UCSF U141 PHARMACOLOGY FINAL
EXAM 2026/2027 – 150 VERIFIED
Q&A WITH DETAILED RATIONALES |
MEPN NURSING PREP | INSTANT
PDF DOWNLOAD
Domain 1: Pharmacokinetics & Pharmacodynamics
1. What does pharmacokinetics describe?
A. What the drug does to the body
B. What the body does to the drug (absorption, distribution, metabolism, excretion)
C. Only receptor binding
D. Only adverse effects
Answer: B. Rationale: Pharmacokinetics is the study of ADME processes that determine
drug concentration over time.
2. Which route of administration completely bypasses absorption?
A. Oral
B. Intravenous
C. Intramuscular
D. Subcutaneous
Answer: B. Rationale: IV administration places the drug directly into the bloodstream,
eliminating the absorption step.
3. Which organ is the primary site of drug metabolism for most drugs?
A. Kidney
B. Liver
C. Lung
D. Spleen
Answer: B. Rationale: The liver is the principal organ of drug metabolism via
cytochrome P450 and other enzymes.
4. What is the first-pass effect?
A. Rapid renal clearance
B. Metabolism of an orally administered drug by the liver before it reaches systemic
circulation
,C. Enhanced absorption in the stomach
D. Protein binding in plasma
Answer: B. Rationale: Oral drugs absorbed from the GI tract pass through the portal
circulation and may be extensively metabolized before systemic distribution.
5. What is drug half-life?
A. Time to peak effect
B. Time required for the plasma concentration to decrease by 50%
C. Duration of receptor occupancy
D. Time to steady state only
Answer: B. Rationale: Half-life is the time it takes for the plasma concentration of a
drug to reduce by half.
6. What is the definition of steady state?
A. The point at which drug absorption equals elimination
B. The point at which drug absorption equals elimination, resulting in a constant
plasma concentration
C. The peak plasma concentration
D. The trough plasma concentration
Answer: B. Rationale: Steady state is reached when the rate of drug administration
equals the rate of drug elimination.
7. Which CYP450 enzyme is responsible for metabolizing a large proportion of
commonly prescribed drugs?
A. CYP1A2 only
B. CYP3A
C. CYP2D6 exclusively
D. CYP2C19 only
Answer: B. Rationale: CYP3A4 metabolizes a substantial fraction (approximately 50%)
of clinically used drugs.
8. What is the therapeutic index (TI)?
A. The ratio of the median effective dose to the median lethal dose
B. The ratio of the median lethal dose (LD50) to the median effective dose (ED50)
C. The ratio of the peak to trough concentration
D. The time to onset of action
Answer: B. Rationale: TI = LD50 / ED50. A narrow therapeutic index means there is a
small margin between therapeutic and toxic doses.
9. Which of the following describes a competitive antagonist?
A. Binds to a different site than the agonist
B. Binds reversibly to the same receptor site as the agonist, shifting the dose-
response curve to the right
C. Permanently inactivates the receptor
,D. Increases the maximum efficacy of the agonist
Answer: B. Rationale: Competitive antagonists bind reversibly to the agonist binding
site, shifting the dose-response curve to the right but not decreasing maximal efficacy.
10. Which of the following routes of administration has the highest
bioavailability?
A. Oral
B. Rectal
C. Intravenous
D. Subcutaneous
Answer: C. Rationale: Intravenous administration delivers the drug directly into the
systemic circulation, resulting in 100% bioavailability.
11. Which of the following factors can increase drug metabolism?
A. Hepatic impairment
B. Enzyme induction (e.g., by rifampin, carbamazepine)
C. Enzyme inhibition (e.g., by ketoconazole, erythromycin)
D. Decreased renal blood flow
Answer: B. Rationale: Enzyme inducers increase the synthesis of CYP450 enzymes,
leading to faster metabolism of drugs.
12. What is the effect of an enzyme inhibitor on the plasma concentration of a
drug metabolized by that enzyme?
A. Decreases plasma concentration
B. Increases plasma concentration
C. Has no effect
D. Increases renal excretion
Answer: B. Rationale: Enzyme inhibitors decrease the rate of drug metabolism, leading
to increased plasma concentrations and toxicity risk.
13. Which term describes the fraction of an administered dose that reaches the
systemic circulation unchanged?
