NRG 200 MIDTERM EXAM PHARMACOLOGY FOR HUMAN
CARING NURSING COMPREHENSIVE | 50 QUESTIONS WITH
ANSWERS AND RATIONALES | NEWLY UPDATED 2026/27
SECTION A: PHARMACOKINETICS & PHARMACODYNAMICS
Question 1
A patient is prescribed a medication with a narrow therapeutic index. Which
nursing action is most important?
• □
A. Administer the medication with food
• □
B. Monitor the patient for therapeutic response
• ☑
C. Monitor serum drug levels regularly
• □
D. Assess for allergic reactions
Correct Answer: C. Monitor serum drug levels regularly
Expert Rationale: A narrow therapeutic index means there is a small margin
between the minimum effective concentration and the toxic concentration. Drugs
with a narrow therapeutic range (e.g., digoxin, lithium, phenytoin, warfarin)
require regular monitoring of serum levels to ensure therapeutic efficacy while
avoiding toxicity. Monitoring serum levels allows for dose adjustments based on
the patient's individual pharmacokinetics, preventing adverse effects and ensuring
safety.
,Question 2
The nurse is teaching a patient about drug metabolism. Which statement
indicates the patient understands the role of the liver in drug metabolism?
• □
A. "The liver stores medications for later use."
• ☑
B. "The liver breaks down medications so they can be eliminated."
• □
C. "The liver increases the absorption of medications."
• □
D. "The liver distributes medications to the tissues."
Correct Answer: B. "The liver breaks down medications so they can be
eliminated."
Expert Rationale: The liver is the primary site of drug metabolism
(biotransformation), where medications are broken down into metabolites that
are more water-soluble and can be excreted by the kidneys. The cytochrome P450
(CYP450) enzyme system is responsible for metabolizing many drugs. Impaired
liver function can lead to drug accumulation and toxicity. Understanding the liver's
role in metabolism is essential for anticipating drug interactions and potential
adverse effects.
Question 3
A patient is receiving an intravenous medication that is highly protein-bound.
Which factor would most likely increase the risk of drug toxicity?
• □
A. Decreased renal function
, • □
B. Increased liver function
• ☑
C. Concurrent administration of another protein-bound drug
• □
D. Administration with food
Correct Answer: C. Concurrent administration of another protein-bound drug
Expert Rationale: Highly protein-bound drugs bind to plasma proteins
(primarily albumin). When two drugs that are highly protein-bound are
administered concurrently, they compete for binding sites, leading to
displacement of one drug and increased free (unbound) drug concentration. The
free drug is pharmacologically active and can cause toxicity. Patients with low
albumin levels (malnutrition, liver disease) are also at increased risk for toxicity.
Question 4
A patient asks the nurse why a medication is prescribed to be taken "three times
daily." The nurse explains that this is based on which pharmacokinetic principle?
• □
A. Bioavailability
• □
B. Protein binding
• ☑
C. Drug half-life
• □
D. First-pass effect
Correct Answer: C. Drug half-life
, Expert Rationale: Drug half-life is the time required for the body to eliminate
half of the drug. Dosing frequency is determined by the drug's half-life to maintain
therapeutic levels without allowing the drug level to drop below the minimum
effective concentration. Drugs with short half-lives require more frequent dosing,
while drugs with long half-lives can be given once daily. Understanding half-life
helps patients adhere to prescribed dosing schedules and recognize the
importance of consistent timing.
Question 5
A patient is started on a new medication that undergoes extensive first-pass
metabolism. The nurse anticipates that this medication will likely be
administered by which route?
• □
A. Oral
• ☑
B. Intravenous
• □
C. Subcutaneous
• □
D. Topical
Correct Answer: B. Intravenous
Expert Rationale: The first-pass effect refers to the metabolism of a drug in the
liver before it reaches systemic circulation when given orally. Drugs with extensive
first-pass metabolism have low oral bioavailability, requiring higher oral doses. To
avoid first-pass metabolism, these drugs are often administered parenterally
(intravenously, intramuscularly, sublingually, or transdermally). The IV route
delivers the drug directly into the systemic circulation, bypassing the liver's initial
metabolism.
