NURS 615 PHARM 3 EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A |LATEST EXAM UPDATE 2026/2027
SECTION ONE: QUESTIONS 1–100
1. A 65-year-old patient with heart failure and cirrhosis is prescribed a new medication with high protein
binding. Which pharmacokinetic change should the prescriber anticipate?
A. Decreased volume of distribution
B. Increased free drug concentration
C. Reduced hepatic metabolism
D. Enhanced renal excretion
🟢 B. Increased free drug concentration
🔴 RATIONALE: Cirrhosis reduces albumin synthesis in the liver, leading to fewer binding sites for highly
protein-bound drugs. This increases the free (active) drug concentration, raising both efficacy and toxicity risk.
2. A patient with a CYP2D6 poor metabolizer phenotype is prescribed codeine for post-surgical pain. What
outcome is most likely?
A. Enhanced analgesic effect
B. Increased risk of toxicity
C. Minimal analgesic benefit
D. Prolonged duration of action
🟢 C. Minimal analgesic benefit
🔴 RATIONALE: Codeine is a prodrug that requires conversion to its active metabolite, morphine, via the
,CYP2D6 enzyme. Poor metabolizers lack this enzyme activity, resulting in minimal analgesic benefit.
3. A patient prescribed a drug that follows first-order elimination kinetics will demonstrate which
characteristic?
A. Constant amount eliminated per unit time
B. Elimination rate proportional to drug concentration
C. Zero drug detected after two half-lives
D. Saturation of metabolic pathways at therapeutic doses
🟢 B. Elimination rate proportional to drug concentration
🔴 RATIONALE: In first-order kinetics, a constant fraction of the drug is eliminated per unit time, and the
elimination rate is directly proportional to the drug concentration. Zero-order kinetics (e.g., phenytoin) involves
a constant amount eliminated per unit time.
4. A patient is receiving IV phenytoin for status epilepticus at an infusion rate exceeding 50 mg/min. Which
adverse effect is most concerning?
A. Nystagmus
B. Hypotension and bradyarrhythmia
C. Gingival hyperplasia
D. Stevens-Johnson syndrome
🟢 B. Hypotension and bradyarrhythmia
🔴 RATIONALE: Rapid IV administration of phenytoin can cause myocardial depression, hypotension, and
bradyarrhythmias, likely due to the propylene glycol vehicle and direct cardiac effects. The maximum infusion
rate is 50 mg/min to prevent these serious adverse effects.
,5. A patient taking warfarin starts taking amiodarone, and the INR increases from 2.5 to 6.5. What is the
primary mechanism for this interaction?
A. Displacement from albumin plus inhibition of warfarin metabolism
B. Additive anticoagulant effect
C. Enhanced warfarin absorption
D. Reduced vitamin K intake
🟢 A. Displacement from albumin plus inhibition of warfarin metabolism
🔴 RATIONALE: Amiodarone displaces warfarin from plasma proteins (transient effect) and inhibits CYP2C9, the
enzyme responsible for metabolizing the more active S-enantiomer of warfarin. This leads to a significant and
potentially dangerous elevation in INR.
6. A drug with a half-life of 4 hours is administered intravenously. Approximately how long until steady state
is reached?
A. 8 hours
B. 12 hours
C. 20 hours
D. 24 hours
🟢 C. 20 hours
🔴 RATIONALE: Steady state is generally achieved after approximately five half-lives of drug administration. For
a drug with a 4-hour half-life, steady state is reached in about 20 hours (5 x 4 hours).
7. Which drug interaction mechanism is primarily responsible for grapefruit juice increasing the levels of
simvastatin?
, A. Inhibition of CYP3A4 in the gut wall
B. Induction of P-glycoprotein
C. Competition for renal tubular secretion
D. Displacement from plasma proteins
🟢 A. Inhibition of CYP3A4 in the gut wall
🔴 RATIONALE: Grapefruit juice irreversibly inhibits intestinal CYP3A4, reducing the presystemic metabolism
(first-pass effect) of simvastatin. This leads to significantly higher serum levels of the drug and an increased risk
of myopathy and rhabdomyolysis.
8. A patient is prescribed a medication that is a weak acid with a pKa of 4.5. In which body fluid would the
drug be most highly ionized and thus poorly reabsorbed?
A. Stomach fluid (pH 1.5)
B. Urine (pH 5.5)
C. Blood (pH 7.4)
D. Urine (pH 8.5)
🟢 D. Urine (pH 8.5)
🔴 RATIONALE: Weak acids are better ionized (and less reabsorbed) in an alkaline environment. At a pH of 8.5,
which is more alkaline than the drug's pKa, a weak acid will be predominantly in its ionized form, making it less
likely to cross cell membranes and be reabsorbed.
9. A patient with epilepsy on valproic acid develops hepatic dysfunction. Which alternative agent has the
least potential for hepatotoxicity?
