Pharmacology Exam 2
(chamberlain) 278 questions,
correct answers and rationales for a
guaranteed pass from latest update
2026
This document covers core drug classifications, mechanisms of action, major adverse effects,
nursing implications, and pharmacokinetics across the autonomic nervous system,
cardiovascular agents, renal drugs, central nervous system medications, and endocrine
therapies.
QUESTION: What is the primary therapeutic mechanism of action of bethanechol (Urecholine)
when administered for postoperative urinary retention? ANSWER: Direct stimulation of
muscarinic cholinergic receptors. RATIONALE: Bethanechol is a parasympathomimetic that
mimics acetylcholine, causing contraction of the detrusor muscle of the bladder and relaxation of
the trigone and sphincter to promote urination.
QUESTION: Which specific anticholinergic medication is frequently administered
preoperatively to reduce salivary and bronchial secretions and prevent bradycardia? ANSWER:
Atropine. RATIONALE: Atropine is a competitive antagonist of muscarinic receptors, blocking
parasympathetic nerve impulses to dry secretions and accelerate heart rate.
QUESTION: What dangerous adverse effect must a nurse monitor for in a patient receiving high
doses of an anticholinergic drug like oxybutynin (Ditropan)? ANSWER: Urinary retention and
acute angle-closure glaucoma. RATIONALE: Anticholinergic drugs block parasympathetic
stimulation, leading to smooth muscle relaxation and sphincter constriction that can trap urine
and block aqueous humor outflow.
QUESTION: Which depolarizing neuromuscular blocker is used primarily for rapid-sequence
endotracheal intubation due to its ultra-short duration of action? ANSWER: Succinylcholine
(Anectine). RATIONALE: Succinylcholine mimics acetylcholine at the neuromuscular junction,
persistently depolarizing the motor end plate to cause flaccid paralysis.
,QUESTION: What life-threatening genetic adverse effect is triggered by succinylcholine and
volatile general anesthetics, characterized by severe rigidity and hyperthermia? ANSWER:
Malignant hyperthermia. RATIONALE: Malignant hyperthermia involves uncontrolled release
of intracellular calcium from the sarcoplasmic reticulum, treated immediately with dantrolene
sodium.
QUESTION: Which non-depolarizing neuromuscular blocking agent is eliminated via Hofmann
elimination (spontaneous chemical degradation in plasma), making it ideal for patients with renal
or hepatic failure? ANSWER: Cisatracurium (Nimbex). RATIONALE: Cisatracurium undergoes
organ-independent degradation at physiological body temperature and pH, reducing drug
accumulation risks.
QUESTION: What is the primary therapeutic indication for administering epinephrine during an
acute anaphylactic reaction? ANSWER: Alpha-1 vasoconstriction and beta-2 bronchodilation.
RATIONALE: Epinephrine reverses life-threatening hypotension and airway edema by
stimulating alpha receptors to constrict blood vessels and beta-2 receptors to open airways.
QUESTION: Why is it clinically critical to inspect the intravenous site frequently when infusing
high doses of norepinephrine (Levophed)? ANSWER: Risk of severe extravasation leading to
tissue necrosis and sloughing. RATIONALE: Norepinephrine causes intense local alpha-1-
mediated vasoconstriction; if it infiltrates surrounding tissue, cellular hypoxia and necrosis occur.
QUESTION: What specific antidote is infiltrated subcutaneously into an area of norepinephrine
extravasation to prevent tissue necrosis? ANSWER: Phentolamine (Regitine). RATIONALE:
Phentolamine is an alpha-adrenergic antagonist that rapidly dilates blood vessels in the affected
area, restoring perfusion.
QUESTION: Which selective beta-1 adrenergic antagonist (beta-blocker) is commonly
prescribed for patients with heart failure and hypertension due to its cardioselective profile?
ANSWER: Metoprolol (Lopressor / Toprol XL). RATIONALE: Metoprolol selectively blocks
beta-1 receptors in the heart, decreasing heart rate, myocardial contractility, and cardiac output
without causing immediate bronchoconstriction.
QUESTION: Why must non-selective beta-blockers like propranolol (Inderal) be used with
extreme caution in patients with asthma or chronic obstructive pulmonary disease (COPD)?
ANSWER: Blockade of beta-2 receptors causes severe bronchoconstriction. RATIONALE: Non-
selective beta-blockers inhibit bronchial smooth muscle relaxation mediated by beta-2 receptors,
precipitating acute bronchospasm.
QUESTION: What severe adverse cardiac effect can occur if a patient abruptly stops taking a
chronic beta-blocker prescription? ANSWER: Rebound hypertension, tachycardia, and
myocardial ischemia. RATIONALE: Chronic beta-blocker therapy upregulates beta-adrenergic
receptors; sudden withdrawal floods the heart with catecholamines, potentially triggering angina
or myocardial infarction.
