WGU D116 Advanced Pharmacology Pre-
Assessment & Objective Assessment: 200 Practice
Questions with Verified Answers, Detailed
Rationales, and Latest 2026/2027 Exam Updates –
Comprehensive Study Guide for Exam Success
WGU D116 ADVANCED PHARMACOLOGY - 100
PRACTICE QUESTIONS WITH RATIONALES
DOMAIN 1: PHARMACOKINETICS &
PHARMACODYNAMICS (Questions 1-20)
Question 1:
A patient is prescribed a medication that undergoes
extensive first-pass metabolism. Which route of
administration would the nurse expect to have the
highest bioavailability?
A) Oral
B) Sublingual
C) Intravenous
D) Intramuscular
,☑VERIFIED ANSWER: C) Intravenous
Rationale: Intravenous (IV) administration delivers
the drug directly into systemic circulation, bypassing
first-pass metabolism entirely, resulting in 100%
bioavailability. Oral drugs are absorbed from the GI
tract and pass through the liver via the portal
circulation, where they are extensively metabolized
before reaching systemic circulation. Sublingual and
intramuscular routes also bypass first-pass
metabolism but do not achieve 100% bioavailability
like IV.
Question 2:
A nurse is caring for a patient taking a drug that is a
CYP3A4 inhibitor. Which medication interaction
would be of greatest concern?
A) Decreased effectiveness of the inhibited drug
B) Increased toxicity of other medications
metabolized by CYP3A4
,C) Increased excretion of the inhibited drug
D) Decreased protein binding of the inhibited drug
☑VERIFIED ANSWER: B) Increased toxicity of other
medications metabolized by CYP3A4
Rationale: CYP3A4 inhibitors (e.g., grapefruit juice,
ketoconazole, erythromycin) block the metabolism
of other drugs that are substrates for this enzyme.
This leads to increased serum concentrations of
those drugs, potentially causing toxicity. Examples
include increased levels of statins (rhabdomyolysis
risk), calcium channel blockers, and cyclosporine.
Question 3:
A patient is prescribed a drug with a half-life of 12
hours. Approximately how long will it take for the
drug to reach a steady-state concentration?
A) 12 hours
B) 24 hours
, C) 48-60 hours
D) 72-96 hours
☑VERIFIED ANSWER: C) 48-60 hours
Rationale: Steady state is reached after
approximately 4-5 half-lives. With a 12-hour half-
life, steady state would be achieved in 48-60 hours
(4 × 12 = 48 hours; 5 × 12 = 60 hours). At steady
state, the rate of drug administration equals the rate
of drug elimination, and serum concentrations
remain relatively constant.
Question 4:
A patient has a serum creatinine level of 2.8 mg/dL
and a GFR of 30 mL/min. The nurse anticipates what
type of medication adjustment?
A) No adjustment needed
B) Higher doses of renally eliminated drugs
C) Lower doses or extended intervals for renally
eliminated drugs
Assessment & Objective Assessment: 200 Practice
Questions with Verified Answers, Detailed
Rationales, and Latest 2026/2027 Exam Updates –
Comprehensive Study Guide for Exam Success
WGU D116 ADVANCED PHARMACOLOGY - 100
PRACTICE QUESTIONS WITH RATIONALES
DOMAIN 1: PHARMACOKINETICS &
PHARMACODYNAMICS (Questions 1-20)
Question 1:
A patient is prescribed a medication that undergoes
extensive first-pass metabolism. Which route of
administration would the nurse expect to have the
highest bioavailability?
A) Oral
B) Sublingual
C) Intravenous
D) Intramuscular
,☑VERIFIED ANSWER: C) Intravenous
Rationale: Intravenous (IV) administration delivers
the drug directly into systemic circulation, bypassing
first-pass metabolism entirely, resulting in 100%
bioavailability. Oral drugs are absorbed from the GI
tract and pass through the liver via the portal
circulation, where they are extensively metabolized
before reaching systemic circulation. Sublingual and
intramuscular routes also bypass first-pass
metabolism but do not achieve 100% bioavailability
like IV.
Question 2:
A nurse is caring for a patient taking a drug that is a
CYP3A4 inhibitor. Which medication interaction
would be of greatest concern?
A) Decreased effectiveness of the inhibited drug
B) Increased toxicity of other medications
metabolized by CYP3A4
,C) Increased excretion of the inhibited drug
D) Decreased protein binding of the inhibited drug
☑VERIFIED ANSWER: B) Increased toxicity of other
medications metabolized by CYP3A4
Rationale: CYP3A4 inhibitors (e.g., grapefruit juice,
ketoconazole, erythromycin) block the metabolism
of other drugs that are substrates for this enzyme.
This leads to increased serum concentrations of
those drugs, potentially causing toxicity. Examples
include increased levels of statins (rhabdomyolysis
risk), calcium channel blockers, and cyclosporine.
Question 3:
A patient is prescribed a drug with a half-life of 12
hours. Approximately how long will it take for the
drug to reach a steady-state concentration?
A) 12 hours
B) 24 hours
, C) 48-60 hours
D) 72-96 hours
☑VERIFIED ANSWER: C) 48-60 hours
Rationale: Steady state is reached after
approximately 4-5 half-lives. With a 12-hour half-
life, steady state would be achieved in 48-60 hours
(4 × 12 = 48 hours; 5 × 12 = 60 hours). At steady
state, the rate of drug administration equals the rate
of drug elimination, and serum concentrations
remain relatively constant.
Question 4:
A patient has a serum creatinine level of 2.8 mg/dL
and a GFR of 30 mL/min. The nurse anticipates what
type of medication adjustment?
A) No adjustment needed
B) Higher doses of renally eliminated drugs
C) Lower doses or extended intervals for renally
eliminated drugs
