KAPLAN PHAMACOLOGY A,B,C FINAL
SEMESTER] QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A |LATEST EXAM
UPDATE 2026/2027
1. A drug with a narrow therapeutic index requires which nursing action?
• A) Once-daily dosing only
• B) Frequent monitoring of serum drug levels
• C) Administration with food only
• D) No special monitoring
Correct Answer: B) Frequent monitoring of serum drug levels
Rationale: Drugs with a narrow therapeutic index (e.g., digoxin, lithium, warfarin,
phenytoin) have a small margin between therapeutic and toxic doses. Frequent
monitoring of serum drug levels is essential to avoid toxicity and ensure efficacy.
2. Which of the following is the most important factor in determining a drug's
ability to cross the blood-brain barrier?
, • A) Molecular weight
• B) Lipid solubility
• C) Protein binding
• D) Charge
Correct Answer: B) Lipid solubility
Rationale: Lipid solubility (lipophilicity) is the most important factor determining a
drug's ability to cross the blood-brain barrier. Highly lipid-soluble drugs cross more
readily because they can passively diffuse through the lipid bilayer of endothelial
cells.
3. A drug that is a CYP3A4 inhibitor would be expected to:
• A) Increase the metabolism of other drugs metabolized by CYP3A4
• B) Decrease the metabolism of other drugs metabolized by CYP3A4
• C) Have no effect on other drugs
• D) Increase the excretion of other drugs
Correct Answer: B) Decrease the metabolism of other drugs metabolized by
CYP3A4
Rationale: CYP3A4 inhibitors decrease the activity of the CYP3A4 enzyme, leading
to decreased metabolism and increased serum levels of other drugs that are
metabolized by CYP3A4. This can lead to toxicity.
,4. A nurse is preparing to administer an oral medication that undergoes
extensive first-pass metabolism. Which route of administration would provide
the highest bioavailability for this drug?
• A) Oral
• B) Rectal
• C) Intravenous
• D) Sublingual
Correct Answer: C) Intravenous
Rationale: Intravenous (IV) administration delivers the drug directly into the
bloodstream, completely bypassing the GI tract and liver, resulting in 100%
bioavailability. Oral drugs pass through the portal circulation to the liver where they
may be extensively metabolized (first-pass effect), reducing bioavailability.
5. A client with renal impairment is prescribed a drug that is primarily
eliminated by the kidneys. Which parameter should the nurse monitor most
closely to prevent toxicity?
• A) Serum albumin
• B) Alanine aminotransferase (ALT)
• C) Glomerular filtration rate (GFR)
• D) Prothrombin time (PT)
Correct Answer: C) Glomerular filtration rate (GFR)
Rationale: GFR is the best indicator of renal function. Drugs excreted unchanged
by the kidneys require dose reduction in renal impairment to avoid accumulation
and toxicity.
, 6. The nurse is administering a loading dose of a medication. The primary
purpose of a loading dose is to:
• A) Decrease the risk of adverse effects
• B) Rapidly achieve a therapeutic plasma concentration
• C) Maintain the steady-state concentration
• D) Prolong the half-life of the drug
Correct Answer: B) Rapidly achieve a therapeutic plasma concentration
Rationale: A loading dose rapidly achieves therapeutic plasma concentrations
without waiting for steady state to be reached through multiple maintenance
doses.
7. The nurse is to administer an enteric-coated tablet. The client requests that
it be crushed and mixed with applesauce. The nurse should:
• A) Crush the tablet and mix it
• B) Explain that the tablet cannot be crushed because it would be inactivated
by stomach acid or cause irritation
• C) Give the tablet whole with a full glass of water
• D) Call the pharmacy for a liquid form
Correct Answer: B) Explain that the tablet cannot be crushed because it would
be inactivated by stomach acid or cause irritation
Rationale: Enteric coating protects the stomach from the drug and the drug from
stomach acid. Crushing destroys this protection.
SEMESTER] QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A |LATEST EXAM
UPDATE 2026/2027
1. A drug with a narrow therapeutic index requires which nursing action?
• A) Once-daily dosing only
• B) Frequent monitoring of serum drug levels
• C) Administration with food only
• D) No special monitoring
Correct Answer: B) Frequent monitoring of serum drug levels
Rationale: Drugs with a narrow therapeutic index (e.g., digoxin, lithium, warfarin,
phenytoin) have a small margin between therapeutic and toxic doses. Frequent
monitoring of serum drug levels is essential to avoid toxicity and ensure efficacy.
2. Which of the following is the most important factor in determining a drug's
ability to cross the blood-brain barrier?
, • A) Molecular weight
• B) Lipid solubility
• C) Protein binding
• D) Charge
Correct Answer: B) Lipid solubility
Rationale: Lipid solubility (lipophilicity) is the most important factor determining a
drug's ability to cross the blood-brain barrier. Highly lipid-soluble drugs cross more
readily because they can passively diffuse through the lipid bilayer of endothelial
cells.
3. A drug that is a CYP3A4 inhibitor would be expected to:
• A) Increase the metabolism of other drugs metabolized by CYP3A4
• B) Decrease the metabolism of other drugs metabolized by CYP3A4
• C) Have no effect on other drugs
• D) Increase the excretion of other drugs
Correct Answer: B) Decrease the metabolism of other drugs metabolized by
CYP3A4
Rationale: CYP3A4 inhibitors decrease the activity of the CYP3A4 enzyme, leading
to decreased metabolism and increased serum levels of other drugs that are
metabolized by CYP3A4. This can lead to toxicity.
,4. A nurse is preparing to administer an oral medication that undergoes
extensive first-pass metabolism. Which route of administration would provide
the highest bioavailability for this drug?
• A) Oral
• B) Rectal
• C) Intravenous
• D) Sublingual
Correct Answer: C) Intravenous
Rationale: Intravenous (IV) administration delivers the drug directly into the
bloodstream, completely bypassing the GI tract and liver, resulting in 100%
bioavailability. Oral drugs pass through the portal circulation to the liver where they
may be extensively metabolized (first-pass effect), reducing bioavailability.
5. A client with renal impairment is prescribed a drug that is primarily
eliminated by the kidneys. Which parameter should the nurse monitor most
closely to prevent toxicity?
• A) Serum albumin
• B) Alanine aminotransferase (ALT)
• C) Glomerular filtration rate (GFR)
• D) Prothrombin time (PT)
Correct Answer: C) Glomerular filtration rate (GFR)
Rationale: GFR is the best indicator of renal function. Drugs excreted unchanged
by the kidneys require dose reduction in renal impairment to avoid accumulation
and toxicity.
, 6. The nurse is administering a loading dose of a medication. The primary
purpose of a loading dose is to:
• A) Decrease the risk of adverse effects
• B) Rapidly achieve a therapeutic plasma concentration
• C) Maintain the steady-state concentration
• D) Prolong the half-life of the drug
Correct Answer: B) Rapidly achieve a therapeutic plasma concentration
Rationale: A loading dose rapidly achieves therapeutic plasma concentrations
without waiting for steady state to be reached through multiple maintenance
doses.
7. The nurse is to administer an enteric-coated tablet. The client requests that
it be crushed and mixed with applesauce. The nurse should:
• A) Crush the tablet and mix it
• B) Explain that the tablet cannot be crushed because it would be inactivated
by stomach acid or cause irritation
• C) Give the tablet whole with a full glass of water
• D) Call the pharmacy for a liquid form
Correct Answer: B) Explain that the tablet cannot be crushed because it would
be inactivated by stomach acid or cause irritation
Rationale: Enteric coating protects the stomach from the drug and the drug from
stomach acid. Crushing destroys this protection.
