids, such as prednisone 40 mg daily, for
acute exacerbations of COPD. Systemic bursts significantly shorten recovery
, time, improve lung function (FEV1), and reduce the risk of early relapse.
Inhaled corticosteroids are insufficient for acute, severe distress.
Aminophylline has a narrow therapeutic index and is no longer preferred.
LABAs are strictly for maintenance therapy, not acute management.
Question 3
A 44-year-old female patient with chronic severe migraines is considering
prophylactic therapy. She has a history of type 1 diabetes mellitus and
moderate-to-severe asthma requiring daily controller medication. Which of the
following prophylactic medications is strictly contraindicated in this individual?
A) Topiramate
B) Propranolol
C) Amitriptyline
D) Valproic acid
Answer: B) Propranolol
Explanation: Propranolol is a non-selective beta-blocker that blocks both beta-
1 and beta-2 adrenergic receptors. Blocking beta-2 receptors in the bronchial
smooth muscle can trigger life-threatening bronchoconstriction and severe
asthma exacerbations. Therefore, non-selective beta-blockers are strictly
contraindicated in patients with reactive airway diseases like asthma or severe
COPD. Topiramate, amitriptyline, and valproic acid do not block bronchial
beta receptors and are safer options regarding respiratory function.
Question 4
A patient presents to the clinic with severe rebound nasal congestion (rhinitis
medicamentosa) after using an over-the-counter nasal spray to treat cold
symptoms. Which of the following medications is the most likely culprit when
used for longer than 3 consecutive days?
A) Fluticasone propionate
B) Azelastine
, C) Phenylephrine nasal spray
D) Cromolyn sodium
Answer: C) Phenylephrine nasal spray
Explanation: Topical nasal decongestants like phenylephrine or oxymetazoline
cause rapid, localized vasoconstriction of the nasal mucosa. If used for more
than 3 to 5 consecutive days, the downregulation of alpha-adrenergic
receptors causes severe rebound swelling and dependency, known as rhinitis
medicamentosa. Intranasal corticosteroids (fluticasone), intranasal
antihistamines (azelastine), and mast cell stabilizers (cromolyn) do not cause
this rebound effect and are often used to treat it.
Question 5
A 68-year-old male with chronic kidney disease (CKD Stage 4, GFR 22
mL/min) is experiencing mild constipation. He self-prescribes an over-the-
counter antacid/laxative combination. He presents to the clinic a week later with
severe muscle weakness, bradycardia, and hypotension. Which electrolyte
toxicity resulting from medication accumulation should the NP suspect?
A) Hypernatremia
B) Hypermagnesemia
C) Hypokalemia
D) Hypercalcemia
Answer: B) Hypermagnesemia
Explanation: Magnesium is primarily excreted via the kidneys. In patients
with severe renal impairment (CKD stages 4 or 5), the clearance of
magnesium is profoundly reduced. Ingesting over-the-counter magnesium-
containing laxatives (like milk of magnesia) or antacids can quickly lead to
toxic serum accumulation. Hypermagnesemia manifests clinically through
neuromuscular depression, diminished deep tendon reflexes, muscle
weakness, bradycardia, and hypotension.
Yield Questions, Verified Answers, & Detailed Clinical
Rationales (Updated Edition)
Question 1
A 29-year-old patient who is currently taking carbamazepine for bipolar
disorder requires an antibiotic for a severe skin and soft tissue infection. Which
of the following antibiotics is most likely to cause carbamazepine toxicity by
significantly inhibiting its metabolism?
, A) Amoxicillin
B) Erythromycin
C) Levofloxacin
D) Doxycycline
Answer: B) Erythromycin
Explanation: Erythromycin is a potent inhibitor of the cytochrome P450 3A4
(CYP3A4) enzyme system. Because carbamazepine is primarily metabolized
by CYP3A4, co-administration with erythromycin drastically slows down
carbamazepine clearance. This leads to a rapid elevation of serum drug levels
and subsequent clinical toxicity (such as ataxia, nystagmus, and dizziness).
