NUR2407 / NUR 2407: Pharmacology Exam 1
Latest Update 2026/2027 | Rasmussen College |
100% Correct | Grade A
Verified Questions & Answers with Rationales
Section 1: Pharmacokinetics and Pharmacodynamics (10 questions)
1. A patient is prescribed a medication that has a high first-pass effect. The nurse expects that
which of the following will be prescribed?
A) A higher oral dose to achieve the desired therapeutic effect
B) A lower oral dose to prevent toxicity
C) An intramuscular injection to slow absorption
D) A sublingual administration to enhance metabolism
[CORRECT] A) A higher oral dose to achieve the desired therapeutic effect
Rationale: The first-pass effect significantly reduces the concentration of an active drug after it
is absorbed through the gastrointestinal tract and metabolized by the liver before reaching
systemic circulation. Therefore, a higher oral dose is often required to ensure enough of the
active drug reaches the target tissues.
2. A nurse is administering a medication with a half-life of 4 hours. The medication was given at
0800. At what time will the drug reach approximately 25% of its peak initial concentration?
A) 1200
B) 1400
C) 1600
D) 1800
[CORRECT] C) 1600
,Rationale: A half-life is the time required for the plasma concentration of a drug to decrease by
50%. At 1200 (4 hours), it will be at 50%. At 1600 (8 hours, or two half-lives), it will be at 25%
of the initial peak concentration.
3. [MECHANISM OF ACTION] A patient is receiving a competitive antagonist medication.
Which of the following best describes the mechanism of action of this drug?
A) It binds to the receptor and activates it, producing a maximal response.
B) It binds to the receptor site and blocks the action of the endogenous agonist.
C) It binds to a different site on the receptor to enhance the agonist's effect.
D) It destroys the receptor, preventing any future agonist binding.
[CORRECT] B) It binds to the receptor site and blocks the action of the endogenous agonist.
Rationale: A competitive antagonist competes directly with agonists for the same receptor
binding sites. By occupying the receptor without activating it, it prevents the natural agonist from
exerting its physiological effect.
4. A patient with liver cirrhosis is prescribed a highly protein-bound drug (95%). The nurse
assesses the patient for signs of toxicity. Which pharmacokinetic principle explains this risk?
A) Decreased first-pass effect leading to rapid absorption
B) Increased free (unbound) drug circulating in the bloodstream
C) Decreased renal excretion due to altered glomerular filtration
D) Increased lipid solubility causing accumulation in adipose tissue
[CORRECT] B) Increased free (unbound) drug circulating in the bloodstream
Rationale: Liver cirrhosis often leads to hypoalbuminemia (decreased plasma proteins). Highly
protein-bound drugs rely on albumin to stay inactive in the blood; with fewer proteins available,
more of the drug remains free, increasing the risk of pharmacological toxicity.
5. A nurse is reviewing the medication profile of a patient with severe renal impairment. Which
pharmacokinetic process will most likely be affected?
A) Absorption
B) Distribution
, C) Metabolism
D) Excretion
[CORRECT] D) Excretion
Rationale: The kidneys are the primary organs responsible for the excretion of many drugs and
their metabolites. Severe renal impairment directly hinders the body's ability to clear these
substances, leading to drug accumulation and potential toxicity.
6. [MECHANISM OF ACTION] A patient is taking a drug with a very narrow therapeutic index.
What is the primary pharmacodynamic implication of this?
A) The drug has a wide margin of safety between the effective dose and toxic dose.
B) The drug requires extensive hepatic metabolism to become active.
C) Small changes in drug dose or blood levels can easily lead to toxicity or subtherapeutic
effects.
D) The drug binds irreversibly to receptors, requiring high doses for effect.
[CORRECT] C) Small changes in drug dose or blood levels can easily lead to toxicity or
subtherapeutic effects.
Rationale: A narrow therapeutic index means the difference between the minimum effective
concentration and the minimum toxic concentration is very small. This requires precise dosing
and frequent serum drug monitoring to prevent harm.
7. A patient taking warfarin (a CYP450 substrate) is prescribed phenobarbital (a CYP450
inducer). What clinical outcome should the nurse anticipate?
A) Increased risk of bleeding
B) Decreased effectiveness of warfarin
C) Increased risk of phenobarbital toxicity
D) No significant drug interaction
[CORRECT] B) Decreased effectiveness of warfarin
Rationale: Phenobarbital is a CYP450 enzyme inducer, which increases the metabolic
breakdown of warfarin in the liver. This leads to a decrease in warfarin's blood levels and
therapeutic effectiveness, potentially causing blood clots.
