NUR 1141: Introduction to Pharmacology Final
Examination - Questions with Comprehensive
Answers, Rationales, and Diagrams
Instructions: This exam covers foundational pharmacotherapeutics, drug classifications,
mechanisms of action, adverse effects, nursing implications, and clinical reasoning. Questions
span cardiovascular, respiratory, neurologic, endocrine, antimicrobial, gastrointestinal, and renal
drug therapy.
SECTION 1: PHARMACOKINETICS, PHARMACODYNAMICS,
AND DRUG SAFETY (Questions 1-6)
Question 1: Bioavailability and First-Pass Metabolism
A patient is switched from intravenous to oral propranolol. The nurse expects the oral dose to be
higher than the IV dose because of which pharmacokinetic process?
• Increased renal excretion of the drug
• First-pass metabolism in the liver reducing the amount reaching systemic circulation
• Enhanced plasma protein binding
• Rapid gastric emptying into the intestine
Correct Answer: B) First-pass metabolism in the liver reducing the amount reaching systemic
circulation
Rationale: Bioavailability is the fraction of an administered dose that reaches the systemic
circulation unchanged. When a drug is taken orally, it is absorbed from the GI tract and carried
via the portal vein directly to the liver before reaching systemic circulation. The liver metabolizes
a portion of the drug during this first pass, reducing bioavailability. Drugs with extensive first-
pass metabolism (propranolol, nitroglycerin, morphine, verapamil) therefore require larger oral
doses than IV doses to achieve the same therapeutic effect. Some drugs with very high first-
pass metabolism are given by sublingual, transdermal, or IV routes instead.
,Question 2: Drug Half-Life and Steady State
A medication has a half-life of 8 hours. After how many half-lives does the drug typically reach
steady state, and why does steady-state concentration matter clinically?
• 2 half-lives; steady state marks the peak concentration
• 4 to 5 half-lives; the rate of drug administration equals the rate of elimination, producing
stable therapeutic concentrations
• 8 half-lives; steady state indicates complete drug elimination
• 1 half-life; steady state is reached after the first dose
Correct Answer: B) 4 to 5 half-lives; the rate of drug administration equals the rate of
elimination, producing stable therapeutic concentrations
,Rationale: The half-life is the time required for the plasma concentration of a drug to decrease
by 50%. With repeated regular dosing, drug accumulates until the rate of administration
balances the rate of elimination; this equilibrium, called steady state, is reached after
approximately 4 to 5 half-lives. At steady state, plasma concentrations fluctuate within a stable
range between peak and trough. This matters clinically because therapeutic drug monitoring
(e.g., digoxin, phenytoin, vancomycin) typically measures trough levels at steady state to guide
dosing. A loading dose is used to reach steady state faster when a rapid therapeutic effect is
needed.
Question 3: Drug-Receptor Interactions and Agonists
A medication binds to a receptor, activates it, and produces a maximal biologic response. Which
term best describes this drug?
• Antagonist
• Partial agonist
• Full agonist
• Competitive antagonist
Correct Answer: C) Full agonist
Rationale: An agonist binds to a receptor and activates it, producing a response. A full agonist
produces the maximal response the receptor is capable of, achieving full efficacy (intrinsic
activity of 1). A partial agonist binds and activates the receptor but produces a submaximal
response even at full receptor occupancy. An antagonist binds to a receptor without activating it,
blocking the action of endogenous ligands and agonists. A competitive antagonist competes
with an agonist for the same binding site, and its effect can be overcome by increasing agonist
concentration. Understanding agonist versus antagonist action is essential for predicting
therapeutic and adverse effects and for managing overdoses.
SECTION 2: CARDIOVASCULAR PHARMACOLOGY (Questions
4-10)
Question 4: ACE Inhibitors and Angioedema
A patient is started on lisinopril for hypertension. The nurse teaches which potential adverse
effect to report immediately?
• Orthostatic hypotension
• Dry, persistent cough
• Swelling of the face, lips, tongue, or throat (angioedema)
• Hyperkalemia
Correct Answer: C) Swelling of the face, lips, tongue, or throat (angioedema)
, Rationale: ACE inhibitors (lisinopril, enalapril, captopril) block the conversion of angiotensin I to
angiotensin II, reducing vasoconstriction and aldosterone secretion, which lowers blood
pressure. Blockade of ACE also increases bradykinin levels, which causes a dry, persistent
cough and, rarely but dangerously, angioedema (swelling of the face, lips, tongue, and throat).
Angioedema can compromise the airway and is a life-threatening emergency requiring
discontinuation of the drug. It may occur at any point during therapy, including months after
initiation. ACE inhibitors are contraindicated in pregnancy (Category D) and known bilateral
renal artery stenosis. Dry cough and hyperkalemia are also adverse effects but are not the most
immediately life-threatening. The nurse must teach the patient to report any throat or facial
swelling immediately.
Question 5: Beta-Blockers and Beta-1 Selectivity
A patient with heart failure and asthma is prescribed metoprolol. Why is a cardioselective (beta-
1 selective) agent preferred over a nonselective beta-blocker?
