,WGU D116 Proctored OA Advanced Pharmacology for the Advanced
Practice Nurse 2026/2027 Questions And Answers
Q1. Which process describes the movement of a drug from its site of
administration into the systemic circulation?
A) Distribution
B) Metabolism
C) Absorption
D) Excretion
Correct Answer: C) Absorption
Rationale: Absorption is the transfer of a medication from its administration
site into the bloodstream, where it becomes available for distribution to
tissues.
Q2. Which pharmacokinetic characteristic most directly determines
how much of an administered dose reaches systemic circulation
unchanged?
A) Bioavailability
B) Potency
C) Efficacy
D) Therapeutic index
Correct Answer: A) Bioavailability
Rationale: Bioavailability represents the fraction of an administered drug
dose that reaches systemic circulation in active form.
Q3. Why does oral administration commonly result in lower
bioavailability than intravenous administration?
A) Oral drugs are never completely absorbed.
B) Oral drugs may undergo intestinal and hepatic first-pass metabolism
before reaching systemic circulation.
C) Intravenous drugs undergo greater first-pass metabolism.
D) Oral drugs bypass the liver entirely.
Correct Answer: B) Oral drugs may undergo intestinal and hepatic first-pass
metabolism before reaching systemic circulation.
Rationale: Drugs absorbed from the gastrointestinal tract commonly pass
through the portal circulation and liver before reaching systemic circulation,
allowing presystemic metabolism to reduce available drug.
,Q4. Which pharmacokinetic phase involves reversible movement of
medication from the bloodstream into tissues?
A) Distribution
B) Elimination
C) Biotransformation
D) Absorption
Correct Answer: A) Distribution
Rationale: Distribution describes the movement of drug molecules between
the bloodstream and body tissues after absorption.
Q5. A highly protein-bound medication is administered to a patient
with severe hypoalbuminemia. What effect is most likely?
A) Complete failure of drug absorption
B) Decreased renal filtration of all drug molecules
C) An increased proportion of pharmacologically active unbound drug
D) Elimination of hepatic metabolism
Correct Answer: C) An increased proportion of pharmacologically active
unbound drug
Rationale: Only unbound drug is generally able to cross membranes and
interact with receptors. Reduced albumin can therefore increase free
concentrations of highly protein-bound medications.
Q6. Which organ is primarily responsible for metabolism of many
medications through cytochrome P450 enzymes?
A) Lung
B) Spleen
C) Liver
D) Pancreas
Correct Answer: C) Liver
Rationale: The liver is the major site of drug biotransformation and contains
many CYP450 enzymes involved in phase I metabolism.
Q7. A medication strongly inhibits CYP3A4. What effect can occur
when it is given with another drug primarily metabolized by
CYP3A4?
, A) The second drug is absorbed more slowly but cleared faster.
B) The second drug is converted immediately into an inactive compound.
C) Renal filtration of the second drug increases.
D) Plasma concentrations of the second drug may rise because its
metabolism decreases.
Correct Answer: D) Plasma concentrations of the second drug may rise
because its metabolism decreases.
Rationale: Enzyme inhibition reduces metabolism of susceptible substrates
and can increase their plasma concentrations and toxicity risk.
Q8. What is the most likely effect of a strong hepatic enzyme
inducer on a drug metabolized by that enzyme?
A) Decreased drug concentration because metabolism accelerates
B) Increased drug concentration because elimination stops
C) Elimination of first-pass metabolism
D) Increased receptor sensitivity
Correct Answer: A) Decreased drug concentration because metabolism
accelerates
Rationale: Enzyme induction increases metabolic activity and may decrease
concentrations and therapeutic effects of drugs metabolized by the induced
pathway.
Q9. A medication has a half-life of 12 hours. Approximately how long
is generally required to reach steady state with repeated regular
dosing?
A) 12 hours
B) About 48–60 hours
C) 24 hours
D) 120 hours after every dose
Correct Answer: B) About 48–60 hours
Rationale: Most medications approach steady state after approximately four
to five half-lives.
Q10. What is the principal purpose of administering a loading dose?
