Walden University NURS 6521 Fall 2026 Midterm
Practice Exam (docx) | 2026/2027 | Advanced
Pharmacology Q&A | Nursing
1. A medication undergoes extensive hepatic first-pass metabolism. Which administration route most directly
bypasses this effect?
A) Intravenous administration
B) Oral tablet
C) Enteral feeding tube
D) Swallowed capsule
Correct Answer: Intravenous administration
Rationale: Intravenous delivery enters systemic circulation without initial absorption through the portal
circulation. This makes bioavailability complete at administration, although subsequent hepatic clearance still
occurs. Sublingual routes can also bypass much first-pass metabolism, but intravenous delivery provides the
most direct and predictable systemic exposure.
2. An intravenous dose of 200 mg yields an initial plasma concentration of 10 mg/L. What is its apparent volume
of distribution?
A) 2 L
B) 20 L
C) 200 L
D) 2,000 L
Correct Answer: 20 L
,Rationale: Apparent volume of distribution equals the amount of drug in the body divided by its plasma
concentration. Dividing 200 mg by 10 mg/L yields 20 L. The value is a pharmacokinetic estimate of tissue
distribution rather than a literal anatomical fluid compartment.
3. Following repeated administration, when is a drug with linear kinetics typically near steady state?
A) After one half-life
B) Immediately after the first dose
C) After approximately four to five half-lives
D) Only after ten half-lives
Correct Answer: After approximately four to five half-lives
Rationale: With a constant dosing rate and stable clearance, concentrations approach steady state
exponentially. Roughly four to five elimination half-lives achieve about 94% to 97% of the eventual steady-state
level. Changes in dose affect the eventual concentration, whereas changes in half-life alter the time required to
approach it.
4. Severe hypoalbuminemia is most likely to alter which property of a highly albumin-bound acidic drug?
A) Its chemical identity
B) Its tablet strength
C) Its receptor subtype
D) Its unbound plasma fraction
Correct Answer: Its unbound plasma fraction
Rationale: Albumin binds many acidic drugs and limits the fraction immediately available for distribution and
elimination. Reduced albumin can increase the unbound fraction, even when total measured concentrations
,appear low. Interpretation requires clinical context because free concentrations and clearance can change
together, particularly in severe illness.
5. An older adult develops acute kidney injury while taking a renally cleared medication. Which prescribing
consideration takes priority?
A) Reassess renal function and adjust exposure as indicated
B) Automatically double every dose
C) Ignore renal function if the drug is oral
D) Assume serum creatinine alone measures exact filtration
Correct Answer: Reassess renal function and adjust exposure as indicated
Rationale: Acute kidney injury can reduce renal drug clearance and increase accumulation of active drug or
metabolites. Dose selection should account for changing kidney function, the drug's therapeutic index, and
appropriate clinical or laboratory monitoring. A single serum creatinine value may lag behind rapidly changing
filtration.
6. A drug's oral bioavailability is 40%. What fraction of the swallowed dose reaches systemic circulation
unchanged?
A) Ten percent
B) Forty percent
C) Sixty percent
D) One hundred percent
Correct Answer: Forty percent
, Rationale: Bioavailability describes the proportion of administered drug that reaches systemic circulation
unchanged. A value of 40% means 40 of every 100 administered units reach systemic circulation as parent drug.
Incomplete absorption and presystemic metabolism can both contribute to reduced oral bioavailability.
7. A potent CYP enzyme inhibitor is started in a person taking a substrate cleared by that enzyme. What may
occur?
A) Guaranteed loss of substrate activity
B) Immediate renal failure
C) Increased substrate exposure
D) No interaction with any oral medication
Correct Answer: Increased substrate exposure
Rationale: Inhibition of a major metabolic pathway can reduce clearance and increase exposure to its substrate.
The clinical effect depends on how much the enzyme contributes to metabolism and whether active
metabolites are involved. Review interaction references and monitor for concentration-related adverse effects
rather than assuming every inhibitor has identical effects.
8. A loading dose is being considered for a medication with a very long half-life. Which variable chiefly
determines the loading dose?
