RN Pharmacology A Relias Exam Questions | Verified Answers
with Detailed Rationales (2026/2027 Edition)
SECTION 1: Core Pharmacology Principles and Pharmacokinetics
1. A nurse is reviewing the pharmacokinetic process of a newly prescribed oral
medication. The nurse understands that the process by which a drug enters the
bloodstream from its site of administration is known as:
A. Distribution
B. Metabolism
C. Absorption
D. Excretion
Correct Answer: C
Rationale: Absorption is the process by which a drug moves from its site of
administration into the bloodstream. Distribution (A) refers to drug movement from
blood to tissues. Metabolism (B) is the chemical transformation of drugs, primarily in
the liver. Excretion (D) is the elimination of drugs from the body, primarily via the
kidneys.
2. A patient is prescribed a medication that undergoes extensive first-pass
metabolism in the liver. Which route of administration would be most appropriate
to bypass this effect and achieve higher bioavailability?
A. Oral
B. Intravenous
C. Subcutaneous
D. Transdermal
Correct Answer: B
Rationale: Intravenous administration delivers drugs directly into the bloodstream,
completely bypassing the first-pass hepatic metabolism that occurs with oral drugs.
,Oral (A) is most affected by first-pass metabolism. Subcutaneous (C) and transdermal
(D) bypass first-pass metabolism to some degree but IV provides 100% bioavailability.
3. A nurse is caring for a patient with renal impairment who is receiving a
medication primarily eliminated by the kidneys. The nurse should anticipate
which pharmacokinetic change?
A. Increased absorption of the drug from the GI tract
B. Decreased volume of distribution leading to lower drug levels
C. Prolonged half-life and increased risk of drug accumulation
D. Enhanced hepatic metabolism compensating for renal dysfunction
Correct Answer: C
Rationale: Renal impairment reduces drug excretion, leading to prolonged half-life and
drug accumulation. Absorption (A) is not directly affected by renal impairment. Volume
of distribution (B) may actually increase due to changes in protein binding and fluid
status. The liver does not compensate for renal dysfunction (D).
4. A nurse is teaching a patient about a medication that acts as a receptor
antagonist. Which statement best describes the mechanism of action of this
drug?
A. It binds to a receptor and produces a biological response.
B. It binds to a receptor and blocks or inhibits the action of an endogenous substance.
C. It increases the synthesis of neurotransmitters at the receptor site.
D. It requires full receptor occupancy to produce a graded response.
Correct Answer: B
Rationale: An antagonist binds to a receptor without activating it, thereby blocking the
action of agonists or endogenous substances. An agonist (A) produces a biological
response. Increasing neurotransmitter synthesis (C) is not the mechanism of an
antagonist. Graded responses (D) relate to dose-response relationships, not antagonist
classification.
, 5. A nurse is monitoring a patient receiving a medication with a narrow therapeutic
index. Which action is the priority for safe administration?
A. Administering the medication with food to enhance absorption
B. Monitoring serum drug levels and clinical signs of toxicity
C. Administering the medication at the patient's preferred time
D. Educating the patient about common but mild side effects only
Correct Answer: B
Rationale: Drugs with a narrow therapeutic index have a small margin between
therapeutic and toxic doses, requiring careful monitoring of serum drug levels and
clinical parameters. Food effects (A) are not the priority. Preferred timing (C) is not
relevant to safety. Patients must be educated about serious adverse effects, not just
mild ones (D).
6. A patient is taking warfarin and begins taking a medication that induces
cytochrome P450 enzymes. The nurse should monitor for which expected
outcome?
A. Increased risk of bleeding due to enhanced warfarin effect
B. Decreased anticoagulant effect due to increased warfarin metabolism
C. No change in warfarin levels because cytochrome P450 does not affect vitamin K
antagonists
D. Increased warfarin absorption from the gastrointestinal tract
Correct Answer: B
Rationale: Cytochrome P450 enzyme induction increases the metabolism of warfarin,
reducing its anticoagulant effect and potentially increasing clotting risk. Enzyme
inhibition, not induction, would increase bleeding risk (A). Cytochrome P450
significantly affects warfarin metabolism (C). Induction does not increase absorption
(D).