Examination - Questions with Comprehensive
Answers, Rationales, and Diagrams
Instructions: This exam covers foundational pharmacotherapeutics, drug classifications,
mechanisms of action, adverse effects, nursing implications, and clinical reasoning. Questions
span cardiovascular, respiratory, neurologic, endocrine, antimicrobial, gastrointestinal, and renal
drug therapy.
SECTION 1: PHARMACOKINETICS, PHARMACODYNAMICS,
AND DRUG SAFETY (Questions 1-6)
Question 1: Bioavailability and First-Pass Metabolism
A patient is switched from intravenous to oral propranolol. The nurse expects the oral dose to be
higher than the IV dose because of which pharmacokinetic process?
• Increased renal excretion of the drug
• First-pass metabolism in the liver reducing the amount reaching systemic circulation
• Enhanced plasma protein binding
• Rapid gastric emptying into the intestine
Correct Answer: B) First-pass metabolism in the liver reducing the amount reaching systemic
circulation
Rationale: Bioavailability is the fraction of an administered dose that reaches the systemic
circulation unchanged. When a drug is taken orally, it is absorbed from the GI tract and carried
via the portal vein directly to the liver before reaching systemic circulation. The liver metabolizes
a portion of the drug during this first pass, reducing bioavailability. Drugs with extensive first-
pass metabolism (propranolol, nitroglycerin, morphine, verapamil) therefore require larger oral
doses than IV doses to achieve the same therapeutic effect. Some drugs with very high first-
pass metabolism are given by sublingual, transdermal, or IV routes instead.
,Question 2: Drug Half-Life and Steady State
A medication has a half-life of 8 hours. After how many half-lives does the drug typically reach
steady state, and why does steady-state concentration matter clinically?
• 2 half-lives; steady state marks the peak concentration
• 4 to 5 half-lives; the rate of drug administration equals the rate of elimination, producing
stable therapeutic concentrations
• 8 half-lives; steady state indicates complete drug elimination
• 1 half-life; steady state is reached after the first dose
Correct Answer: B) 4 to 5 half-lives; the rate of drug administration equals the rate of
elimination, producing stable therapeutic concentrations
,Rationale: The half-life is the time required for the plasma concentration of a drug to decrease
by 50%. With repeated regular dosing, drug accumulates until the rate of administration
balances the rate of elimination; this equilibrium, called steady state, is reached after
approximately 4 to 5 half-lives. At steady state, plasma concentrations fluctuate within a stable
range between peak and trough. This matters clinically because therapeutic drug monitoring
(e.g., digoxin, phenytoin, vancomycin) typically measures trough levels at steady state to guide
dosing. A loading dose is used to reach steady state faster when a rapid therapeutic effect is
needed.
Question 3: Drug-Receptor Interactions and Agonists
A medication binds to a receptor, activates it, and produces a maximal biologic response. Which
term best describes this drug?
• Antagonist
• Partial agonist
• Full agonist
• Competitive antagonist
Correct Answer: C) Full agonist
Rationale: An agonist binds to a receptor and activates it, producing a response. A full agonist
produces the maximal response the receptor is capable of, achieving full efficacy (intrinsic
activity of 1). A partial agonist binds and activates the receptor but produces a submaximal
response even at full receptor occupancy. An antagonist binds to a receptor without activating it,
blocking the action of endogenous ligands and agonists. A competitive antagonist competes
with an agonist for the same binding site, and its effect can be overcome by increasing agonist
concentration. Understanding agonist versus antagonist action is essential for predicting
therapeutic and adverse effects and for managing overdoses.
SECTION 2: CARDIOVASCULAR PHARMACOLOGY (Questions
4-10)
Question 4: ACE Inhibitors and Angioedema
A patient is started on lisinopril for hypertension. The nurse teaches which potential adverse
effect to report immediately?
• Orthostatic hypotension
• Dry, persistent cough
• Swelling of the face, lips, tongue, or throat (angioedema)
• Hyperkalemia
Correct Answer: C) Swelling of the face, lips, tongue, or throat (angioedema)
, Rationale: ACE inhibitors (lisinopril, enalapril, captopril) block the conversion of angiotensin I to
angiotensin II, reducing vasoconstriction and aldosterone secretion, which lowers blood
pressure. Blockade of ACE also increases bradykinin levels, which causes a dry, persistent
cough and, rarely but dangerously, angioedema (swelling of the face, lips, tongue, and throat).
Angioedema can compromise the airway and is a life-threatening emergency requiring
discontinuation of the drug. It may occur at any point during therapy, including months after
initiation. ACE inhibitors are contraindicated in pregnancy (Category D) and known bilateral
renal artery stenosis. Dry cough and hyperkalemia are also adverse effects but are not the most
immediately life-threatening. The nurse must teach the patient to report any throat or facial
swelling immediately.
Question 5: Beta-Blockers and Beta-1 Selectivity
A patient with heart failure and asthma is prescribed metoprolol. Why is a cardioselective (beta-
1 selective) agent preferred over a nonselective beta-blocker?
