NCLEX-RN Pharmacology Practice Questions |
Introduction to Pharmacology | 20 Original
NCLEX-Style MCQs with Rationales | Nursing
Exam Study Guide PDF
Question 1
Clinical Scenario
A 72-year-old female client with a history of chronic kidney
disease (CKD) Stage 4 is prescribed a new water-soluble
medication for a cardiovascular condition. During a medication
reconciliation, the nurse reviews her most recent laboratory
results, which reveal a blood urea nitrogen (BUN) of $42\text{
mg/dL}$, a serum creatinine of $2.4\text{ mg/dL}$, and an
estimated glomerular filtration rate (eGFR) of $28\text{
mL/min/1.73m}^2$. The nurse notes that the medication is
primarily eliminated unchanged via renal excretion.
Question Stem
,Based on the client's pharmacokinetic profile and laboratory
findings, which physiological process is altered, requiring a
modification of the medication dosage?
A. Absorption B. Distribution C. Metabolism D. Excretion
Correct Answer
Correct Answer: D. Excretion
Detailed Rationale
The correct answer is D. Excretion is the final stage of
pharmacokinetics and refers to the removal of drugs from the
body, primarily through the kidneys. This client has advanced
chronic kidney disease (Stage 4), as evidenced by an elevated
BUN ($42\text{ mg/dL}$), elevated serum creatinine ($2.4\text{
mg/dL}$), and a significantly reduced eGFR ($28\text{
mL/min/1.73m}^2$). Because the prescribed medication is
water-soluble and primarily eliminated unchanged by the
kidneys, a decreased glomerular filtration rate directly slows
down the rate of drug clearance. This alteration leads to
prolonged drug half-life, increased plasma concentrations, and
an elevated risk of cumulative drug toxicity. Therefore, the
dosage or frequency must be reduced.
• Option A is incorrect because drug absorption refers to the
movement of a drug from its site of administration into the
bloodstream. It is primarily influenced by gastric pH, GI
, motility, and surface area, which are not the primary issues
highlighted by these specific renal laboratory values.
• Option B is incorrect because distribution involves the
transport of the drug throughout the body via the
bloodstream to its site of action. It is heavily influenced by
blood flow, tissue affinity, and protein binding (e.g.,
albumin levels), not primarily by renal clearance.
• Option C is incorrect because metabolism
(biotransformation) is the enzymatic alteration of drug
structure, which occurs predominantly in the liver via the
cytochrome P450 system. While renal failure can subtly
impact some metabolic processes, the primary kinetic
alteration for an unchanged, renally excreted drug is
impaired excretion.
Learning Objective
After completing this question, the learner should be able to:
• Analyze laboratory values (BUN, creatinine, eGFR) to
evaluate renal function.
• Apply principles of pharmacokinetics to predict drug
accumulation in clients with renal impairment.
• Identify the clinical significance of impaired renal excretion
on medication safety and dosage modification.
Medication Safety Focus
, Monitoring
Question 2
Clinical Scenario
The nurse is preparing to administer morning medications to a
68-year-old male client admitted with acute decompensated
heart failure. The client's medication administration record
(MAR) includes furosemide, metoprolol succinate, lisinopril, and
digoxin. Prior to administration, the nurse performs a physical
assessment and reviews the electronic health record. The nurse
notes that the client’s current serum potassium level is
$3.2\text{ mEq/L}$ (normal: $3.5\text{-}5.0\text{ mEq/L}$) and
his apical pulse rate is 58 beats per minute.
Question Stem
Which action should the nurse take first?
A. Administer all medications as scheduled and reassess the
client in one hour. B. Hold the furosemide and lisinopril, but
administer the digoxin and metoprolol succinate. C. Hold the
digoxin and furosemide, and notify the healthcare provider of
the findings. D. Request a repeat serum potassium level from
the laboratory before taking further action.
Correct Answer
Correct Answer: C. Hold the digoxin and furosemide, and notify
the healthcare provider of the findings.
