NR565 TEST BANK NR565 ADVANCED
PHARMACOLOGY FULLY COVERED
QUESTIONS AND ANSWERS WITH BROAD
RATIONALES /GRADED A+ 2026/2027 NEW
Versions
1. A 58-year-old male with hypertension and type 2 diabetes is started on lisinopril.
Which of the following is the primary mechanism of action of this medication?
A. Inhibits aldosterone secretion directly
B. Blocks beta-adrenergic receptors in the heart
C. Prevents conversion of angiotensin I to angiotensin II
D. Increases sodium reabsorption in the distal tubule
Rationale:
Lisinopril, an ACE inhibitor, prevents the conversion of angiotensin I to angiotensin II,
leading to vasodilation, decreased aldosterone secretion, and reduced blood pressure. Option
A is incorrect because ACE inhibitors act upstream, not directly on aldosterone. Option B
describes beta-blockers. Option D is the opposite of the drug’s action; ACE inhibitors
promote sodium excretion.
2. A patient with atrial fibrillation is prescribed warfarin. Which lab test must be
monitored regularly to ensure therapeutic dosing?
A. aPTT
B. INR
,C. Platelet count
D. Fibrinogen
Rationale:
Warfarin’s anticoagulant effect is monitored using the International Normalized Ratio (INR).
The therapeutic range is typically 2.0–3.0. aPTT is used for heparin therapy. Platelet count
and fibrinogen are unrelated to warfarin’s mechanism of action.
3. A 25-year-old woman using combined oral contraceptives is prescribed an antibiotic
for acne. Which antibiotic can reduce the contraceptive’s effectiveness?
A. Rifampin
B. Amoxicillin
C. Azithromycin
D. Doxycycline
Rationale:
Rifampin is a strong hepatic enzyme inducer that increases metabolism of estrogen and
progesterone, reducing contraceptive efficacy. Other antibiotics generally don’t have this
effect.
4. A 40-year-old with chronic asthma is on albuterol and reports hand tremors and
palpitations. Which mechanism explains this effect?
A. Alpha-1 receptor activation
B. Beta-2 receptor stimulation causing some beta-1 crossover
C. Cholinergic blockade
D. Inhibition of norepinephrine reuptake
Rationale:
Albuterol is a selective beta-2 agonist, but at higher doses, it can stimulate beta-1 receptors in
the heart, causing tachycardia and tremors.
5. In type 2 diabetes, which drug increases insulin sensitivity in peripheral tissues but
carries a risk of heart failure?
A. Metformin
B. Pioglitazone
C. Sitagliptin
D. Glipizide
, Rationale:
Pioglitazone, a thiazolidinedione, enhances insulin sensitivity but can cause fluid retention,
leading to or worsening heart failure. Metformin is first-line but contraindicated in renal
dysfunction, not heart failure.
6. Which antibiotic class inhibits bacterial protein synthesis by binding to the 30S
ribosomal subunit?
A. Macrolides
B. Fluoroquinolones
C. Aminoglycosides
D. Beta-lactams
Rationale:
Aminoglycosides (e.g., gentamicin) act on the 30S subunit, disrupting bacterial protein
synthesis. Macrolides target the 50S subunit, fluoroquinolones inhibit DNA gyrase, and beta-
lactams interfere with cell wall synthesis.
7. A patient on digoxin presents with nausea, visual changes, and irregular pulse.
Which electrolyte imbalance can precipitate digoxin toxicity?
A. Hypokalemia
B. Hypernatremia
C. Hypocalcemia
D. Hypermagnesemia
Rationale:
Low potassium enhances digoxin binding to its receptor in cardiac tissue, increasing the risk
of toxicity. Electrolyte monitoring is crucial, especially if the patient is also taking diuretics.
8. A 32-year-old female treated with isotretinoin for severe acne must be advised about
which critical precaution?
A. Avoid dairy products
B. Take the medication with vitamin C
C. Strict pregnancy prevention due to teratogenicity
D. Avoid sunlight due to severe photosensitivity
Rationale:
Isotretinoin is highly teratogenic; pregnancy must be avoided during and for at least one
month after therapy. It is dispensed under a REMS program.
