NSG 552 PSYCHOPHARMACOLOGY EXAM 300 ACTUAL
QUESTIONS AND CORRET ANSWERS WITH RATIONALE
LATEST 2026 ALREADY GRADED A+
This comprehensive collection of 300 multiple-choice questions provides an
exhaustive review of NSG 552 Psychopharmacology, covering
neurotransmitter systems, receptor mechanisms, pharmacokinetics,
pharmacodynamics, medication classes, adverse effects, drug interactions, and
clinical applications. Each question presents a unique clinical scenario
encompassing antidepressants, antipsychotics, mood stabilizers, anxiolytics,
stimulants, and emerging treatments. Every item includes a correct answer
with an in-depth rationale explaining the underlying pharmacology, clinical
reasoning, and evidence-based prescribing principles. The questions progress
from foundational concepts to complex clinical decision-making, ensuring
thorough preparation for psychopharmacology examinations and advanced
practice nursing.
1. A PMHNP student is studying the basic principles of neurotransmission. Which
neurotransmitter is the primary excitatory neurotransmitter in the central nervous
system?
A. GABA
B. Glutamate
C. Dopamine
D. Serotonin
Correct Answer: B
Rationale: Glutamate is the major excitatory neurotransmitter involved in learning,
memory, and synaptic plasticity. GABA is the primary inhibitory neurotransmitter.
Dopamine and serotonin are neuromodulators with more specific roles in reward,
mood, and other functions.
2. A patient is a known CYP2D6 poor metabolizer. Which antidepressant requires
the most caution due to its reliance on CYP2D6 for metabolism?
A. Sertraline
B. Paroxetine
C. Bupropion
D. Venlafaxine
Correct Answer: B
,Rationale: Paroxetine is both a substrate and a potent inhibitor of CYP2D6. In poor
metabolizers, paroxetine levels can become significantly elevated, increasing the
risk of side effects. Paroxetine also inhibits its own metabolism, compounding the
issue.
3. Which cytochrome P450 enzyme is responsible for metabolizing approximately
50% of all medications, including many psychotropics such as alprazolam and
midazolam?
A. CYP2D6
B. CYP3A4
C. CYP1A2
D. CYP2C19
Correct Answer: B
Rationale: CYP3A4 is responsible for metabolizing approximately 50% of all
medications, including many psychotropics such as alprazolam, midazolam, and
certain antidepressants. CYP2D6 metabolizes SSRIs and antipsychotics, CYP1A2
metabolizes caffeine and clozapine, and CYP2C19 metabolizes citalopram,
escitalopram, and diazepam.
4. The therapeutic action of most antidepressants is related to:
A. Immediate increase in synaptic neurotransmitters
B. Downstream effects including receptor adaptation, neurogenesis, and BDNF
C. Blockade of voltage-gated sodium channels
D. Direct GABA receptor agonism
Correct Answer: B
Rationale: While antidepressants do increase synaptic neurotransmitter levels, their
therapeutic effects are primarily related to downstream effects including receptor
adaptation, neurogenesis, and increased brain-derived neurotrophic factor (BDNF).
These changes typically take 2-6 weeks, which corresponds to the clinical onset of
antidepressant action.
5. Which neurotransmitter is primarily associated with the "fight or flight"
response?
A. Acetylcholine
B. Norepinephrine
C. Dopamine
D. Serotonin
Correct Answer: B
,Rationale: Norepinephrine is the primary neurotransmitter associated with the
sympathetic "fight or flight" response. It is released by sympathetic neurons and
the adrenal medulla, increasing heart rate, blood pressure, and alertness.
6. What is the mechanism of action of benzodiazepines?
A. Direct GABA receptor agonism
B. Positive allosteric modulation of GABA-A receptors
C. Blockade of NMDA receptors
D. Inhibition of monoamine oxidase
Correct Answer: B
Rationale: Benzodiazepines are positive allosteric modulators of GABA-A
receptors. They enhance the effect of GABA by increasing the frequency of
chloride channel opening. They do not directly activate GABA receptors, block
NMDA receptors, or inhibit MAO.
7. Which of the following best describes the mechanism of action of the
antipsychotic clozapine?
A. D2 receptor antagonist with strong 5-HT2A antagonism
B. Dopamine partial agonist
C. Serotonin reuptake inhibitor
D. NMDA receptor antagonist
Correct Answer: A
Rationale: Clozapine is an atypical antipsychotic with strong D2 receptor
antagonism and potent 5-HT2A antagonism. Its unique receptor profile, including
actions at D1, D4, and alpha-adrenergic receptors, contributes to its efficacy in
treatment-resistant schizophrenia.
