PHARM NUR 210 GALEN EXAM 3 2026/2027 | 100% Correct
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Principles | Medication Administration | Drug Classifications |
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Unit 1: Pharmacokinetics & Pharmacodynamics (15 Questions)
Q1: A 68-year-old patient with chronic kidney disease (CKD) stage 4 is prescribed
gentamicin for a severe infection. The nurse knows that gentamicin has a narrow
therapeutic index and is primarily renally eliminated. Which nursing consideration is the
priority to prevent toxicity?
A. Monitor liver function tests weekly due to hepatic metabolism of the drug
B. Obtain peak and trough levels and monitor renal function closely to adjust dosing
C. Increase the maintenance dose to compensate for reduced renal clearance
D. Administer the medication with food to enhance gastrointestinal absorption
Correct Answer: B
Rationale: Gentamicin is an aminoglycoside antibiotic that is primarily eliminated
unchanged by the kidneys via glomerular filtration. [CORRECT] In CKD stage 4, renal
clearance is significantly reduced (GFR 15-29 mL/min), leading to drug accumulation
and increased risk of nephrotoxicity and ototoxicity. Peak levels (drawn 30 minutes after
infusion) ensure therapeutic efficacy, while trough levels (drawn immediately before
,next dose) detect accumulation. Therapeutic drug monitoring with dose adjustment
based on renal function is essential for narrow therapeutic index drugs.
Why other options are incorrect:
● A: Gentamicin is not hepatically metabolized; liver function tests are irrelevant for
this drug's pharmacokinetics.
● C: Increasing the dose in renal impairment causes severe toxicity; dose reduction
or interval extension is required.
● D: Gentamicin is administered IV and has minimal oral absorption; food does not
affect parenteral administration.
Q2: A patient is prescribed warfarin 5 mg daily for atrial fibrillation. The nurse explains
that the drug's effect is measured by the International Normalized Ratio (INR) and that
steady state is typically reached in 5-7 days. Which pharmacokinetic principle explains
why warfarin takes several days to reach steady state?
A. Warfarin undergoes extensive first-pass metabolism in the liver
B. Warfarin has a long half-life of approximately 40 hours
C. Warfarin is highly protein-bound and requires displacement from albumin
D. Warfarin is administered as a prodrug requiring hepatic activation
Correct Answer: B
Rationale: Steady state is reached after approximately 4-5 half-lives of a drug.
[CORRECT] Warfarin has a half-life of 36-42 hours (R-warfarin) and 6-8 hours
(S-warfarin, more potent). The effective half-life is approximately 40 hours. Therefore,
,4-5 half-lives = 160-200 hours (6.5-8 days) to reach steady state. This explains the
delayed onset of full anticoagulant effect and the need for bridging therapy with heparin
in acute situations.
Why other options are incorrect:
● A: First-pass metabolism affects bioavailability, not time to steady state; warfarin
has high oral bioavailability.
● C: Protein binding (99%) affects free drug concentration and drug interactions,
not time to steady state.
● D: Warfarin is not a prodrug; it is active as administered and undergoes hepatic
metabolism to inactive metabolites.
Q3: A nurse is teaching a patient about sublingual nitroglycerin for angina. The patient
asks why the medication is placed under the tongue rather than swallowed. Which
explanation best describes the pharmacokinetic advantage of the sublingual route?
A. Sublingual administration avoids first-pass hepatic metabolism, allowing rapid
systemic absorption
B. Sublingual administration increases the drug's half-life, prolonging its therapeutic
effect
C. Sublingual administration enhances renal excretion, reducing systemic toxicity
D. Sublingual administration stimulates gastric acid secretion, improving drug
dissolution
Correct Answer: A
, Rationale: The sublingual route bypasses the portal circulation and first-pass hepatic
metabolism. [CORRECT] Nitroglycerin has extensive first-pass metabolism (oral
bioavailability <1%), making oral administration ineffective. Sublingual administration
allows direct absorption into the systemic circulation via the rich venous plexus under
the tongue, achieving therapeutic blood levels within 1-2 minutes for rapid angina relief.
This is critical for acute angina attacks requiring immediate vasodilation.
Why other options are incorrect:
● B: Sublingual administration does not alter half-life; nitroglycerin has a short
half-life (1-4 minutes) regardless of route.
● C: Renal excretion is not affected by route of administration; this statement is
pharmacologically nonsensical.
● D: Gastric acid secretion is irrelevant for sublingual administration, which
bypasses the GI tract entirely.
Q4: A patient with liver cirrhosis is prescribed lorazepam for anxiety. The nurse knows
that lorazepam is metabolized via glucuronidation rather than oxidation by CYP450
enzymes. Which statement best explains the clinical significance of this metabolic
pathway in liver disease?