7. A nurse is reviewing a medication order for a drug that is highly protein-bound.
The patient has low serum albumin due to malnutrition. Which concern should
the nurse prioritize?
with Detailed Rationales (2026/2027 Edition)
SECTION 1: Core Pharmacology Principles and Pharmacokinetics
1. A nurse is reviewing the pharmacokinetic process of a newly prescribed oral
medication. The nurse understands that the process by which a drug enters the
bloodstream from its site of administration is known as:
A. Distribution
B. Metabolism
C. Absorption
D. Excretion
Correct Answer: C
Rationale: Absorption is the process by which a drug moves from its site of
administration into the bloodstream. Distribution (A) refers to drug movement from
blood to tissues. Metabolism (B) is the chemical transformation of drugs, primarily in
the liver. Excretion (D) is the elimination of drugs from the body, primarily via the
kidneys.
2. A patient is prescribed a medication that undergoes extensive first-pass
metabolism in the liver. Which route of administration would be most appropriate
to bypass this effect and achieve higher bioavailability?
A. Oral
B. Intravenous
C. Subcutaneous
D. Transdermal
Correct Answer: B
Rationale: Intravenous administration delivers drugs directly into the bloodstream,
completely bypassing the first-pass hepatic metabolism that occurs with oral drugs.
,Oral (A) is most affected by first-pass metabolism. Subcutaneous (C) and transdermal
(D) bypass first-pass metabolism to some degree but IV provides 100% bioavailability.
3. A nurse is caring for a patient with renal impairment who is receiving a
medication primarily eliminated by the kidneys. The nurse should anticipate
which pharmacokinetic change?
A. Increased absorption of the drug from the GI tract
B. Decreased volume of distribution leading to lower drug levels
C. Prolonged half-life and increased risk of drug accumulation
D. Enhanced hepatic metabolism compensating for renal dysfunction
Correct Answer: C
Rationale: Renal impairment reduces drug excretion, leading to prolonged half-life and
drug accumulation. Absorption (A) is not directly affected by renal impairment. Volume
of distribution (B) may actually increase due to changes in protein binding and fluid
status. The liver does not compensate for renal dysfunction (D).
4. A nurse is teaching a patient about a medication that acts as a receptor
antagonist. Which statement best describes the mechanism of action of this
drug?
A. It binds to a receptor and produces a biological response.
B. It binds to a receptor and blocks or inhibits the action of an endogenous substance.
C. It increases the synthesis of neurotransmitters at the receptor site.
D. It requires full receptor occupancy to produce a graded response.
Correct Answer: B
Rationale: An antagonist binds to a receptor without activating it, thereby blocking the
action of agonists or endogenous substances. An agonist (A) produces a biological
response. Increasing neurotransmitter synthesis (C) is not the mechanism of an
antagonist. Graded responses (D) relate to dose-response relationships, not antagonist
classification.
, 5. A nurse is monitoring a patient receiving a medication with a narrow therapeutic
index. Which action is the priority for safe administration?
A. Administering the medication with food to enhance absorption
B. Monitoring serum drug levels and clinical signs of toxicity
C. Administering the medication at the patient's preferred time
D. Educating the patient about common but mild side effects only
Correct Answer: B
Rationale: Drugs with a narrow therapeutic index have a small margin between
therapeutic and toxic doses, requiring careful monitoring of serum drug levels and
clinical parameters. Food effects (A) are not the priority. Preferred timing (C) is not
relevant to safety. Patients must be educated about serious adverse effects, not just
mild ones (D).
6. A patient is taking warfarin and begins taking a medication that induces
cytochrome P450 enzymes. The nurse should monitor for which expected
outcome?
A. Increased risk of bleeding due to enhanced warfarin effect
B. Decreased anticoagulant effect due to increased warfarin metabolism
C. No change in warfarin levels because cytochrome P450 does not affect vitamin K
antagonists
D. Increased warfarin absorption from the gastrointestinal tract
Correct Answer: B
Rationale: Cytochrome P450 enzyme induction increases the metabolism of warfarin,
reducing its anticoagulant effect and potentially increasing clotting risk. Enzyme
inhibition, not induction, would increase bleeding risk (A). Cytochrome P450
significantly affects warfarin metabolism (C). Induction does not increase absorption
(D).
7. A nurse is reviewing a medication order for a drug that is highly protein-bound.
The patient has low serum albumin due to malnutrition. Which concern should
the nurse prioritize?