2026 Q&A |LATEST EXAM UPDATE 2026/2027
SECTION ONE: QUESTIONS 1–100
1. A 65-year-old patient with heart failure and cirrhosis is prescribed a new medication with high protein
binding. Which pharmacokinetic change should the prescriber anticipate?
A. Decreased volume of distribution
B. Increased free drug concentration
C. Reduced hepatic metabolism
D. Enhanced renal excretion
🟢 B. Increased free drug concentration
🔴 RATIONALE: Cirrhosis reduces albumin synthesis in the liver, leading to fewer binding sites for highly
protein-bound drugs. This increases the free (active) drug concentration, raising both efficacy and toxicity risk.
2. A patient with a CYP2D6 poor metabolizer phenotype is prescribed codeine for post-surgical pain. What
outcome is most likely?
A. Enhanced analgesic effect
B. Increased risk of toxicity
C. Minimal analgesic benefit
D. Prolonged duration of action
🟢 C. Minimal analgesic benefit
🔴 RATIONALE: Codeine is a prodrug that requires conversion to its active metabolite, morphine, via the
,CYP2D6 enzyme. Poor metabolizers lack this enzyme activity, resulting in minimal analgesic benefit.
3. A patient prescribed a drug that follows first-order elimination kinetics will demonstrate which
characteristic?
A. Constant amount eliminated per unit time
B. Elimination rate proportional to drug concentration
C. Zero drug detected after two half-lives
D. Saturation of metabolic pathways at therapeutic doses
🟢 B. Elimination rate proportional to drug concentration
🔴 RATIONALE: In first-order kinetics, a constant fraction of the drug is eliminated per unit time, and the
elimination rate is directly proportional to the drug concentration. Zero-order kinetics (e.g., phenytoin) involves
a constant amount eliminated per unit time.
4. A patient is receiving IV phenytoin for status epilepticus at an infusion rate exceeding 50 mg/min. Which
adverse effect is most concerning?
A. Nystagmus
B. Hypotension and bradyarrhythmia
C. Gingival hyperplasia
D. Stevens-Johnson syndrome
🟢 B. Hypotension and bradyarrhythmia
🔴 RATIONALE: Rapid IV administration of phenytoin can cause myocardial depression, hypotension, and
bradyarrhythmias, likely due to the propylene glycol vehicle and direct cardiac effects. The maximum infusion
rate is 50 mg/min to prevent these serious adverse effects.
,5. A patient taking warfarin starts taking amiodarone, and the INR increases from 2.5 to 6.5. What is the
primary mechanism for this interaction?
A. Displacement from albumin plus inhibition of warfarin metabolism
B. Additive anticoagulant effect
C. Enhanced warfarin absorption
D. Reduced vitamin K intake
🟢 A. Displacement from albumin plus inhibition of warfarin metabolism
🔴 RATIONALE: Amiodarone displaces warfarin from plasma proteins (transient effect) and inhibits CYP2C9, the
enzyme responsible for metabolizing the more active S-enantiomer of warfarin. This leads to a significant and
potentially dangerous elevation in INR.
6. A drug with a half-life of 4 hours is administered intravenously. Approximately how long until steady state
is reached?
A. 8 hours
B. 12 hours
C. 20 hours
D. 24 hours
🟢 C. 20 hours
🔴 RATIONALE: Steady state is generally achieved after approximately five half-lives of drug administration. For
a drug with a 4-hour half-life, steady state is reached in about 20 hours (5 x 4 hours).
7. Which drug interaction mechanism is primarily responsible for grapefruit juice increasing the levels of
simvastatin?
, A. Inhibition of CYP3A4 in the gut wall
B. Induction of P-glycoprotein
C. Competition for renal tubular secretion
D. Displacement from plasma proteins
🟢 A. Inhibition of CYP3A4 in the gut wall
🔴 RATIONALE: Grapefruit juice irreversibly inhibits intestinal CYP3A4, reducing the presystemic metabolism
(first-pass effect) of simvastatin. This leads to significantly higher serum levels of the drug and an increased risk
of myopathy and rhabdomyolysis.
8. A patient is prescribed a medication that is a weak acid with a pKa of 4.5. In which body fluid would the
drug be most highly ionized and thus poorly reabsorbed?
A. Stomach fluid (pH 1.5)
B. Urine (pH 5.5)
C. Blood (pH 7.4)
D. Urine (pH 8.5)
🟢 D. Urine (pH 8.5)
🔴 RATIONALE: Weak acids are better ionized (and less reabsorbed) in an alkaline environment. At a pH of 8.5,
which is more alkaline than the drug's pKa, a weak acid will be predominantly in its ionized form, making it less
likely to cross cell membranes and be reabsorbed.
9. A patient with epilepsy on valproic acid develops hepatic dysfunction. Which alternative agent has the
least potential for hepatotoxicity?
