Academic Year 2026–2027 NSG 552
Psychopharmacology Exam | 190+ Practice Questions
& Verified Answers | Latest Study Guide, Test Bank,
Practice Exam, Comprehensive Review & Exam Prep |
NSG 552 Psychopharmacology, Psychiatric
Medications, Antidepressants, Antipsychotics, Mood
Stabilizers, Anxiolytics, Stimulants, Pharmacokinetics,
Pharmacodynamics, Adverse Effects, Drug Interactions
& Clinical Medication Management
Question 1: Which of the following pharmacological principles best explains
the delayed onset of therapeutic effects for most antidepressant medications?
A. Rapid downregulation of postsynaptic receptors
B. Immediate increase in monoamine neurotransmitter synthesis
C. Neuroadaptive changes in intracellular signaling cascades and gene expression
D. Direct antagonism of presynaptic autoreceptors within hours of administration
CORRECT ANSWER: C. Neuroadaptive changes in intracellular signaling
cascades and gene expression
Rationale: While antidepressants like SSRIs increase synaptic monoamine levels within
hours, the therapeutic effect typically takes 2-6 weeks. This delay is attributed to
downstream neuroadaptive processes, including alterations in G-protein coupling,
second messenger systems (e.g., cAMP), and gene expression that modulate neuronal
plasticity and connectivity, rather than the acute neurotransmitter increase itself.
Question 2: A patient with treatment-resistant depression is started on a
monoamine oxidase inhibitor (MAOI). Which dietary instruction is most
critical to prevent a hypertensive crisis?
A. Limit intake of high-fiber foods
B. Avoid foods rich in tyramine, such as aged cheeses and cured meats
C. Increase consumption of foods high in tryptophan
D. Restrict fluids to 1.5 liters per day
CORRECT ANSWER: B. Avoid foods rich in tyramine, such as aged cheeses and
cured meats
Rationale: MAOIs inhibit the breakdown of tyramine, an indirectly acting
sympathomimetic amine. Ingestion of tyramine-rich foods can lead to a rapid release of
norepinephrine, resulting in a severe hypertensive crisis, which is a potentially fatal
adverse effect.
Question 3: The mechanism of action of lamotrigine in the treatment of
bipolar disorder primarily involves:
,A. Blockade of dopamine D2 receptors
B. Inhibition of voltage-gated sodium channels and glutamate release
C. Enhancement of GABA-A receptor activity
D. Antagonism of serotonin 5-HT2A receptors
CORRECT ANSWER: B. Inhibition of voltage-gated sodium channels and
glutamate release
Rationale: Lamotrigine exerts its mood-stabilizing effects by inhibiting voltage-sensitive
sodium channels, which stabilizes neuronal membranes and reduces the release of
excitatory neurotransmitters, particularly glutamate. This mechanism is distinct from the
dopaminergic or serotonergic actions of other psychotropics.
Question 4: Which cytochrome P450 enzyme is primarily responsible for the
metabolism of most selective serotonin reuptake inhibitors (SSRIs), and is
notably inhibited by fluoxetine and paroxetine?
A. CYP1A2
B. CYP2D6
C. CYP3A4
D. CYP2C19
CORRECT ANSWER: B. CYP2D6
Rationale: CYP2D6 is a major isoenzyme involved in the metabolism of many SSRIs,
including fluoxetine, paroxetine, and fluvoxamine. Fluoxetine and paroxetine are potent
inhibitors of CYP2D6, leading to significant drug-drug interactions when co-
administered with other substrates of this enzyme, such as certain antipsychotics and
beta-blockers.
Question 5: A patient on clozapine therapy develops a fever, tachycardia, and
stupor. Laboratory results reveal a creatinine kinase level of 10,000 U/L. What
is the most likely diagnosis and recommended immediate action?
A. Serotonin syndrome; administer cyproheptadine
B. Neuroleptic malignant syndrome; discontinue clozapine and supportive care
C. Agranulocytosis; discontinue clozapine and start antibiotics
D. Tardive dyskinesia; add valbenazine
CORRECT ANSWER: B. Neuroleptic malignant syndrome; discontinue
clozapine and supportive care
Rationale: The triad of fever, autonomic instability (tachycardia), and elevated creatinine
kinase (CK) is classic for Neuroleptic Malignant Syndrome (NMS), a life-threatening
idiosyncratic reaction to antipsychotics. Immediate management requires
discontinuation of the offending agent (clozapine), supportive care, and potentially
dantrolene or bromocriptine. Agranulocytosis is an infection risk without elevated CK.
Question 6: The therapeutic effect of buspirone for generalized anxiety
disorder is most closely associated with which receptor activity?
