NUR 210 Exam 1: Principles of Pharmacology - Galen
College of Nursing Updated and Latest Questions and
Correct Answers with Rationale
1. A nurse is administering a medication that has a high first-pass effect. Which route would result in the
lowest bioavailability for this drug?
A. Intravenous
B. Sublingual
C. Oral
D. Transdermal
Correct Answer: C
Rationale: The first-pass effect occurs when a drug is metabolized in the liver before reaching systemic
circulation. Oral medications pass through the portal vein to the liver, significantly reducing the active
drug concentration. Intravenous and sublingual routes bypass the liver initially, providing higher
bioavailability. Transdermal administration also avoids the initial hepatic metabolism. Therefore, the oral
route is most affected by this physiological process.
2. Which pharmacokinetic process is most affected by a patient with chronic renal failure?
A. Excretion
B. Distribution
C. Metabolism
D. Absorption
Correct Answer: A
,Rationale: Excretion is the process of removing drugs from the body, primarily through the kidneys.
Chronic renal failure impairs the ability of the kidneys to filter and eliminate drug metabolites. This can
lead to drug accumulation and potential toxicity if dosages are not adjusted. While other processes might
be slightly altered, excretion is the primary concern in renal impairment. Nurses must monitor laboratory
values like serum creatinine and BUN for these patients.
3. A drug has a half-life of 4 hours. If a patient receives a 100 mg dose, how much of the drug will remain in
the body after 12 hours?
A. 50 mg
B. 25 mg
C. 12.5 mg
D. 6.25 mg
Correct Answer: C
Rationale: Half-life is the time required for the concentration of a drug to decrease by 50 percent. After
the first 4 hours, 50 mg remains in the body. After 8 hours (two half-lives), the amount drops to 25 mg. At
12 hours (three half-lives), only 12.5 mg of the original dose remains. This mathematical concept helps
nurses determine dosing intervals and steady-state timing.
4. When considering drug-protein binding, what happens when a patient has a very low serum albumin
level?
A. The drug becomes less effective
B. Metabolism of the drug in the liver increases
C. The drug is excreted more quickly
D. There is an increased risk of drug toxicity
, Correct Answer: D
Rationale: Albumin is the primary protein in the blood that binds to many drug molecules. Only ‘free’ or
unbound drug molecules are pharmacologically active and able to exert an effect. With low albumin
levels, fewer binding sites are available, leading to more free drug in the bloodstream. This excess of
active drug significantly increases the risk for adverse effects and toxicity. Nurses should monitor
patients with malnutrition or liver disease closely for this reason.
5. A drug that binds to a receptor and produces a maximum biological response is categorized as a(n):
A. Antagonist
B. Inhibitor
C. Partial Agonist
D. Agonist
Correct Answer: D
Rationale: Agonists are drugs that mimic the body’s own regulatory molecules by activating receptors.
They possess both affinity for the receptor and intrinsic activity to trigger a response. Antagonists, in
contrast, block receptor activation by preventing agonists from binding. A partial agonist produces a
response but with lower maximal efficacy than a full agonist. Understanding these interactions is
fundamental to grasping how different medications produce therapeutic outcomes.
6. The nurse is reviewing the ‘Therapeutic Index’ of a drug. A narrow therapeutic index indicates that:
A. The drug is very safe to administer
B. The drug has a long half-life
C. The drug is poorly absorbed in the GI tract
D. There is a small margin between the effective and lethal dose
College of Nursing Updated and Latest Questions and
Correct Answers with Rationale
1. A nurse is administering a medication that has a high first-pass effect. Which route would result in the
lowest bioavailability for this drug?
A. Intravenous
B. Sublingual
C. Oral
D. Transdermal
Correct Answer: C
Rationale: The first-pass effect occurs when a drug is metabolized in the liver before reaching systemic
circulation. Oral medications pass through the portal vein to the liver, significantly reducing the active
drug concentration. Intravenous and sublingual routes bypass the liver initially, providing higher
bioavailability. Transdermal administration also avoids the initial hepatic metabolism. Therefore, the oral
route is most affected by this physiological process.
2. Which pharmacokinetic process is most affected by a patient with chronic renal failure?
A. Excretion
B. Distribution
C. Metabolism
D. Absorption
Correct Answer: A
,Rationale: Excretion is the process of removing drugs from the body, primarily through the kidneys.
Chronic renal failure impairs the ability of the kidneys to filter and eliminate drug metabolites. This can
lead to drug accumulation and potential toxicity if dosages are not adjusted. While other processes might
be slightly altered, excretion is the primary concern in renal impairment. Nurses must monitor laboratory
values like serum creatinine and BUN for these patients.
3. A drug has a half-life of 4 hours. If a patient receives a 100 mg dose, how much of the drug will remain in
the body after 12 hours?
A. 50 mg
B. 25 mg
C. 12.5 mg
D. 6.25 mg
Correct Answer: C
Rationale: Half-life is the time required for the concentration of a drug to decrease by 50 percent. After
the first 4 hours, 50 mg remains in the body. After 8 hours (two half-lives), the amount drops to 25 mg. At
12 hours (three half-lives), only 12.5 mg of the original dose remains. This mathematical concept helps
nurses determine dosing intervals and steady-state timing.
4. When considering drug-protein binding, what happens when a patient has a very low serum albumin
level?
A. The drug becomes less effective
B. Metabolism of the drug in the liver increases
C. The drug is excreted more quickly
D. There is an increased risk of drug toxicity
, Correct Answer: D
Rationale: Albumin is the primary protein in the blood that binds to many drug molecules. Only ‘free’ or
unbound drug molecules are pharmacologically active and able to exert an effect. With low albumin
levels, fewer binding sites are available, leading to more free drug in the bloodstream. This excess of
active drug significantly increases the risk for adverse effects and toxicity. Nurses should monitor
patients with malnutrition or liver disease closely for this reason.
5. A drug that binds to a receptor and produces a maximum biological response is categorized as a(n):
A. Antagonist
B. Inhibitor
C. Partial Agonist
D. Agonist
Correct Answer: D
Rationale: Agonists are drugs that mimic the body’s own regulatory molecules by activating receptors.
They possess both affinity for the receptor and intrinsic activity to trigger a response. Antagonists, in
contrast, block receptor activation by preventing agonists from binding. A partial agonist produces a
response but with lower maximal efficacy than a full agonist. Understanding these interactions is
fundamental to grasping how different medications produce therapeutic outcomes.
6. The nurse is reviewing the ‘Therapeutic Index’ of a drug. A narrow therapeutic index indicates that:
A. The drug is very safe to administer
B. The drug has a long half-life
C. The drug is poorly absorbed in the GI tract
D. There is a small margin between the effective and lethal dose