,QUESTION: What is the primary mechanism of action of alpha-1 adrenergic blockers such as
tamsulosin (Flomax) in treating benign prostatic hyperplasia (BPH)? ANSWER: Relaxation of
smooth muscle in the bladder neck and prostate gland. RATIONALE: Blocking alpha-1 receptors
decreases dynamic urethral resistance, improving urine flow rates in men with BPH.
QUESTION: Which class of antihypertensive drugs blocks the conversion of angiotensin I to
angiotensin II, resulting in vasodilation and decreased aldosterone secretion? ANSWER:
Angiotensin-Converting Enzyme (ACE) inhibitors (e.g., lisinopril). RATIONALE: ACE
inhibitors prevent the formation of potent vasoconstrictor angiotensin II and reduce aldosterone-
mediated sodium and water retention.
QUESTION: What characteristic, persistent adverse effect frequently prompts patients to
discontinue ACE inhibitor therapy? ANSWER: Dry, hacking, nonproductive cough.
RATIONALE: ACE inhibitors inhibit the breakdown of bradykinin in the lungs; accumulated
bradykinin irritates sensory nerve endings, causing a nagging cough.
QUESTION: What life-threatening airway emergency can occur within hours or days of starting
an ACE inhibitor like enalapril? ANSWER: Angioedema. RATIONALE: Accumulation of
bradykinin and inflammatory mediators can cause profound, rapid swelling of the lips, tongue,
glottis, and larynx, threatening airway patency.
QUESTION: Which class of drugs shares similar cardiovascular benefits to ACE inhibitors but
directly blocks angiotensin II AT1 receptors, typically without causing a dry cough? ANSWER:
Angiotensin II Receptor Blockers (ARBs, e.g., losartan). RATIONALE: ARBs block the binding
of angiotensin II to tissue receptors downstream, preventing vasoconstriction and aldosterone
release without increasing bradykinin levels.
QUESTION: What severe electrolyte imbalance must a nurse monitor for when administering
potassium-sparing diuretics (such as spironolactone) alongside ACE inhibitors or ARBs?
ANSWER: Hyperkalemia. RATIONALE: Both drug classes reduce aldosterone activity or renal
potassium excretion, predisposing the patient to dangerously high serum potassium levels.
QUESTION: What is the primary mechanism of action of direct renin inhibitors like aliskiren
(Tekturna)? ANSWER: Binding directly to renin to inhibit the conversion of angiotensinogen to
angiotensin I. RATIONALE: Aliskiren halts the renin-angiotensin-aldosterone system (RAAS) at
its very inception, lowering blood pressure.
QUESTION: Which class of antihypertensive medications prevents calcium ions from entering
vascular smooth muscle and cardiac cells, causing coronary and peripheral vasodilation?
ANSWER: Calcium Channel Blockers (CCBs, e.g., amlodipine, diltiazem). RATIONALE:
Blocking voltage-gated calcium channels reduces intracellular calcium, preventing muscle
contraction and promoting vascular smooth muscle relaxation.
, QUESTION: Why should grapefruit juice be strictly avoided by patients taking certain calcium
channel blockers (such as nifedipine or verapamil)? ANSWER: Inhibition of CYP3A4
metabolism leading to toxic drug accumulation. RATIONALE: Furanocoumarins in grapefruit
juice inhibit intestinal cytochrome P450 3A4 enzymes, drastically increasing drug bioavailability
and risking severe hypotension.
QUESTION: Which centrally acting alpha-2 agonist is utilized for hypertension and attention-
deficit/hyperactivity disorder (ADHD), working by reducing sympathetic outflow from the
central nervous system? ANSWER: Clonidine (Catapres). RATIONALE: Clonidine stimulates
alpha-2 receptors in the brainstem, suppressing sympathetic nervous system activity to lower
heart rate and blood pressure.
QUESTION: What dangerous rebound phenomenon occurs if clonidine is abruptly discontinued?
ANSWER: Severe hypertensive crisis. RATIONALE: Sudden withdrawal of central sympathetic
suppression results in a massive surge of catecholamines, causing dangerous rebound
hypertension and tachycardia.
QUESTION: What is the primary hemodynamic effect of direct-acting vasodilators like
hydralazine? ANSWER: Relaxation of arterial smooth muscle with minimal effect on veins.
RATIONALE: Hydralazine directly dilates resistance arterioles, reducing afterload; reflex
tachycardia often occurs due to baroreceptor activation.
QUESTION: Which loop diuretic is frequently prescribed for acute pulmonary edema and severe
heart failure due to its high potency in the ascending limb of the loop of Henle? ANSWER:
Furosemide (Lasix). RATIONALE: Furosemide inhibits the sodium-potassium-2 chloride (
𝑁
𝑎
+
−
𝐾
+
−
2
𝐶
𝑙
−
(chamberlain) 278 questions,
correct answers and rationales for a
guaranteed pass from latest update
2026
This document covers core drug classifications, mechanisms of action, major adverse effects,
nursing implications, and pharmacokinetics across the autonomic nervous system,
cardiovascular agents, renal drugs, central nervous system medications, and endocrine
therapies.