8. The D2 receptor blockade in which dopamine pathway causes extrapyramidal
symptoms including Parkinsonian symptoms?
A. Mesolimbic pathway
B. Nigrostriatal pathway
C. Mesocortical pathway
D. Tuberoinfundibular pathway
Correct Answer: B
Rationale: D2 receptor blockade in the nigrostriatal pathway causes extrapyramidal
symptoms including Parkinsonian symptoms, dystonia, and akathisia. 5-HT2A
blockade is associated with reduced EPS. Alpha-1 blockade causes orthostatic
hypotension. H1 blockade causes sedation and weight gain.
9. Which neurotransmitter is the primary inhibitory neurotransmitter in the CNS?
, A. Glutamate
B. GABA
C. Glycine
D. Acetylcholine
Correct Answer: B
Rationale: GABA (gamma-aminobutyric acid) is the primary inhibitory
neurotransmitter in the central nervous system, reducing neuronal excitability.
Glutamate is excitatory. Glycine is inhibitory in the spinal cord. Acetylcholine is
excitatory at neuromuscular junctions and involved in cognition.
10. What is the mechanism of action of SSRIs?
A. Blockade of dopamine reuptake
B. Blockade of serotonin reuptake
C. Blockade of norepinephrine reuptake
D. Agonism of GABA receptors
Correct Answer: B
Rationale: SSRIs (Selective Serotonin Reuptake Inhibitors) work by blocking the
reuptake of serotonin, increasing its availability in the synaptic cleft. They are
selective for serotonin transporters and have minimal effect on dopamine or
norepinephrine reuptake. They are not GABA agonists.
11. Which of the following medications is a serotonin-norepinephrine reuptake
inhibitor (SNRI)?
A. Fluoxetine
B. Duloxetine
C. Bupropion
D. Citalopram
Correct Answer: B
Rationale: Duloxetine is an SNRI that inhibits reuptake of both serotonin and
norepinephrine. Fluoxetine and citalopram are SSRIs. Bupropion is a dopamine-
norepinephrine reuptake inhibitor (DNRI).
12. What is the role of autoreceptors in neurotransmission?
A. They increase neurotransmitter release
B. They regulate neurotransmitter release through negative feedback
C. They are postsynaptic receptors
D. They are located on the postsynaptic membrane
Correct Answer: B
Rationale: Autoreceptors are presynaptic receptors that regulate neurotransmitter
release through negative feedback. When activated, they inhibit further release of
QUESTIONS AND CORRET ANSWERS WITH RATIONALE
LATEST 2026 ALREADY GRADED A+
This comprehensive collection of 300 multiple-choice questions provides an
exhaustive review of NSG 552 Psychopharmacology, covering
neurotransmitter systems, receptor mechanisms, pharmacokinetics,
pharmacodynamics, medication classes, adverse effects, drug interactions, and
clinical applications. Each question presents a unique clinical scenario
encompassing antidepressants, antipsychotics, mood stabilizers, anxiolytics,
stimulants, and emerging treatments. Every item includes a correct answer
with an in-depth rationale explaining the underlying pharmacology, clinical
reasoning, and evidence-based prescribing principles. The questions progress
from foundational concepts to complex clinical decision-making, ensuring
thorough preparation for psychopharmacology examinations and advanced
practice nursing.
1. A PMHNP student is studying the basic principles of neurotransmission. Which
neurotransmitter is the primary excitatory neurotransmitter in the central nervous
system?
A. GABA
B. Glutamate
C. Dopamine
D. Serotonin
Correct Answer: B
Rationale: Glutamate is the major excitatory neurotransmitter involved in learning,
memory, and synaptic plasticity. GABA is the primary inhibitory neurotransmitter.
Dopamine and serotonin are neuromodulators with more specific roles in reward,
mood, and other functions.
2. A patient is a known CYP2D6 poor metabolizer. Which antidepressant requires
the most caution due to its reliance on CYP2D6 for metabolism?
A. Sertraline
B. Paroxetine
C. Bupropion
D. Venlafaxine
Correct Answer: B
,Rationale: Paroxetine is both a substrate and a potent inhibitor of CYP2D6. In poor
metabolizers, paroxetine levels can become significantly elevated, increasing the
risk of side effects. Paroxetine also inhibits its own metabolism, compounding the
issue.
3. Which cytochrome P450 enzyme is responsible for metabolizing approximately
50% of all medications, including many psychotropics such as alprazolam and
midazolam?