A) Achieve a therapeutic plasma concentration more rapidly
B) Reduce a drug's bioavailability
Practice Nurse 2026/2027 Questions And Answers
Q1. Which process describes the movement of a drug from its site of
administration into the systemic circulation?
A) Distribution
B) Metabolism
C) Absorption
D) Excretion
Correct Answer: C) Absorption
Rationale: Absorption is the transfer of a medication from its administration
site into the bloodstream, where it becomes available for distribution to
tissues.
Q2. Which pharmacokinetic characteristic most directly determines
how much of an administered dose reaches systemic circulation
unchanged?
A) Bioavailability
B) Potency
C) Efficacy
D) Therapeutic index
Correct Answer: A) Bioavailability
Rationale: Bioavailability represents the fraction of an administered drug
dose that reaches systemic circulation in active form.
Q3. Why does oral administration commonly result in lower
bioavailability than intravenous administration?
A) Oral drugs are never completely absorbed.
B) Oral drugs may undergo intestinal and hepatic first-pass metabolism
before reaching systemic circulation.
C) Intravenous drugs undergo greater first-pass metabolism.
D) Oral drugs bypass the liver entirely.
Correct Answer: B) Oral drugs may undergo intestinal and hepatic first-pass
metabolism before reaching systemic circulation.
Rationale: Drugs absorbed from the gastrointestinal tract commonly pass
through the portal circulation and liver before reaching systemic circulation,
allowing presystemic metabolism to reduce available drug.
,Q4. Which pharmacokinetic phase involves reversible movement of
medication from the bloodstream into tissues?
A) Distribution
B) Elimination
C) Biotransformation
D) Absorption
Correct Answer: A) Distribution
Rationale: Distribution describes the movement of drug molecules between
the bloodstream and body tissues after absorption.
Q5. A highly protein-bound medication is administered to a patient
with severe hypoalbuminemia. What effect is most likely?
A) Complete failure of drug absorption
B) Decreased renal filtration of all drug molecules
C) An increased proportion of pharmacologically active unbound drug
D) Elimination of hepatic metabolism
Correct Answer: C) An increased proportion of pharmacologically active
unbound drug
Rationale: Only unbound drug is generally able to cross membranes and
interact with receptors. Reduced albumin can therefore increase free
concentrations of highly protein-bound medications.
Q6. Which organ is primarily responsible for metabolism of many
medications through cytochrome P450 enzymes?
A) Lung
B) Spleen
C) Liver
D) Pancreas
Correct Answer: C) Liver
Rationale: The liver is the major site of drug biotransformation and contains
many CYP450 enzymes involved in phase I metabolism.
Q7. A medication strongly inhibits CYP3A4. What effect can occur
when it is given with another drug primarily metabolized by
CYP3A4?
, A) The second drug is absorbed more slowly but cleared faster.
B) The second drug is converted immediately into an inactive compound.
C) Renal filtration of the second drug increases.
D) Plasma concentrations of the second drug may rise because its
metabolism decreases.
Correct Answer: D) Plasma concentrations of the second drug may rise
because its metabolism decreases.
Rationale: Enzyme inhibition reduces metabolism of susceptible substrates
and can increase their plasma concentrations and toxicity risk.
Q8. What is the most likely effect of a strong hepatic enzyme
inducer on a drug metabolized by that enzyme?
A) Decreased drug concentration because metabolism accelerates
B) Increased drug concentration because elimination stops
C) Elimination of first-pass metabolism
D) Increased receptor sensitivity
Correct Answer: A) Decreased drug concentration because metabolism
accelerates
Rationale: Enzyme induction increases metabolic activity and may decrease
concentrations and therapeutic effects of drugs metabolized by the induced
pathway.
Q9. A medication has a half-life of 12 hours. Approximately how long
is generally required to reach steady state with repeated regular
dosing?
A) 12 hours
B) About 48–60 hours
C) 24 hours
D) 120 hours after every dose
Correct Answer: B) About 48–60 hours
Rationale: Most medications approach steady state after approximately four
to five half-lives.
Q10. What is the principal purpose of administering a loading dose?
A) Achieve a therapeutic plasma concentration more rapidly
B) Reduce a drug's bioavailability