,A. Full agonism at GABA-A receptors
B. Antagonism at histamine H1 receptors
C. Partial agonism at serotonin 5-HT1A receptors
D. Antagonism at dopamine D2 receptors
CORRECT ANSWER: C. Partial agonism at serotonin 5-HT1A receptors
Rationale: Buspirone is a partial agonist at presynaptic and postsynaptic 5-HT1A
receptors. This action reduces serotonergic neurotransmission in the raphe nuclei, which
is thought to alleviate anxiety. Its lack of interaction with GABA or H1 receptors explains
its non-sedating profile and absence of dependence potential.
Question 7: Which of the following statements correctly differentiates the
mechanism of action of benzodiazepines from barbiturates?
A. Both bind to the same site on the GABA-A receptor
B. Barbiturates increase the frequency of channel opening, while benzodiazepines
increase the duration
C. Benzodiazepines require GABA for their modulatory effect, whereas barbiturates can
enhance GABA activity even in its absence
D. Barbiturates are selective for α1-containing GABA-A receptors, while
benzodiazepines are not
CORRECT ANSWER: C. Benzodiazepines require GABA for their modulatory
effect, whereas barbiturates can enhance GABA activity even in its absence
Rationale: Benzodiazepines are positive allosteric modulators that increase
the frequency of channel opening only in the presence of GABA. In contrast, barbiturates
can increase the duration of channel opening and can directly activate the channel at
high doses, independent of GABA. This difference underlies the wider safety margin of
benzodiazepines.
Question 8: A patient with bipolar I disorder is stabilized on lithium carbonate.
Their serum lithium level is reported as 1.8 mEq/L. Which of the following
clinical presentations is most consistent with this level?
A. Coarse tremor, confusion, and hyperreflexia
B. Polydipsia and polyuria
C. Fine tremor and mild nausea
D. Leukocytosis and weight gain
CORRECT ANSWER: A. Coarse tremor, confusion, and hyperreflexia
Rationale: The therapeutic range for lithium is 0.6-1.2 mEq/L. A level of 1.8 mEq/L falls
into the toxic range, characterized by neurological symptoms such as coarse tremor,
confusion, ataxia, and hyperreflexia. Gastrointestinal distress and fine tremor are
common at therapeutic levels, while polydipsia is a common adverse effect but not the
most critical at this toxic level.
, Question 9: The primary mechanism by which valproic acid (divalproex)
exerts its mood-stabilizing effects is believed to involve:
A. Antagonism of NMDA receptors
B. Blockade of voltage-gated calcium channels
C. Inhibition of histone deacetylase (HDAC) and increased GABA synthesis
D. Selective antagonism of dopamine D4 receptors
CORRECT ANSWER: C. Inhibition of histone deacetylase (HDAC) and increased
GABA synthesis
Rationale: Valproate's mood-stabilizing actions are multifaceted but significantly involve
HDAC inhibition, leading to changes in gene expression, and an increase in GABA
synthesis and availability in the brain. While it does have effects on sodium channels,
HDAC inhibition is considered a key mechanism for its chronic neuroplastic effects.
Question 10: A patient is prescribed aripiprazole as an adjunct to an SSRI for
major depressive disorder. Aripiprazole’s unique mechanism of action as a
"dopamine system stabilizer" is characterized by:
A. Full antagonism at D2 receptors and antagonism at 5-HT2A receptors
B. Partial agonism at D2 receptors and antagonism at 5-HT2A receptors
C. Full agonism at D1 receptors and partial agonism at 5-HT1A receptors
D. Antagonism at D2 receptors and inhibition of serotonin reuptake
CORRECT ANSWER: B. Partial agonism at D2 receptors and antagonism at 5-
HT2A receptors
Rationale: Aripiprazole acts as a partial agonist at dopamine D2 receptors, which
stabilizes dopaminergic activity (reducing activity when it's high and increasing it when
it's low). It also functions as a 5-HT2A antagonist and a partial agonist at 5-HT1A
receptors, contributing to its efficacy and tolerability profile.
Question 11: Which of the following adverse effects is most specifically
associated with the use of tricyclic antidepressants (TCAs) due to their off-
target receptor binding?
A. Agranulocytosis
B. Orthostatic hypotension due to α1-adrenergic blockade
C. Hyponatremia due to SIADH
D. Prolonged QTc interval due to hERG channel blockade
CORRECT ANSWER: B. Orthostatic hypotension due to α1-adrenergic blockade
Rationale: TCAs have a high affinity for α1-adrenergic receptors. Antagonism of these
peripheral receptors leads to vasodilation and orthostatic hypotension, a common and
significant side effect. While TCAs can cause QTc prolongation, the α1-blockade is a
classic, defining side effect of this class. Agranulocytosis is more specific to clozapine.