A. Glucuronidation is typically preserved in liver disease, making lorazepam safer than
drugs metabolized by oxidation
B. Glucuronidation is severely impaired in cirrhosis, requiring dose reduction of
lorazepam
C. Glucuronidation increases the risk of active metabolite accumulation in liver disease
D. Glucuronidation requires functioning bile ducts for drug elimination
Answers with Complete Solutions | Pharmacological
Principles | Medication Administration | Drug Classifications |
Pass Guaranteed - A+ Graded
Unit 1: Pharmacokinetics & Pharmacodynamics (15 Questions)
Q1: A 68-year-old patient with chronic kidney disease (CKD) stage 4 is prescribed
gentamicin for a severe infection. The nurse knows that gentamicin has a narrow
therapeutic index and is primarily renally eliminated. Which nursing consideration is the
priority to prevent toxicity?
A. Monitor liver function tests weekly due to hepatic metabolism of the drug
B. Obtain peak and trough levels and monitor renal function closely to adjust dosing
C. Increase the maintenance dose to compensate for reduced renal clearance
D. Administer the medication with food to enhance gastrointestinal absorption
Correct Answer: B
Rationale: Gentamicin is an aminoglycoside antibiotic that is primarily eliminated
unchanged by the kidneys via glomerular filtration. [CORRECT] In CKD stage 4, renal
clearance is significantly reduced (GFR 15-29 mL/min), leading to drug accumulation
and increased risk of nephrotoxicity and ototoxicity. Peak levels (drawn 30 minutes after
infusion) ensure therapeutic efficacy, while trough levels (drawn immediately before
,next dose) detect accumulation. Therapeutic drug monitoring with dose adjustment
based on renal function is essential for narrow therapeutic index drugs.
Why other options are incorrect:
● A: Gentamicin is not hepatically metabolized; liver function tests are irrelevant for
this drug's pharmacokinetics.
● C: Increasing the dose in renal impairment causes severe toxicity; dose reduction
or interval extension is required.
● D: Gentamicin is administered IV and has minimal oral absorption; food does not
affect parenteral administration.
Q2: A patient is prescribed warfarin 5 mg daily for atrial fibrillation. The nurse explains
that the drug's effect is measured by the International Normalized Ratio (INR) and that
steady state is typically reached in 5-7 days. Which pharmacokinetic principle explains
why warfarin takes several days to reach steady state?
A. Warfarin undergoes extensive first-pass metabolism in the liver
B. Warfarin has a long half-life of approximately 40 hours
C. Warfarin is highly protein-bound and requires displacement from albumin
D. Warfarin is administered as a prodrug requiring hepatic activation
Correct Answer: B
Rationale: Steady state is reached after approximately 4-5 half-lives of a drug.
[CORRECT] Warfarin has a half-life of 36-42 hours (R-warfarin) and 6-8 hours
(S-warfarin, more potent). The effective half-life is approximately 40 hours. Therefore,
,4-5 half-lives = 160-200 hours (6.5-8 days) to reach steady state. This explains the
delayed onset of full anticoagulant effect and the need for bridging therapy with heparin
in acute situations.
Why other options are incorrect:
● A: First-pass metabolism affects bioavailability, not time to steady state; warfarin
has high oral bioavailability.
● C: Protein binding (99%) affects free drug concentration and drug interactions,
not time to steady state.
● D: Warfarin is not a prodrug; it is active as administered and undergoes hepatic
metabolism to inactive metabolites.
Q3: A nurse is teaching a patient about sublingual nitroglycerin for angina. The patient
asks why the medication is placed under the tongue rather than swallowed. Which
explanation best describes the pharmacokinetic advantage of the sublingual route?
A. Sublingual administration avoids first-pass hepatic metabolism, allowing rapid
systemic absorption
B. Sublingual administration increases the drug's half-life, prolonging its therapeutic
effect
C. Sublingual administration enhances renal excretion, reducing systemic toxicity
D. Sublingual administration stimulates gastric acid secretion, improving drug
dissolution
Correct Answer: A
, Rationale: The sublingual route bypasses the portal circulation and first-pass hepatic
metabolism. [CORRECT] Nitroglycerin has extensive first-pass metabolism (oral
bioavailability <1%), making oral administration ineffective. Sublingual administration
allows direct absorption into the systemic circulation via the rich venous plexus under
the tongue, achieving therapeutic blood levels within 1-2 minutes for rapid angina relief.
This is critical for acute angina attacks requiring immediate vasodilation.
Why other options are incorrect:
● B: Sublingual administration does not alter half-life; nitroglycerin has a short
half-life (1-4 minutes) regardless of route.
● C: Renal excretion is not affected by route of administration; this statement is
pharmacologically nonsensical.
● D: Gastric acid secretion is irrelevant for sublingual administration, which
bypasses the GI tract entirely.
Q4: A patient with liver cirrhosis is prescribed lorazepam for anxiety. The nurse knows
that lorazepam is metabolized via glucuronidation rather than oxidation by CYP450
enzymes. Which statement best explains the clinical significance of this metabolic
pathway in liver disease?
A. Glucuronidation is typically preserved in liver disease, making lorazepam safer than
drugs metabolized by oxidation
B. Glucuronidation is severely impaired in cirrhosis, requiring dose reduction of
lorazepam
C. Glucuronidation increases the risk of active metabolite accumulation in liver disease
D. Glucuronidation requires functioning bile ducts for drug elimination