QUESTION: What is the primary therapeutic mechanism of action of bethanechol (Urecholine)
when administered for postoperative urinary retention? ANSWER: Direct stimulation of
muscarinic cholinergic receptors. RATIONALE: Bethanechol is a parasympathomimetic that
mimics acetylcholine, causing contraction of the detrusor muscle of the bladder and relaxation of
the trigone and sphincter to promote urination.
QUESTION: Which specific anticholinergic medication is frequently administered
preoperatively to reduce salivary and bronchial secretions and prevent bradycardia? ANSWER:
Atropine. RATIONALE: Atropine is a competitive antagonist of muscarinic receptors, blocking
parasympathetic nerve impulses to dry secretions and accelerate heart rate.
QUESTION: What dangerous adverse effect must a nurse monitor for in a patient receiving high
doses of an anticholinergic drug like oxybutynin (Ditropan)? ANSWER: Urinary retention and
acute angle-closure glaucoma. RATIONALE: Anticholinergic drugs block parasympathetic
stimulation, leading to smooth muscle relaxation and sphincter constriction that can trap urine
and block aqueous humor outflow.
QUESTION: Which depolarizing neuromuscular blocker is used primarily for rapid-sequence
endotracheal intubation due to its ultra-short duration of action? ANSWER: Succinylcholine
(Anectine). RATIONALE: Succinylcholine mimics acetylcholine at the neuromuscular junction,
persistently depolarizing the motor end plate to cause flaccid paralysis.
,QUESTION: What life-threatening genetic adverse effect is triggered by succinylcholine and
volatile general anesthetics, characterized by severe rigidity and hyperthermia? ANSWER:
Malignant hyperthermia. RATIONALE: Malignant hyperthermia involves uncontrolled release
of intracellular calcium from the sarcoplasmic reticulum, treated immediately with dantrolene
sodium.
QUESTION: Which non-depolarizing neuromuscular blocking agent is eliminated via Hofmann
elimination (spontaneous chemical degradation in plasma), making it ideal for patients with renal
or hepatic failure? ANSWER: Cisatracurium (Nimbex). RATIONALE: Cisatracurium undergoes
organ-independent degradation at physiological body temperature and pH, reducing drug
accumulation risks.
QUESTION: What is the primary therapeutic indication for administering epinephrine during an
acute anaphylactic reaction? ANSWER: Alpha-1 vasoconstriction and beta-2 bronchodilation.
RATIONALE: Epinephrine reverses life-threatening hypotension and airway edema by
stimulating alpha receptors to constrict blood vessels and beta-2 receptors to open airways.
QUESTION: Why is it clinically critical to inspect the intravenous site frequently when infusing
high doses of norepinephrine (Levophed)? ANSWER: Risk of severe extravasation leading to
tissue necrosis and sloughing. RATIONALE: Norepinephrine causes intense local alpha-1-
mediated vasoconstriction; if it infiltrates surrounding tissue, cellular hypoxia and necrosis occur.
QUESTION: What specific antidote is infiltrated subcutaneously into an area of norepinephrine
extravasation to prevent tissue necrosis? ANSWER: Phentolamine (Regitine). RATIONALE:
Phentolamine is an alpha-adrenergic antagonist that rapidly dilates blood vessels in the affected
area, restoring perfusion.
QUESTION: Which selective beta-1 adrenergic antagonist (beta-blocker) is commonly
prescribed for patients with heart failure and hypertension due to its cardioselective profile?
ANSWER: Metoprolol (Lopressor / Toprol XL). RATIONALE: Metoprolol selectively blocks
beta-1 receptors in the heart, decreasing heart rate, myocardial contractility, and cardiac output
without causing immediate bronchoconstriction.
QUESTION: Why must non-selective beta-blockers like propranolol (Inderal) be used with
extreme caution in patients with asthma or chronic obstructive pulmonary disease (COPD)?
ANSWER: Blockade of beta-2 receptors causes severe bronchoconstriction. RATIONALE: Non-
selective beta-blockers inhibit bronchial smooth muscle relaxation mediated by beta-2 receptors,
precipitating acute bronchospasm.
QUESTION: What severe adverse cardiac effect can occur if a patient abruptly stops taking a
chronic beta-blocker prescription? ANSWER: Rebound hypertension, tachycardia, and
myocardial ischemia. RATIONALE: Chronic beta-blocker therapy upregulates beta-adrenergic
receptors; sudden withdrawal floods the heart with catecholamines, potentially triggering angina
or myocardial infarction.
