Nurs 615 Pharm Exam 2 Latest 2026 Actual
Exam 2026/2027 | Complete Exam-Style
Questions with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
---
## Pharmacokinetics and Pharmacodynamics: How Drugs Move Through and Act on the
Body
**Q1:** A newly approved oral tablet is known to undergo extensive first-pass metabolism
in the liver. What does this mean for the oral dose compared with the intravenous dose?
A. The oral dose must be lower because the liver concentrates the drug in the gut
B. The oral and IV doses should always be identical since it is the same drug
C. The oral dose must be higher than the IV dose to achieve comparable systemic
concentrations [CORRECT]
D. The oral dose should be given more frequently because food blocks absorption
Correct Answer: C
Rationale: The best answer is C — extensive first-pass metabolism destroys much of an oral
dose before it reaches systemic circulation, so a larger oral dose is needed to match IV
exposure. This is why bioavailability, not drug identity, drives the oral-versus-IV dose
difference.
**Q2:** J.R. is a 64-year-old well controlled on phenytoin. He is started on a new
medication that is also highly protein-bound. Which change in drug behavior should the NP
anticipate?
A. The total phenytoin level will fall with no risk of toxicity
B. Free (unbound) phenytoin levels may rise, increasing the risk of toxicity [CORRECT]
C. Both drugs will be eliminated faster through enhanced protein binding
D. Phenytoin will be absorbed more completely from the GI tract
Correct Answer: B
Rationale: This choice is correct because when two highly protein-bound drugs compete for
albumin binding sites, the displaced drug leaves more free, pharmacologically active drug
circulating, pushing effective levels toward toxicity even when the total level looks
unchanged. That is exactly why free drug levels matter in these situations.
**Q3:** A drug has a half-life of 12 hours. Approximately how long will it take to reach
steady-state plasma concentrations with regular dosing?
A. About 12 hours
B. About 24 hours
,C. About 48 to 60 hours [CORRECT]
D. About 7 to 10 days
Correct Answer: C
Rationale: The best answer is C — steady state is generally achieved after roughly four to
five half-lives, so a 12-hour half-life puts therapeutic steadiness at about two to two-and-a-
half days of consistent dosing. Any sooner than that, levels are still climbing.
**Q4:** A 55-year-old maintained on a stable warfarin regimen reports adding an over-the-
counter herbal supplement for low mood. Two weeks later her INR drops from 2.6 to 1.3.
Which supplement is the most likely culprit?
A. Vitamin C, because it blocks warfarin absorption in the intestine
B. Fish oil, because it binds warfarin in the plasma
C. Melatonin, because it speeds renal clearance of warfarin
D. St. John's wort, because it induces hepatic metabolism of warfarin [CORRECT]
Correct Answer: D
Rationale: This choice is correct because St. John's wort is a potent inducer of CYP450
enzymes, which accelerates warfarin metabolism and drops the INR, leaving the patient
dangerously under-anticoagulated. Herbals often get blamed for raising drug levels, but
inducers do the opposite.
**Q5:** A 79-year-old with a creatinine clearance of 28 mL/min needs treatment for
postherpetic neuralgia, and gabapentin is being considered. What adjustment is required
compared with a standard adult dose?
A. A lower dose with longer dosing intervals based on renal clearance [CORRECT]
B. No change, because gabapentin is cleared by the liver
C. A higher dose, because aging blunts receptor sensitivity
D. The standard dose taken with food to slow absorption
Correct Answer: A
Rationale: The best answer is A — gabapentin is eliminated almost entirely unchanged by
the kidneys, so a creatinine clearance of 28 mL/min demands both a dose reduction and
extended intervals to prevent accumulation, somnolence, and falls. Assuming liver-based
clearance would be a dangerous miss.
**Q6:** Which pair of medications is best described as having a narrow therapeutic index,
requiring close drug-level or laboratory monitoring?
A. Amoxicillin and metformin
B. Lisinopril and amlodipine
C. Lithium and digoxin [CORRECT]
D. Diphenhydramine and ibuprofen
Correct Answer: C
Rationale: This choice is correct because lithium and digoxin both have small margins
between therapeutic and toxic concentrations, so serum levels are tracked routinely. Most
antibiotics and antihypertensives carry wide safety margins and never need level
monitoring.
**Q7:** Buprenorphine is described as a partial mu-opioid agonist. What is the practical
meaning of this receptor action?
, A. It produces a full opioid effect identical to morphine
B. It blocks opioid receptors completely at any dose
C. It binds only to opioid receptors in the gastrointestinal tract
D. It activates opioid receptors with lower intrinsic activity, creating a ceiling effect on
respiratory depression [CORRECT]
Correct Answer: D
Rationale: The best answer is D — a partial agonist stimulates the receptor but with less
intrinsic activity than a full agonist, which places a ceiling on respiratory depression while
still easing withdrawal and cravings. That ceiling is precisely why buprenorphine is safer in
overdose than full agonists.