Introduction to Pharmacology | 20 Original
NCLEX-Style MCQs with Rationales | Nursing
Exam Study Guide PDF
Question 1
Clinical Scenario
A 72-year-old female client with a history of chronic kidney
disease (CKD) Stage 4 is prescribed a new water-soluble
medication for a cardiovascular condition. During a medication
reconciliation, the nurse reviews her most recent laboratory
results, which reveal a blood urea nitrogen (BUN) of $42\text{
mg/dL}$, a serum creatinine of $2.4\text{ mg/dL}$, and an
estimated glomerular filtration rate (eGFR) of $28\text{
mL/min/1.73m}^2$. The nurse notes that the medication is
primarily eliminated unchanged via renal excretion.
Question Stem
,Based on the client's pharmacokinetic profile and laboratory
findings, which physiological process is altered, requiring a
modification of the medication dosage?
A. Absorption B. Distribution C. Metabolism D. Excretion
Correct Answer
Correct Answer: D. Excretion
Detailed Rationale
The correct answer is D. Excretion is the final stage of
pharmacokinetics and refers to the removal of drugs from the
body, primarily through the kidneys. This client has advanced
chronic kidney disease (Stage 4), as evidenced by an elevated
BUN ($42\text{ mg/dL}$), elevated serum creatinine ($2.4\text{
mg/dL}$), and a significantly reduced eGFR ($28\text{
mL/min/1.73m}^2$). Because the prescribed medication is
water-soluble and primarily eliminated unchanged by the
kidneys, a decreased glomerular filtration rate directly slows
down the rate of drug clearance. This alteration leads to
prolonged drug half-life, increased plasma concentrations, and
an elevated risk of cumulative drug toxicity. Therefore, the
dosage or frequency must be reduced.
• Option A is incorrect because drug absorption refers to the
movement of a drug from its site of administration into the
bloodstream. It is primarily influenced by gastric pH, GI
, motility, and surface area, which are not the primary issues
highlighted by these specific renal laboratory values.
• Option B is incorrect because distribution involves the
transport of the drug throughout the body via the
bloodstream to its site of action. It is heavily influenced by
blood flow, tissue affinity, and protein binding (e.g.,
albumin levels), not primarily by renal clearance.
• Option C is incorrect because metabolism
(biotransformation) is the enzymatic alteration of drug
structure, which occurs predominantly in the liver via the
cytochrome P450 system. While renal failure can subtly
impact some metabolic processes, the primary kinetic
alteration for an unchanged, renally excreted drug is
impaired excretion.
Learning Objective
After completing this question, the learner should be able to:
• Analyze laboratory values (BUN, creatinine, eGFR) to
evaluate renal function.
• Apply principles of pharmacokinetics to predict drug
accumulation in clients with renal impairment.
• Identify the clinical significance of impaired renal excretion
on medication safety and dosage modification.
Medication Safety Focus
, Monitoring
Question 2
Clinical Scenario
The nurse is preparing to administer morning medications to a
68-year-old male client admitted with acute decompensated
heart failure. The client's medication administration record
(MAR) includes furosemide, metoprolol succinate, lisinopril, and
digoxin. Prior to administration, the nurse performs a physical
assessment and reviews the electronic health record. The nurse
notes that the client’s current serum potassium level is
$3.2\text{ mEq/L}$ (normal: $3.5\text{-}5.0\text{ mEq/L}$) and
his apical pulse rate is 58 beats per minute.
Question Stem
Which action should the nurse take first?
A. Administer all medications as scheduled and reassess the
client in one hour. B. Hold the furosemide and lisinopril, but
administer the digoxin and metoprolol succinate. C. Hold the
digoxin and furosemide, and notify the healthcare provider of
the findings. D. Request a repeat serum potassium level from
the laboratory before taking further action.
Correct Answer
Correct Answer: C. Hold the digoxin and furosemide, and notify
the healthcare provider of the findings.