,QUESTION: What is the primary mechanism of action of alpha-1 adrenergic blockers such as
tamsulosin (Flomax) in treating benign prostatic hyperplasia (BPH)? ANSWER: Relaxation of
smooth muscle in the bladder neck and prostate gland. RATIONALE: Blocking alpha-1 receptors
decreases dynamic urethral resistance, improving urine flow rates in men with BPH.
QUESTION: Which class of antihypertensive drugs blocks the conversion of angiotensin I to
angiotensin II, resulting in vasodilation and decreased aldosterone secretion? ANSWER:
Angiotensin-Converting Enzyme (ACE) inhibitors (e.g., lisinopril). RATIONALE: ACE
inhibitors prevent the formation of potent vasoconstrictor angiotensin II and reduce aldosterone-
mediated sodium and water retention.
QUESTION: What characteristic, persistent adverse effect frequently prompts patients to
discontinue ACE inhibitor therapy? ANSWER: Dry, hacking, nonproductive cough.
RATIONALE: ACE inhibitors inhibit the breakdown of bradykinin in the lungs; accumulated
bradykinin irritates sensory nerve endings, causing a nagging cough.
QUESTION: What life-threatening airway emergency can occur within hours or days of starting
an ACE inhibitor like enalapril? ANSWER: Angioedema. RATIONALE: Accumulation of
bradykinin and inflammatory mediators can cause profound, rapid swelling of the lips, tongue,
glottis, and larynx, threatening airway patency.
QUESTION: Which class of drugs shares similar cardiovascular benefits to ACE inhibitors but
directly blocks angiotensin II AT1 receptors, typically without causing a dry cough? ANSWER:
Angiotensin II Receptor Blockers (ARBs, e.g., losartan). RATIONALE: ARBs block the binding
of angiotensin II to tissue receptors downstream, preventing vasoconstriction and aldosterone
release without increasing bradykinin levels.
QUESTION: What severe electrolyte imbalance must a nurse monitor for when administering
potassium-sparing diuretics (such as spironolactone) alongside ACE inhibitors or ARBs?
ANSWER: Hyperkalemia. RATIONALE: Both drug classes reduce aldosterone activity or renal
potassium excretion, predisposing the patient to dangerously high serum potassium levels.
QUESTION: What is the primary mechanism of action of direct renin inhibitors like aliskiren
(Tekturna)? ANSWER: Binding directly to renin to inhibit the conversion of angiotensinogen to
angiotensin I. RATIONALE: Aliskiren halts the renin-angiotensin-aldosterone system (RAAS) at
its very inception, lowering blood pressure.
QUESTION: Which class of antihypertensive medications prevents calcium ions from entering
vascular smooth muscle and cardiac cells, causing coronary and peripheral vasodilation?
ANSWER: Calcium Channel Blockers (CCBs, e.g., amlodipine, diltiazem). RATIONALE:
Blocking voltage-gated calcium channels reduces intracellular calcium, preventing muscle
contraction and promoting vascular smooth muscle relaxation.
, QUESTION: Why should grapefruit juice be strictly avoided by patients taking certain calcium
channel blockers (such as nifedipine or verapamil)? ANSWER: Inhibition of CYP3A4
metabolism leading to toxic drug accumulation. RATIONALE: Furanocoumarins in grapefruit
juice inhibit intestinal cytochrome P450 3A4 enzymes, drastically increasing drug bioavailability
and risking severe hypotension.
QUESTION: Which centrally acting alpha-2 agonist is utilized for hypertension and attention-
deficit/hyperactivity disorder (ADHD), working by reducing sympathetic outflow from the
central nervous system? ANSWER: Clonidine (Catapres). RATIONALE: Clonidine stimulates
alpha-2 receptors in the brainstem, suppressing sympathetic nervous system activity to lower
heart rate and blood pressure.
QUESTION: What dangerous rebound phenomenon occurs if clonidine is abruptly discontinued?
ANSWER: Severe hypertensive crisis. RATIONALE: Sudden withdrawal of central sympathetic
suppression results in a massive surge of catecholamines, causing dangerous rebound
hypertension and tachycardia.
QUESTION: What is the primary hemodynamic effect of direct-acting vasodilators like
hydralazine? ANSWER: Relaxation of arterial smooth muscle with minimal effect on veins.
RATIONALE: Hydralazine directly dilates resistance arterioles, reducing afterload; reflex
tachycardia often occurs due to baroreceptor activation.
QUESTION: Which loop diuretic is frequently prescribed for acute pulmonary edema and severe
heart failure due to its high potency in the ascending limb of the loop of Henle? ANSWER:
Furosemide (Lasix). RATIONALE: Furosemide inhibits the sodium-potassium-2 chloride (
𝑁
𝑎
+
−
𝐾
+
−
2
𝐶
𝑙
−