**Q8:** In a hypertension trial, Drug X lowers blood pressure at one-fifth the milligram
dose of Drug Y, but Drug Y produces a greater maximal blood pressure reduction at full
dosing. If the goal is the greatest possible blood pressure reduction in a patient with severe
hypertension, which selection is guided by the correct principle?
A. Drug X, because potency predicts clinical benefit
B. The drugs are interchangeable, since potency and efficacy mean the same thing
C. Neither drug, because both act at the same receptor
D. Drug Y, because efficacy, not potency, determines the maximal achievable effect
[CORRECT]
Correct Answer: D
Rationale: This choice is correct because efficacy describes the ceiling of a drug's effect,
which is what matters when maximal reduction is the goal, while potency only tells you the
dose needed to get there. Mixing up those two terms is one of the most common
pharmacodynamics pitfalls.
**Q9:** A patient's phenytoin level is 8 mcg/mL on 300 mg daily. The provider increases the
dose to 400 mg daily, and the repeat level returns at 26 mcg/mL with new nystagmus. What
pharmacokinetic principle explains this jump?
A. Phenytoin follows nonlinear, capacity-limited metabolism, so small dose increases can
produce disproportionate level rises [CORRECT]
B. Phenytoin loses bioavailability as doses increase
C. The dose change induced its own metabolism, lowering clearance
D. Phenytoin accumulates only in patients over age 65
Correct Answer: A
Rationale: The best answer is A — at therapeutic concentrations the enzymes clearing
phenytoin become saturated, shifting the drug from first-order to zero-order kinetics, where
even a modest dose increase can sharply raise serum levels. This is why phenytoin titration
happens in small, measured steps.
**Q10:** A 70-year-old with cirrhosis and a serum albumin of 2.1 g/dL has a total phenytoin
level of 6 mcg/mL but has had no seizure activity. How should the NP interpret this result?
A. The level confirms underdosing and the dose should be doubled
B. The sample was likely drawn during the absorption phase
C. Low albumin makes the total level misleading, so a free phenytoin level should be
measured [CORRECT]
D. Cirrhosis increases protein binding, artificially lowering total levels
Exam 2026/2027 | Complete Exam-Style
Questions with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
---
## Pharmacokinetics and Pharmacodynamics: How Drugs Move Through and Act on the
Body
**Q1:** A newly approved oral tablet is known to undergo extensive first-pass metabolism
in the liver. What does this mean for the oral dose compared with the intravenous dose?
A. The oral dose must be lower because the liver concentrates the drug in the gut
B. The oral and IV doses should always be identical since it is the same drug
C. The oral dose must be higher than the IV dose to achieve comparable systemic
concentrations [CORRECT]
D. The oral dose should be given more frequently because food blocks absorption
Correct Answer: C
Rationale: The best answer is C — extensive first-pass metabolism destroys much of an oral
dose before it reaches systemic circulation, so a larger oral dose is needed to match IV
exposure. This is why bioavailability, not drug identity, drives the oral-versus-IV dose
difference.
**Q2:** J.R. is a 64-year-old well controlled on phenytoin. He is started on a new
medication that is also highly protein-bound. Which change in drug behavior should the NP
anticipate?
A. The total phenytoin level will fall with no risk of toxicity
B. Free (unbound) phenytoin levels may rise, increasing the risk of toxicity [CORRECT]
C. Both drugs will be eliminated faster through enhanced protein binding
D. Phenytoin will be absorbed more completely from the GI tract
Correct Answer: B
Rationale: This choice is correct because when two highly protein-bound drugs compete for
albumin binding sites, the displaced drug leaves more free, pharmacologically active drug
circulating, pushing effective levels toward toxicity even when the total level looks
unchanged. That is exactly why free drug levels matter in these situations.
**Q3:** A drug has a half-life of 12 hours. Approximately how long will it take to reach
steady-state plasma concentrations with regular dosing?
A. About 12 hours
B. About 24 hours
,C. About 48 to 60 hours [CORRECT]
D. About 7 to 10 days
Correct Answer: C
Rationale: The best answer is C — steady state is generally achieved after roughly four to
five half-lives, so a 12-hour half-life puts therapeutic steadiness at about two to two-and-a-
half days of consistent dosing. Any sooner than that, levels are still climbing.
**Q4:** A 55-year-old maintained on a stable warfarin regimen reports adding an over-the-
counter herbal supplement for low mood. Two weeks later her INR drops from 2.6 to 1.3.