A. Potency
B. Half-life
C. Bioavailability
D. Efficacy
Answer: C. Rationale: Bioavailability is the proportion of a dose that reaches systemic
circulation in an active, unchanged form.
14. A medication undergoes extensive first-pass metabolism. Which route is
most directly affected by this phenomenon?
A. Intravenous
B. Intramuscular
C. Subcutaneous
, D. Oral
Answer: D. Rationale: Orally absorbed drugs commonly pass through the portal
circulation and liver before reaching systemic circulation, allowing first-pass
metabolism to reduce bioavailability.
15. A patient with severe hypoalbuminemia receives a highly protein-bound
medication. Which effect should the nurse anticipate?
A. A greater free-drug fraction and possible toxicity
B. A lower free-drug fraction
C. Complete loss of drug absorption
D. Immediate renal elimination of the entire dose
Answer: A. Rationale: Low albumin leaves fewer binding sites, increasing the unbound
pharmacologically active fraction of highly protein-bound drugs and potentially
increasing toxicity.
16. A patient develops acute kidney injury while taking a medication eliminated
primarily by the kidneys. What is the nurse's priority concern?
A. The drug will be absorbed more slowly from the stomach
B. The drug will become completely protein bound
C. The drug may accumulate and cause toxicity
D. The drug will no longer have any therapeutic effect
Answer: C. Rationale: Reduced renal clearance can prolong drug exposure and increase
serum concentrations, making accumulation and toxicity a major concern.
17. A drug has a long half-life. Which implication is most accurate?
A. It is always safer than a short-half-life drug
B. It cannot cause toxicity
C. It must be given intravenously
D. It generally takes longer to reach steady state and longer to be eliminated
Answer: D. Rationale: Longer half-life generally means slower accumulation to steady
state and slower decline after the drug is stopped.
18. Which statement best distinguishes potency from efficacy?
A. Potency is the amount needed for an effect; efficacy is the maximum effect a drug
can produce
B. Potency and efficacy mean exactly the same thing
C. Efficacy describes only absorption
D. Potency describes only toxicity
Answer: A. Rationale: Potency concerns how much drug is required to produce an
effect, whereas efficacy refers to the maximal effect the drug can achieve.
19. A medication has a narrow therapeutic index. Which nursing action is most
important?
A. Assume small dose changes are harmless
EXAM 2026/2027 – 150 VERIFIED
Q&A WITH DETAILED RATIONALES |
MEPN NURSING PREP | INSTANT
PDF DOWNLOAD
Domain 1: Pharmacokinetics & Pharmacodynamics
1. What does pharmacokinetics describe?
A. What the drug does to the body
B. What the body does to the drug (absorption, distribution, metabolism, excretion)
C. Only receptor binding
D. Only adverse effects
Answer: B. Rationale: Pharmacokinetics is the study of ADME processes that determine
drug concentration over time.
2. Which route of administration completely bypasses absorption?
A. Oral
B. Intravenous
C. Intramuscular
D. Subcutaneous
Answer: B. Rationale: IV administration places the drug directly into the bloodstream,
eliminating the absorption step.
3. Which organ is the primary site of drug metabolism for most drugs?
A. Kidney
B. Liver
C. Lung
D. Spleen
Answer: B. Rationale: The liver is the principal organ of drug metabolism via
cytochrome P450 and other enzymes.
4. What is the first-pass effect?
A. Rapid renal clearance
B. Metabolism of an orally administered drug by the liver before it reaches systemic
circulation
,C. Enhanced absorption in the stomach
D. Protein binding in plasma
Answer: B. Rationale: Oral drugs absorbed from the GI tract pass through the portal
circulation and may be extensively metabolized before systemic distribution.
5. What is drug half-life?
A. Time to peak effect
B. Time required for the plasma concentration to decrease by 50%
C. Duration of receptor occupancy
D. Time to steady state only
Answer: B. Rationale: Half-life is the time it takes for the plasma concentration of a
drug to reduce by half.
6. What is the definition of steady state?
A. The point at which drug absorption equals elimination
B. The point at which drug absorption equals elimination, resulting in a constant
plasma concentration
C. The peak plasma concentration
D. The trough plasma concentration
Answer: B. Rationale: Steady state is reached when the rate of drug administration
equals the rate of drug elimination.
7. Which CYP450 enzyme is responsible for metabolizing a large proportion of
commonly prescribed drugs?