A) Urinary pH alone
B) The number of prior prescriptions
C) Tablet color
D) Volume of distribution
Correct Answer: Volume of distribution
Practice Exam (docx) | 2026/2027 | Advanced
Pharmacology Q&A | Nursing
1. A medication undergoes extensive hepatic first-pass metabolism. Which administration route most directly
bypasses this effect?
A) Intravenous administration
B) Oral tablet
C) Enteral feeding tube
D) Swallowed capsule
Correct Answer: Intravenous administration
Rationale: Intravenous delivery enters systemic circulation without initial absorption through the portal
circulation. This makes bioavailability complete at administration, although subsequent hepatic clearance still
occurs. Sublingual routes can also bypass much first-pass metabolism, but intravenous delivery provides the
most direct and predictable systemic exposure.
2. An intravenous dose of 200 mg yields an initial plasma concentration of 10 mg/L. What is its apparent volume
of distribution?
A) 2 L
B) 20 L
C) 200 L
D) 2,000 L
Correct Answer: 20 L
,Rationale: Apparent volume of distribution equals the amount of drug in the body divided by its plasma
concentration. Dividing 200 mg by 10 mg/L yields 20 L. The value is a pharmacokinetic estimate of tissue
distribution rather than a literal anatomical fluid compartment.
3. Following repeated administration, when is a drug with linear kinetics typically near steady state?
A) After one half-life
B) Immediately after the first dose
C) After approximately four to five half-lives
D) Only after ten half-lives
Correct Answer: After approximately four to five half-lives
Rationale: With a constant dosing rate and stable clearance, concentrations approach steady state
exponentially. Roughly four to five elimination half-lives achieve about 94% to 97% of the eventual steady-state
level. Changes in dose affect the eventual concentration, whereas changes in half-life alter the time required to
approach it.
4. Severe hypoalbuminemia is most likely to alter which property of a highly albumin-bound acidic drug?
A) Its chemical identity
B) Its tablet strength
C) Its receptor subtype
D) Its unbound plasma fraction
Correct Answer: Its unbound plasma fraction
Rationale: Albumin binds many acidic drugs and limits the fraction immediately available for distribution and
elimination. Reduced albumin can increase the unbound fraction, even when total measured concentrations
,appear low. Interpretation requires clinical context because free concentrations and clearance can change
together, particularly in severe illness.
5. An older adult develops acute kidney injury while taking a renally cleared medication. Which prescribing
consideration takes priority?
A) Reassess renal function and adjust exposure as indicated
B) Automatically double every dose
C) Ignore renal function if the drug is oral
D) Assume serum creatinine alone measures exact filtration
Correct Answer: Reassess renal function and adjust exposure as indicated
Rationale: Acute kidney injury can reduce renal drug clearance and increase accumulation of active drug or
metabolites. Dose selection should account for changing kidney function, the drug's therapeutic index, and
appropriate clinical or laboratory monitoring. A single serum creatinine value may lag behind rapidly changing
filtration.
6. A drug's oral bioavailability is 40%. What fraction of the swallowed dose reaches systemic circulation
unchanged?
A) Ten percent
B) Forty percent
C) Sixty percent
D) One hundred percent
Correct Answer: Forty percent
, Rationale: Bioavailability describes the proportion of administered drug that reaches systemic circulation
unchanged. A value of 40% means 40 of every 100 administered units reach systemic circulation as parent drug.
Incomplete absorption and presystemic metabolism can both contribute to reduced oral bioavailability.
7. A potent CYP enzyme inhibitor is started in a person taking a substrate cleared by that enzyme. What may
occur?
A) Guaranteed loss of substrate activity
B) Immediate renal failure
C) Increased substrate exposure
D) No interaction with any oral medication
Correct Answer: Increased substrate exposure
Rationale: Inhibition of a major metabolic pathway can reduce clearance and increase exposure to its substrate.
The clinical effect depends on how much the enzyme contributes to metabolism and whether active
metabolites are involved. Review interaction references and monitor for concentration-related adverse effects
rather than assuming every inhibitor has identical effects.
8. A loading dose is being considered for a medication with a very long half-life. Which variable chiefly
determines the loading dose?
A) Urinary pH alone
B) The number of prior prescriptions
C) Tablet color
D) Volume of distribution
Correct Answer: Volume of distribution