Psychopharmacology Exam | 190+ Practice Questions
& Verified Answers | Latest Study Guide, Test Bank,
Practice Exam, Comprehensive Review & Exam Prep |
NSG 552 Psychopharmacology, Psychiatric
Medications, Antidepressants, Antipsychotics, Mood
Stabilizers, Anxiolytics, Stimulants, Pharmacokinetics,
Pharmacodynamics, Adverse Effects, Drug Interactions
& Clinical Medication Management
Question 1: Which of the following pharmacological principles best explains
the delayed onset of therapeutic effects for most antidepressant medications?
A. Rapid downregulation of postsynaptic receptors
B. Immediate increase in monoamine neurotransmitter synthesis
C. Neuroadaptive changes in intracellular signaling cascades and gene expression
D. Direct antagonism of presynaptic autoreceptors within hours of administration
CORRECT ANSWER: C. Neuroadaptive changes in intracellular signaling
cascades and gene expression
Rationale: While antidepressants like SSRIs increase synaptic monoamine levels within
hours, the therapeutic effect typically takes 2-6 weeks. This delay is attributed to
downstream neuroadaptive processes, including alterations in G-protein coupling,
second messenger systems (e.g., cAMP), and gene expression that modulate neuronal
plasticity and connectivity, rather than the acute neurotransmitter increase itself.
Question 2: A patient with treatment-resistant depression is started on a
monoamine oxidase inhibitor (MAOI). Which dietary instruction is most
critical to prevent a hypertensive crisis?
A. Limit intake of high-fiber foods
B. Avoid foods rich in tyramine, such as aged cheeses and cured meats
C. Increase consumption of foods high in tryptophan
D. Restrict fluids to 1.5 liters per day
CORRECT ANSWER: B. Avoid foods rich in tyramine, such as aged cheeses and
cured meats
Rationale: MAOIs inhibit the breakdown of tyramine, an indirectly acting
sympathomimetic amine. Ingestion of tyramine-rich foods can lead to a rapid release of
norepinephrine, resulting in a severe hypertensive crisis, which is a potentially fatal
adverse effect.
Question 3: The mechanism of action of lamotrigine in the treatment of
bipolar disorder primarily involves:
,A. Blockade of dopamine D2 receptors
B. Inhibition of voltage-gated sodium channels and glutamate release
C. Enhancement of GABA-A receptor activity
D. Antagonism of serotonin 5-HT2A receptors
CORRECT ANSWER: B. Inhibition of voltage-gated sodium channels and
glutamate release
Rationale: Lamotrigine exerts its mood-stabilizing effects by inhibiting voltage-sensitive
sodium channels, which stabilizes neuronal membranes and reduces the release of
excitatory neurotransmitters, particularly glutamate. This mechanism is distinct from the
dopaminergic or serotonergic actions of other psychotropics.
Question 4: Which cytochrome P450 enzyme is primarily responsible for the
metabolism of most selective serotonin reuptake inhibitors (SSRIs), and is
notably inhibited by fluoxetine and paroxetine?
A. CYP1A2
B. CYP2D6
C. CYP3A4
D. CYP2C19
CORRECT ANSWER: B. CYP2D6
Rationale: CYP2D6 is a major isoenzyme involved in the metabolism of many SSRIs,
including fluoxetine, paroxetine, and fluvoxamine. Fluoxetine and paroxetine are potent
inhibitors of CYP2D6, leading to significant drug-drug interactions when co-
administered with other substrates of this enzyme, such as certain antipsychotics and
beta-blockers.
Question 5: A patient on clozapine therapy develops a fever, tachycardia, and
stupor. Laboratory results reveal a creatinine kinase level of 10,000 U/L. What
is the most likely diagnosis and recommended immediate action?
A. Serotonin syndrome; administer cyproheptadine
B. Neuroleptic malignant syndrome; discontinue clozapine and supportive care
C. Agranulocytosis; discontinue clozapine and start antibiotics
D. Tardive dyskinesia; add valbenazine
CORRECT ANSWER: B. Neuroleptic malignant syndrome; discontinue
clozapine and supportive care
Rationale: The triad of fever, autonomic instability (tachycardia), and elevated creatinine
kinase (CK) is classic for Neuroleptic Malignant Syndrome (NMS), a life-threatening
idiosyncratic reaction to antipsychotics. Immediate management requires
discontinuation of the offending agent (clozapine), supportive care, and potentially
dantrolene or bromocriptine. Agranulocytosis is an infection risk without elevated CK.
Question 6: The therapeutic effect of buspirone for generalized anxiety
disorder is most closely associated with which receptor activity?