Amoxicillin, levofloxacin, and doxycycline do not strongly inhibit the
CYP3A4 pathway.
Question 2
An NP is managing a 62-year-old patient with an extensive history of chronic
obstructive pulmonary disease (COPD) who has been diagnosed with a severe
acute exacerbation. Alongside short-acting bronchodilators, which therapy is
considered the standard first-line treatment to accelerate lung function recovery
and reduce hospital stay duration?
A) A 14-day course of high-dose inhaled fluticasone
B) A 5-day course of systemic oral corticosteroids (e.g., prednisone 40 mg
daily)
C) Continuous intravenous aminophylline infusion
D) Long-acting beta-2 agonist (LABA) monotherapy
Answer: B) A 5-day course of systemic oral corticosteroids (e.g., prednisone
40 mg daily)
Explanation: Current GOLD guidelines recommend a short course (typically 5
days) of systemic oral corticosteroids, such as prednisone 40 mg daily, for
acute exacerbations of COPD. Systemic bursts significantly shorten recovery
, time, improve lung function (FEV1), and reduce the risk of early relapse.
Inhaled corticosteroids are insufficient for acute, severe distress.
Aminophylline has a narrow therapeutic index and is no longer preferred.
LABAs are strictly for maintenance therapy, not acute management.
Question 3
A 44-year-old female patient with chronic severe migraines is considering
prophylactic therapy. She has a history of type 1 diabetes mellitus and
moderate-to-severe asthma requiring daily controller medication. Which of the
following prophylactic medications is strictly contraindicated in this individual?
A) Topiramate
B) Propranolol
C) Amitriptyline
D) Valproic acid
Answer: B) Propranolol
Explanation: Propranolol is a non-selective beta-blocker that blocks both beta-
1 and beta-2 adrenergic receptors. Blocking beta-2 receptors in the bronchial
smooth muscle can trigger life-threatening bronchoconstriction and severe
asthma exacerbations. Therefore, non-selective beta-blockers are strictly
contraindicated in patients with reactive airway diseases like asthma or severe
COPD. Topiramate, amitriptyline, and valproic acid do not block bronchial
beta receptors and are safer options regarding respiratory function.
Question 4
A patient presents to the clinic with severe rebound nasal congestion (rhinitis
medicamentosa) after using an over-the-counter nasal spray to treat cold
symptoms. Which of the following medications is the most likely culprit when
used for longer than 3 consecutive days?
A) Fluticasone propionate
B) Azelastine
, C) Phenylephrine nasal spray
D) Cromolyn sodium
Answer: C) Phenylephrine nasal spray
Explanation: Topical nasal decongestants like phenylephrine or oxymetazoline
cause rapid, localized vasoconstriction of the nasal mucosa. If used for more
than 3 to 5 consecutive days, the downregulation of alpha-adrenergic
receptors causes severe rebound swelling and dependency, known as rhinitis
medicamentosa. Intranasal corticosteroids (fluticasone), intranasal
antihistamines (azelastine), and mast cell stabilizers (cromolyn) do not cause
this rebound effect and are often used to treat it.
Question 5
A 68-year-old male with chronic kidney disease (CKD Stage 4, GFR 22
mL/min) is experiencing mild constipation. He self-prescribes an over-the-
counter antacid/laxative combination. He presents to the clinic a week later with
severe muscle weakness, bradycardia, and hypotension. Which electrolyte
toxicity resulting from medication accumulation should the NP suspect?
A) Hypernatremia
B) Hypermagnesemia
C) Hypokalemia
D) Hypercalcemia
Answer: B) Hypermagnesemia
Explanation: Magnesium is primarily excreted via the kidneys. In patients
with severe renal impairment (CKD stages 4 or 5), the clearance of
magnesium is profoundly reduced. Ingesting over-the-counter magnesium-
containing laxatives (like milk of magnesia) or antacids can quickly lead to
toxic serum accumulation. Hypermagnesemia manifests clinically through
neuromuscular depression, diminished deep tendon reflexes, muscle
weakness, bradycardia, and hypotension.
