NR546 /NR 546: Midterm Exam
-Psychopharmacology for the Psychiatric-Mental
Health Nurse Practitioner |
-Advanced Psychopharmacology
2026| 2027| 2028 Testing Cycle | Complete Guide
75 Questions With Answers & Expert Rationales
Guaranteed Pass | Graded A+ | Chamberlain
Section 1: Foundational Neurobiology, PK, PD, and Receptor Binding
(Questions 1–10)
1. Which cytochrome P450 enzyme is primarily responsible for the metabolism of
escitalopram?
A) CYP1A2
B) CYP2D6
C) CYP3A4
D) CYP2C19
Answer: D
Rationale: Escitalopram is primarily metabolized by CYP2C19 and CYP3A4, with CYP2C19
being the major pathway.
2. The delayed therapeutic effect of most antidepressants is primarily attributed to the
downregulation of which receptors over time?
A) 5-HT1A autoreceptors
B) D2 receptors
C) H1 receptors
D) Alpha-1 adrenergic receptors
Answer: A
,Rationale: Downregulation of 5-HT1A autoreceptors enhances serotonergic neurotransmission,
correlating with the delayed therapeutic onset of antidepressants.
3. Which pharmacokinetic parameter determines the time required to reach steady-state
concentration of a medication?
A) Volume of distribution
B) Half-life
C) Clearance
D) Bioavailability
Answer: B
Rationale: It takes approximately 4 to 5 half-lives to reach steady-state concentration.
4. A patient is prescribed a medication that is a potent inhibitor of CYP2D6. Which of the
following drugs would require a dose reduction due to increased toxicity risk?
A) Venlafaxine
B) Risperidone
C) Bupropion
D) Duloxetine
Answer: B
Rationale: Risperidone is metabolized by CYP2D6. Inhibition of this enzyme increases
risperidone levels, raising the risk of EPS and other adverse effects.
5. Which receptor blockade is most strongly associated with weight gain and metabolic
syndrome in second-generation antipsychotics?
A) D2
B) 5-HT2A
C) H1 and 5-HT2C
D) M1
Answer: C
Rationale: Blockade of histamine H1 and serotonin 5-HT2C receptors is strongly linked to
increased appetite, weight gain, and metabolic disturbances.
6. The "cheese reaction" associated with MAOIs is due to the inhibition of which enzyme in
the gastrointestinal tract?
A) MAO-A
B) MAO-B
C) CYP3A4
D) COMT
Answer: A
Rationale: MAO-A in the gut normally breaks down dietary tyramine. Its inhibition allows
tyramine to enter systemic circulation, causing a hypertensive crisis.
, 7. Which of the following best describes the mechanism of action of vortioxetine?
A) Selective serotonin reuptake inhibition only
B) Serotonin reuptake inhibition, 5-HT1A agonism, and 5-HT3 antagonism
C) Norepinephrine and dopamine reuptake inhibition
D) NMDA receptor antagonism
Answer: B
Rationale: Vortioxetine is a multimodal antidepressant that inhibits SERT and acts as a 5-HT1A
agonist, 5-HT1B partial agonist, and 5-HT3, 5-HT7, and 5-HT1D antagonist.
8. A patient with a CYP2C19 poor metabolizer phenotype is prescribed citalopram. What is
the maximum recommended daily dose to avoid QT prolongation?
A) 10 mg
B) 20 mg
C) 40 mg
D) 60 mg
Answer: B
Rationale: For CYP2C19 poor metabolizers, the maximum recommended dose of citalopram is
20 mg/day due to the risk of dose-dependent QT prolongation.
9. Which of the following drugs is a prodrug that requires hepatic or enzymatic conversion
to its active form?
A) Sertraline
B) Lisdexamfetamine
C) Paliperidone
D) Lithium
Answer: B
Rationale: Lisdexamfetamine is a prodrug converted to dextroamphetamine in the blood via
hydrolysis by red blood cells.
10. The affinity of a drug for a receptor refers to:
A) The ability of the drug to produce a response after binding
B) The strength of binding between the drug and the receptor
C) The rate at which the drug is eliminated
D) The maximum effect the drug can produce
Answer: B
Rationale: Affinity is the strength of attraction between a drug and its receptor. Efficacy is the
ability to produce a response.