CARING NURSING COMPREHENSIVE | 50 QUESTIONS WITH
ANSWERS AND RATIONALES | NEWLY UPDATED 2026/27
SECTION A: PHARMACOKINETICS & PHARMACODYNAMICS
Question 1
A patient is prescribed a medication with a narrow therapeutic index. Which
nursing action is most important?
• □
A. Administer the medication with food
• □
B. Monitor the patient for therapeutic response
• ☑
C. Monitor serum drug levels regularly
• □
D. Assess for allergic reactions
Correct Answer: C. Monitor serum drug levels regularly
Expert Rationale: A narrow therapeutic index means there is a small margin
between the minimum effective concentration and the toxic concentration. Drugs
with a narrow therapeutic range (e.g., digoxin, lithium, phenytoin, warfarin)
require regular monitoring of serum levels to ensure therapeutic efficacy while
avoiding toxicity. Monitoring serum levels allows for dose adjustments based on
the patient's individual pharmacokinetics, preventing adverse effects and ensuring
safety.
,Question 2
The nurse is teaching a patient about drug metabolism. Which statement
indicates the patient understands the role of the liver in drug metabolism?
• □
A. "The liver stores medications for later use."
• ☑
B. "The liver breaks down medications so they can be eliminated."
• □
C. "The liver increases the absorption of medications."
• □
D. "The liver distributes medications to the tissues."
Correct Answer: B. "The liver breaks down medications so they can be
eliminated."
Expert Rationale: The liver is the primary site of drug metabolism
(biotransformation), where medications are broken down into metabolites that
are more water-soluble and can be excreted by the kidneys. The cytochrome P450
(CYP450) enzyme system is responsible for metabolizing many drugs. Impaired
liver function can lead to drug accumulation and toxicity. Understanding the liver's
role in metabolism is essential for anticipating drug interactions and potential
adverse effects.
Question 3
A patient is receiving an intravenous medication that is highly protein-bound.
Which factor would most likely increase the risk of drug toxicity?
• □
A. Decreased renal function
, • □
B. Increased liver function
• ☑
C. Concurrent administration of another protein-bound drug
• □
D. Administration with food
Correct Answer: C. Concurrent administration of another protein-bound drug
Expert Rationale: Highly protein-bound drugs bind to plasma proteins
(primarily albumin). When two drugs that are highly protein-bound are
administered concurrently, they compete for binding sites, leading to
displacement of one drug and increased free (unbound) drug concentration. The
free drug is pharmacologically active and can cause toxicity. Patients with low
albumin levels (malnutrition, liver disease) are also at increased risk for toxicity.
Question 4
A patient asks the nurse why a medication is prescribed to be taken "three times
daily." The nurse explains that this is based on which pharmacokinetic principle?
• □
A. Bioavailability
• □
B. Protein binding
• ☑
C. Drug half-life
• □
D. First-pass effect
Correct Answer: C. Drug half-life
, Expert Rationale: Drug half-life is the time required for the body to eliminate
half of the drug. Dosing frequency is determined by the drug's half-life to maintain
therapeutic levels without allowing the drug level to drop below the minimum
effective concentration. Drugs with short half-lives require more frequent dosing,
while drugs with long half-lives can be given once daily. Understanding half-life
helps patients adhere to prescribed dosing schedules and recognize the
importance of consistent timing.
Question 5
A patient is started on a new medication that undergoes extensive first-pass
metabolism. The nurse anticipates that this medication will likely be
administered by which route?
• □
A. Oral
• ☑
B. Intravenous
• □
C. Subcutaneous
• □
D. Topical
Correct Answer: B. Intravenous
Expert Rationale: The first-pass effect refers to the metabolism of a drug in the
liver before it reaches systemic circulation when given orally. Drugs with extensive
first-pass metabolism have low oral bioavailability, requiring higher oral doses. To
avoid first-pass metabolism, these drugs are often administered parenterally
(intravenously, intramuscularly, sublingually, or transdermally). The IV route
delivers the drug directly into the systemic circulation, bypassing the liver's initial
metabolism.