PHARMACOLOGY FULLY COVERED
QUESTIONS AND ANSWERS WITH BROAD
RATIONALES /GRADED A+ 2026/2027 NEW
Versions
1. A 58-year-old male with hypertension and type 2 diabetes is started on lisinopril.
Which of the following is the primary mechanism of action of this medication?
A. Inhibits aldosterone secretion directly
B. Blocks beta-adrenergic receptors in the heart
C. Prevents conversion of angiotensin I to angiotensin II
D. Increases sodium reabsorption in the distal tubule
Rationale:
Lisinopril, an ACE inhibitor, prevents the conversion of angiotensin I to angiotensin II,
leading to vasodilation, decreased aldosterone secretion, and reduced blood pressure. Option
A is incorrect because ACE inhibitors act upstream, not directly on aldosterone. Option B
describes beta-blockers. Option D is the opposite of the drug’s action; ACE inhibitors
promote sodium excretion.
2. A patient with atrial fibrillation is prescribed warfarin. Which lab test must be
monitored regularly to ensure therapeutic dosing?
A. aPTT
B. INR
,C. Platelet count
D. Fibrinogen
Rationale:
Warfarin’s anticoagulant effect is monitored using the International Normalized Ratio (INR).
The therapeutic range is typically 2.0–3.0. aPTT is used for heparin therapy. Platelet count
and fibrinogen are unrelated to warfarin’s mechanism of action.
3. A 25-year-old woman using combined oral contraceptives is prescribed an antibiotic
for acne. Which antibiotic can reduce the contraceptive’s effectiveness?
A. Rifampin
B. Amoxicillin
C. Azithromycin
D. Doxycycline
Rationale:
Rifampin is a strong hepatic enzyme inducer that increases metabolism of estrogen and
progesterone, reducing contraceptive efficacy. Other antibiotics generally don’t have this
effect.
4. A 40-year-old with chronic asthma is on albuterol and reports hand tremors and
palpitations. Which mechanism explains this effect?
A. Alpha-1 receptor activation
B. Beta-2 receptor stimulation causing some beta-1 crossover
C. Cholinergic blockade
D. Inhibition of norepinephrine reuptake
Rationale:
Albuterol is a selective beta-2 agonist, but at higher doses, it can stimulate beta-1 receptors in
the heart, causing tachycardia and tremors.
5. In type 2 diabetes, which drug increases insulin sensitivity in peripheral tissues but
carries a risk of heart failure?
A. Metformin
B. Pioglitazone
C. Sitagliptin
D. Glipizide
, Rationale:
Pioglitazone, a thiazolidinedione, enhances insulin sensitivity but can cause fluid retention,
leading to or worsening heart failure. Metformin is first-line but contraindicated in renal
dysfunction, not heart failure.
6. Which antibiotic class inhibits bacterial protein synthesis by binding to the 30S
ribosomal subunit?
A. Macrolides
B. Fluoroquinolones
C. Aminoglycosides
D. Beta-lactams
Rationale:
Aminoglycosides (e.g., gentamicin) act on the 30S subunit, disrupting bacterial protein
synthesis. Macrolides target the 50S subunit, fluoroquinolones inhibit DNA gyrase, and beta-
lactams interfere with cell wall synthesis.
7. A patient on digoxin presents with nausea, visual changes, and irregular pulse.
Which electrolyte imbalance can precipitate digoxin toxicity?
A. Hypokalemia
B. Hypernatremia
C. Hypocalcemia
D. Hypermagnesemia
Rationale:
Low potassium enhances digoxin binding to its receptor in cardiac tissue, increasing the risk
of toxicity. Electrolyte monitoring is crucial, especially if the patient is also taking diuretics.
8. A 32-year-old female treated with isotretinoin for severe acne must be advised about
which critical precaution?
A. Avoid dairy products
B. Take the medication with vitamin C
C. Strict pregnancy prevention due to teratogenicity
D. Avoid sunlight due to severe photosensitivity
Rationale:
Isotretinoin is highly teratogenic; pregnancy must be avoided during and for at least one
month after therapy. It is dispensed under a REMS program.