Section 2: Antidepressants (Questions 11–30)
-Psychopharmacology for the Psychiatric-Mental
Health Nurse Practitioner |
-Advanced Psychopharmacology
2026| 2027| 2028 Testing Cycle | Complete Guide
75 Questions With Answers & Expert Rationales
Guaranteed Pass | Graded A+ | Chamberlain
Section 1: Foundational Neurobiology, PK, PD, and Receptor Binding
(Questions 1–10)
1. Which cytochrome P450 enzyme is primarily responsible for the metabolism of
escitalopram?
A) CYP1A2
B) CYP2D6
C) CYP3A4
D) CYP2C19
Answer: D
Rationale: Escitalopram is primarily metabolized by CYP2C19 and CYP3A4, with CYP2C19
being the major pathway.
2. The delayed therapeutic effect of most antidepressants is primarily attributed to the
downregulation of which receptors over time?
A) 5-HT1A autoreceptors
B) D2 receptors
C) H1 receptors
D) Alpha-1 adrenergic receptors
Answer: A
,Rationale: Downregulation of 5-HT1A autoreceptors enhances serotonergic neurotransmission,
correlating with the delayed therapeutic onset of antidepressants.
3. Which pharmacokinetic parameter determines the time required to reach steady-state
concentration of a medication?
A) Volume of distribution
B) Half-life
C) Clearance
D) Bioavailability
Answer: B
Rationale: It takes approximately 4 to 5 half-lives to reach steady-state concentration.
4. A patient is prescribed a medication that is a potent inhibitor of CYP2D6. Which of the
following drugs would require a dose reduction due to increased toxicity risk?
A) Venlafaxine
B) Risperidone
C) Bupropion
D) Duloxetine
Answer: B
Rationale: Risperidone is metabolized by CYP2D6. Inhibition of this enzyme increases
risperidone levels, raising the risk of EPS and other adverse effects.
5. Which receptor blockade is most strongly associated with weight gain and metabolic
syndrome in second-generation antipsychotics?
A) D2
B) 5-HT2A
C) H1 and 5-HT2C
D) M1
Answer: C
Rationale: Blockade of histamine H1 and serotonin 5-HT2C receptors is strongly linked to
increased appetite, weight gain, and metabolic disturbances.
6. The "cheese reaction" associated with MAOIs is due to the inhibition of which enzyme in
the gastrointestinal tract?
A) MAO-A
B) MAO-B
C) CYP3A4
D) COMT
Answer: A
Rationale: MAO-A in the gut normally breaks down dietary tyramine. Its inhibition allows
tyramine to enter systemic circulation, causing a hypertensive crisis.
, 7. Which of the following best describes the mechanism of action of vortioxetine?
A) Selective serotonin reuptake inhibition only
B) Serotonin reuptake inhibition, 5-HT1A agonism, and 5-HT3 antagonism
C) Norepinephrine and dopamine reuptake inhibition
D) NMDA receptor antagonism
Answer: B
Rationale: Vortioxetine is a multimodal antidepressant that inhibits SERT and acts as a 5-HT1A
agonist, 5-HT1B partial agonist, and 5-HT3, 5-HT7, and 5-HT1D antagonist.
8. A patient with a CYP2C19 poor metabolizer phenotype is prescribed citalopram. What is
the maximum recommended daily dose to avoid QT prolongation?
A) 10 mg
B) 20 mg
C) 40 mg
D) 60 mg
Answer: B
Rationale: For CYP2C19 poor metabolizers, the maximum recommended dose of citalopram is
20 mg/day due to the risk of dose-dependent QT prolongation.
9. Which of the following drugs is a prodrug that requires hepatic or enzymatic conversion
to its active form?
A) Sertraline
B) Lisdexamfetamine
C) Paliperidone
D) Lithium
Answer: B
Rationale: Lisdexamfetamine is a prodrug converted to dextroamphetamine in the blood via
hydrolysis by red blood cells.
10. The affinity of a drug for a receptor refers to:
A) The ability of the drug to produce a response after binding
B) The strength of binding between the drug and the receptor
C) The rate at which the drug is eliminated
D) The maximum effect the drug can produce
Answer: B
Rationale: Affinity is the strength of attraction between a drug and its receptor. Efficacy is the
ability to produce a response.
Section 2: Antidepressants (Questions 11–30)