,A. Full agonism at GABA-A receptors
B. Antagonism at histamine H1 receptors
C. Partial agonism at serotonin 5-HT1A receptors
D. Antagonism at dopamine D2 receptors
CORRECT ANSWER: C. Partial agonism at serotonin 5-HT1A receptors
Rationale: Buspirone is a partial agonist at presynaptic and postsynaptic 5-HT1A
receptors. This action reduces serotonergic neurotransmission in the raphe nuclei, which
is thought to alleviate anxiety. Its lack of interaction with GABA or H1 receptors explains
its non-sedating profile and absence of dependence potential.
Question 7: Which of the following statements correctly differentiates the
mechanism of action of benzodiazepines from barbiturates?
A. Both bind to the same site on the GABA-A receptor
B. Barbiturates increase the frequency of channel opening, while benzodiazepines
increase the duration
C. Benzodiazepines require GABA for their modulatory effect, whereas barbiturates can
enhance GABA activity even in its absence
D. Barbiturates are selective for α1-containing GABA-A receptors, while
benzodiazepines are not
CORRECT ANSWER: C. Benzodiazepines require GABA for their modulatory
effect, whereas barbiturates can enhance GABA activity even in its absence
Rationale: Benzodiazepines are positive allosteric modulators that increase
the frequency of channel opening only in the presence of GABA. In contrast, barbiturates
can increase the duration of channel opening and can directly activate the channel at
high doses, independent of GABA. This difference underlies the wider safety margin of
benzodiazepines.
Question 8: A patient with bipolar I disorder is stabilized on lithium carbonate.
Their serum lithium level is reported as 1.8 mEq/L. Which of the following
clinical presentations is most consistent with this level?
A. Coarse tremor, confusion, and hyperreflexia
B. Polydipsia and polyuria
C. Fine tremor and mild nausea
D. Leukocytosis and weight gain
CORRECT ANSWER: A. Coarse tremor, confusion, and hyperreflexia
Rationale: The therapeutic range for lithium is 0.6-1.2 mEq/L. A level of 1.8 mEq/L falls
into the toxic range, characterized by neurological symptoms such as coarse tremor,
confusion, ataxia, and hyperreflexia. Gastrointestinal distress and fine tremor are
common at therapeutic levels, while polydipsia is a common adverse effect but not the
most critical at this toxic level.
, Question 9: The primary mechanism by which valproic acid (divalproex)
exerts its mood-stabilizing effects is believed to involve:
A. Antagonism of NMDA receptors
B. Blockade of voltage-gated calcium channels
C. Inhibition of histone deacetylase (HDAC) and increased GABA synthesis
D. Selective antagonism of dopamine D4 receptors
CORRECT ANSWER: C. Inhibition of histone deacetylase (HDAC) and increased
GABA synthesis
Rationale: Valproate's mood-stabilizing actions are multifaceted but significantly involve
HDAC inhibition, leading to changes in gene expression, and an increase in GABA
synthesis and availability in the brain. While it does have effects on sodium channels,
HDAC inhibition is considered a key mechanism for its chronic neuroplastic effects.
Question 10: A patient is prescribed aripiprazole as an adjunct to an SSRI for
major depressive disorder. Aripiprazole’s unique mechanism of action as a
"dopamine system stabilizer" is characterized by:
A. Full antagonism at D2 receptors and antagonism at 5-HT2A receptors
B. Partial agonism at D2 receptors and antagonism at 5-HT2A receptors
C. Full agonism at D1 receptors and partial agonism at 5-HT1A receptors
D. Antagonism at D2 receptors and inhibition of serotonin reuptake
CORRECT ANSWER: B. Partial agonism at D2 receptors and antagonism at 5-
HT2A receptors
Rationale: Aripiprazole acts as a partial agonist at dopamine D2 receptors, which
stabilizes dopaminergic activity (reducing activity when it's high and increasing it when
it's low). It also functions as a 5-HT2A antagonist and a partial agonist at 5-HT1A
receptors, contributing to its efficacy and tolerability profile.
Question 11: Which of the following adverse effects is most specifically
associated with the use of tricyclic antidepressants (TCAs) due to their off-
target receptor binding?
A. Agranulocytosis
B. Orthostatic hypotension due to α1-adrenergic blockade
C. Hyponatremia due to SIADH
D. Prolonged QTc interval due to hERG channel blockade
CORRECT ANSWER: B. Orthostatic hypotension due to α1-adrenergic blockade
Rationale: TCAs have a high affinity for α1-adrenergic receptors. Antagonism of these
peripheral receptors leads to vasodilation and orthostatic hypotension, a common and
significant side effect. While TCAs can cause QTc prolongation, the α1-blockade is a
classic, defining side effect of this class. Agranulocytosis is more specific to clozapine.