Which supplement is the most likely culprit?
A. Vitamin C, because it blocks warfarin absorption in the intestine
B. Fish oil, because it binds warfarin in the plasma
C. Melatonin, because it speeds renal clearance of warfarin
D. St. John's wort, because it induces hepatic metabolism of warfarin [CORRECT]
Correct Answer: D
Rationale: This choice is correct because St. John's wort is a potent inducer of CYP450
enzymes, which accelerates warfarin metabolism and drops the INR, leaving the patient
dangerously under-anticoagulated. Herbals often get blamed for raising drug levels, but
inducers do the opposite.
**Q5:** A 79-year-old with a creatinine clearance of 28 mL/min needs treatment for
postherpetic neuralgia, and gabapentin is being considered. What adjustment is required
compared with a standard adult dose?
A. A lower dose with longer dosing intervals based on renal clearance [CORRECT]
B. No change, because gabapentin is cleared by the liver
C. A higher dose, because aging blunts receptor sensitivity
D. The standard dose taken with food to slow absorption
Correct Answer: A
Rationale: The best answer is A — gabapentin is eliminated almost entirely unchanged by
the kidneys, so a creatinine clearance of 28 mL/min demands both a dose reduction and
extended intervals to prevent accumulation, somnolence, and falls. Assuming liver-based
clearance would be a dangerous miss.
**Q6:** Which pair of medications is best described as having a narrow therapeutic index,
requiring close drug-level or laboratory monitoring?
A. Amoxicillin and metformin
B. Lisinopril and amlodipine
C. Lithium and digoxin [CORRECT]
D. Diphenhydramine and ibuprofen
Correct Answer: C
Rationale: This choice is correct because lithium and digoxin both have small margins
between therapeutic and toxic concentrations, so serum levels are tracked routinely. Most
antibiotics and antihypertensives carry wide safety margins and never need level
monitoring.
**Q7:** Buprenorphine is described as a partial mu-opioid agonist. What is the practical
meaning of this receptor action?
, A. It produces a full opioid effect identical to morphine
B. It blocks opioid receptors completely at any dose
C. It binds only to opioid receptors in the gastrointestinal tract
D. It activates opioid receptors with lower intrinsic activity, creating a ceiling effect on
respiratory depression [CORRECT]
Correct Answer: D
Rationale: The best answer is D — a partial agonist stimulates the receptor but with less
intrinsic activity than a full agonist, which places a ceiling on respiratory depression while
still easing withdrawal and cravings. That ceiling is precisely why buprenorphine is safer in
overdose than full agonists.
**Q8:** In a hypertension trial, Drug X lowers blood pressure at one-fifth the milligram
dose of Drug Y, but Drug Y produces a greater maximal blood pressure reduction at full
dosing. If the goal is the greatest possible blood pressure reduction in a patient with severe
hypertension, which selection is guided by the correct principle?
A. Drug X, because potency predicts clinical benefit
B. The drugs are interchangeable, since potency and efficacy mean the same thing
C. Neither drug, because both act at the same receptor
D. Drug Y, because efficacy, not potency, determines the maximal achievable effect
[CORRECT]
Correct Answer: D
Rationale: This choice is correct because efficacy describes the ceiling of a drug's effect,
which is what matters when maximal reduction is the goal, while potency only tells you the
dose needed to get there. Mixing up those two terms is one of the most common
pharmacodynamics pitfalls.
**Q9:** A patient's phenytoin level is 8 mcg/mL on 300 mg daily. The provider increases the
dose to 400 mg daily, and the repeat level returns at 26 mcg/mL with new nystagmus. What
pharmacokinetic principle explains this jump?
A. Phenytoin follows nonlinear, capacity-limited metabolism, so small dose increases can
produce disproportionate level rises [CORRECT]
B. Phenytoin loses bioavailability as doses increase
C. The dose change induced its own metabolism, lowering clearance
D. Phenytoin accumulates only in patients over age 65
Correct Answer: A
Rationale: The best answer is A — at therapeutic concentrations the enzymes clearing
phenytoin become saturated, shifting the drug from first-order to zero-order kinetics, where
even a modest dose increase can sharply raise serum levels. This is why phenytoin titration
happens in small, measured steps.
**Q10:** A 70-year-old with cirrhosis and a serum albumin of 2.1 g/dL has a total phenytoin
level of 6 mcg/mL but has had no seizure activity. How should the NP interpret this result?
A. The level confirms underdosing and the dose should be doubled
B. The sample was likely drawn during the absorption phase
C. Low albumin makes the total level misleading, so a free phenytoin level should be
measured [CORRECT]
D. Cirrhosis increases protein binding, artificially lowering total levels