A. CYP1A2 only
B. CYP3A
C. CYP2D6 exclusively
D. CYP2C19 only
Answer: B. Rationale: CYP3A4 metabolizes a substantial fraction (approximately 50%)
of clinically used drugs.
8. What is the therapeutic index (TI)?
A. The ratio of the median effective dose to the median lethal dose
B. The ratio of the median lethal dose (LD50) to the median effective dose (ED50)
C. The ratio of the peak to trough concentration
D. The time to onset of action
Answer: B. Rationale: TI = LD50 / ED50. A narrow therapeutic index means there is a
small margin between therapeutic and toxic doses.
9. Which of the following describes a competitive antagonist?
A. Binds to a different site than the agonist
B. Binds reversibly to the same receptor site as the agonist, shifting the dose-
response curve to the right
C. Permanently inactivates the receptor
,D. Increases the maximum efficacy of the agonist
Answer: B. Rationale: Competitive antagonists bind reversibly to the agonist binding
site, shifting the dose-response curve to the right but not decreasing maximal efficacy.
10. Which of the following routes of administration has the highest
bioavailability?
A. Oral
B. Rectal
C. Intravenous
D. Subcutaneous
Answer: C. Rationale: Intravenous administration delivers the drug directly into the
systemic circulation, resulting in 100% bioavailability.
11. Which of the following factors can increase drug metabolism?
A. Hepatic impairment
B. Enzyme induction (e.g., by rifampin, carbamazepine)
C. Enzyme inhibition (e.g., by ketoconazole, erythromycin)
D. Decreased renal blood flow
Answer: B. Rationale: Enzyme inducers increase the synthesis of CYP450 enzymes,
leading to faster metabolism of drugs.
12. What is the effect of an enzyme inhibitor on the plasma concentration of a
drug metabolized by that enzyme?
A. Decreases plasma concentration
B. Increases plasma concentration
C. Has no effect
D. Increases renal excretion
Answer: B. Rationale: Enzyme inhibitors decrease the rate of drug metabolism, leading
to increased plasma concentrations and toxicity risk.
13. Which term describes the fraction of an administered dose that reaches the
systemic circulation unchanged?
A. Potency
B. Half-life
C. Bioavailability
D. Efficacy
Answer: C. Rationale: Bioavailability is the proportion of a dose that reaches systemic
circulation in an active, unchanged form.
14. A medication undergoes extensive first-pass metabolism. Which route is
most directly affected by this phenomenon?
A. Intravenous
B. Intramuscular
C. Subcutaneous
, D. Oral
Answer: D. Rationale: Orally absorbed drugs commonly pass through the portal
circulation and liver before reaching systemic circulation, allowing first-pass
metabolism to reduce bioavailability.
15. A patient with severe hypoalbuminemia receives a highly protein-bound
medication. Which effect should the nurse anticipate?
A. A greater free-drug fraction and possible toxicity
B. A lower free-drug fraction
C. Complete loss of drug absorption
D. Immediate renal elimination of the entire dose
Answer: A. Rationale: Low albumin leaves fewer binding sites, increasing the unbound
pharmacologically active fraction of highly protein-bound drugs and potentially
increasing toxicity.
16. A patient develops acute kidney injury while taking a medication eliminated
primarily by the kidneys. What is the nurse's priority concern?
A. The drug will be absorbed more slowly from the stomach
B. The drug will become completely protein bound
C. The drug may accumulate and cause toxicity
D. The drug will no longer have any therapeutic effect
Answer: C. Rationale: Reduced renal clearance can prolong drug exposure and increase
serum concentrations, making accumulation and toxicity a major concern.
17. A drug has a long half-life. Which implication is most accurate?
A. It is always safer than a short-half-life drug
B. It cannot cause toxicity
C. It must be given intravenously
D. It generally takes longer to reach steady state and longer to be eliminated
Answer: D. Rationale: Longer half-life generally means slower accumulation to steady
state and slower decline after the drug is stopped.
18. Which statement best distinguishes potency from efficacy?
A. Potency is the amount needed for an effect; efficacy is the maximum effect a drug
can produce
B. Potency and efficacy mean exactly the same thing
C. Efficacy describes only absorption
D. Potency describes only toxicity
Answer: A. Rationale: Potency concerns how much drug is required to produce an
effect, whereas efficacy refers to the maximal effect the drug can achieve.
19. A medication has a narrow therapeutic index. Which nursing action is most
important?
A. Assume small dose changes are harmless