Latest Update 2026/2027 | Rasmussen College |
100% Correct | Grade A
Verified Questions & Answers with Rationales
Section 1: Pharmacokinetics and Pharmacodynamics (10 questions)
1. A patient is prescribed a medication that has a high first-pass effect. The nurse expects that
which of the following will be prescribed?
A) A higher oral dose to achieve the desired therapeutic effect
B) A lower oral dose to prevent toxicity
C) An intramuscular injection to slow absorption
D) A sublingual administration to enhance metabolism
[CORRECT] A) A higher oral dose to achieve the desired therapeutic effect
Rationale: The first-pass effect significantly reduces the concentration of an active drug after it
is absorbed through the gastrointestinal tract and metabolized by the liver before reaching
systemic circulation. Therefore, a higher oral dose is often required to ensure enough of the
active drug reaches the target tissues.
2. A nurse is administering a medication with a half-life of 4 hours. The medication was given at
0800. At what time will the drug reach approximately 25% of its peak initial concentration?
A) 1200
B) 1400
C) 1600
D) 1800
[CORRECT] C) 1600
,Rationale: A half-life is the time required for the plasma concentration of a drug to decrease by
50%. At 1200 (4 hours), it will be at 50%. At 1600 (8 hours, or two half-lives), it will be at 25%
of the initial peak concentration.
3. [MECHANISM OF ACTION] A patient is receiving a competitive antagonist medication.
Which of the following best describes the mechanism of action of this drug?
A) It binds to the receptor and activates it, producing a maximal response.
B) It binds to the receptor site and blocks the action of the endogenous agonist.
C) It binds to a different site on the receptor to enhance the agonist's effect.
D) It destroys the receptor, preventing any future agonist binding.
[CORRECT] B) It binds to the receptor site and blocks the action of the endogenous agonist.
Rationale: A competitive antagonist competes directly with agonists for the same receptor
binding sites. By occupying the receptor without activating it, it prevents the natural agonist from
exerting its physiological effect.
4. A patient with liver cirrhosis is prescribed a highly protein-bound drug (95%). The nurse
assesses the patient for signs of toxicity. Which pharmacokinetic principle explains this risk?
A) Decreased first-pass effect leading to rapid absorption
B) Increased free (unbound) drug circulating in the bloodstream
C) Decreased renal excretion due to altered glomerular filtration
D) Increased lipid solubility causing accumulation in adipose tissue
[CORRECT] B) Increased free (unbound) drug circulating in the bloodstream
Rationale: Liver cirrhosis often leads to hypoalbuminemia (decreased plasma proteins). Highly
protein-bound drugs rely on albumin to stay inactive in the blood; with fewer proteins available,
more of the drug remains free, increasing the risk of pharmacological toxicity.
5. A nurse is reviewing the medication profile of a patient with severe renal impairment. Which
pharmacokinetic process will most likely be affected?
A) Absorption
B) Distribution
, C) Metabolism
D) Excretion
[CORRECT] D) Excretion
Rationale: The kidneys are the primary organs responsible for the excretion of many drugs and
their metabolites. Severe renal impairment directly hinders the body's ability to clear these
substances, leading to drug accumulation and potential toxicity.
6. [MECHANISM OF ACTION] A patient is taking a drug with a very narrow therapeutic index.
What is the primary pharmacodynamic implication of this?
A) The drug has a wide margin of safety between the effective dose and toxic dose.
B) The drug requires extensive hepatic metabolism to become active.
C) Small changes in drug dose or blood levels can easily lead to toxicity or subtherapeutic
effects.
D) The drug binds irreversibly to receptors, requiring high doses for effect.
[CORRECT] C) Small changes in drug dose or blood levels can easily lead to toxicity or
subtherapeutic effects.
Rationale: A narrow therapeutic index means the difference between the minimum effective
concentration and the minimum toxic concentration is very small. This requires precise dosing
and frequent serum drug monitoring to prevent harm.
7. A patient taking warfarin (a CYP450 substrate) is prescribed phenobarbital (a CYP450
inducer). What clinical outcome should the nurse anticipate?
A) Increased risk of bleeding
B) Decreased effectiveness of warfarin
C) Increased risk of phenobarbital toxicity
D) No significant drug interaction
[CORRECT] B) Decreased effectiveness of warfarin
Rationale: Phenobarbital is a CYP450 enzyme inducer, which increases the metabolic
breakdown of warfarin in the liver. This leads to a decrease in warfarin's blood levels and
therapeutic effectiveness, potentially causing blood clots.