A. CYP2D6
B. CYP3A4
C. CYP1A2
D. CYP2C19
Correct Answer: B
Rationale: CYP3A4 is responsible for metabolizing approximately 50% of all
medications, including many psychotropics such as alprazolam, midazolam, and
certain antidepressants. CYP2D6 metabolizes SSRIs and antipsychotics, CYP1A2
metabolizes caffeine and clozapine, and CYP2C19 metabolizes citalopram,
escitalopram, and diazepam.
4. The therapeutic action of most antidepressants is related to:
A. Immediate increase in synaptic neurotransmitters
B. Downstream effects including receptor adaptation, neurogenesis, and BDNF
C. Blockade of voltage-gated sodium channels
D. Direct GABA receptor agonism
Correct Answer: B
Rationale: While antidepressants do increase synaptic neurotransmitter levels, their
therapeutic effects are primarily related to downstream effects including receptor
adaptation, neurogenesis, and increased brain-derived neurotrophic factor (BDNF).
These changes typically take 2-6 weeks, which corresponds to the clinical onset of
antidepressant action.
5. Which neurotransmitter is primarily associated with the "fight or flight"
response?
A. Acetylcholine
B. Norepinephrine
C. Dopamine
D. Serotonin
Correct Answer: B
,Rationale: Norepinephrine is the primary neurotransmitter associated with the
sympathetic "fight or flight" response. It is released by sympathetic neurons and
the adrenal medulla, increasing heart rate, blood pressure, and alertness.
6. What is the mechanism of action of benzodiazepines?
A. Direct GABA receptor agonism
B. Positive allosteric modulation of GABA-A receptors
C. Blockade of NMDA receptors
D. Inhibition of monoamine oxidase
Correct Answer: B
Rationale: Benzodiazepines are positive allosteric modulators of GABA-A
receptors. They enhance the effect of GABA by increasing the frequency of
chloride channel opening. They do not directly activate GABA receptors, block
NMDA receptors, or inhibit MAO.
7. Which of the following best describes the mechanism of action of the
antipsychotic clozapine?
A. D2 receptor antagonist with strong 5-HT2A antagonism
B. Dopamine partial agonist
C. Serotonin reuptake inhibitor
D. NMDA receptor antagonist
Correct Answer: A
Rationale: Clozapine is an atypical antipsychotic with strong D2 receptor
antagonism and potent 5-HT2A antagonism. Its unique receptor profile, including
actions at D1, D4, and alpha-adrenergic receptors, contributes to its efficacy in
treatment-resistant schizophrenia.
8. The D2 receptor blockade in which dopamine pathway causes extrapyramidal
symptoms including Parkinsonian symptoms?
A. Mesolimbic pathway
B. Nigrostriatal pathway
C. Mesocortical pathway
D. Tuberoinfundibular pathway
Correct Answer: B
Rationale: D2 receptor blockade in the nigrostriatal pathway causes extrapyramidal
symptoms including Parkinsonian symptoms, dystonia, and akathisia. 5-HT2A
blockade is associated with reduced EPS. Alpha-1 blockade causes orthostatic
hypotension. H1 blockade causes sedation and weight gain.
9. Which neurotransmitter is the primary inhibitory neurotransmitter in the CNS?
, A. Glutamate
B. GABA
C. Glycine
D. Acetylcholine
Correct Answer: B
Rationale: GABA (gamma-aminobutyric acid) is the primary inhibitory
neurotransmitter in the central nervous system, reducing neuronal excitability.
Glutamate is excitatory. Glycine is inhibitory in the spinal cord. Acetylcholine is
excitatory at neuromuscular junctions and involved in cognition.
10. What is the mechanism of action of SSRIs?
A. Blockade of dopamine reuptake
B. Blockade of serotonin reuptake
C. Blockade of norepinephrine reuptake
D. Agonism of GABA receptors
Correct Answer: B
Rationale: SSRIs (Selective Serotonin Reuptake Inhibitors) work by blocking the
reuptake of serotonin, increasing its availability in the synaptic cleft. They are
selective for serotonin transporters and have minimal effect on dopamine or
norepinephrine reuptake. They are not GABA agonists.
11. Which of the following medications is a serotonin-norepinephrine reuptake
inhibitor (SNRI)?
A. Fluoxetine
B. Duloxetine
C. Bupropion
D. Citalopram
Correct Answer: B
Rationale: Duloxetine is an SNRI that inhibits reuptake of both serotonin and
norepinephrine. Fluoxetine and citalopram are SSRIs. Bupropion is a dopamine-
norepinephrine reuptake inhibitor (DNRI).
12. What is the role of autoreceptors in neurotransmission?
A. They increase neurotransmitter release
B. They regulate neurotransmitter release through negative feedback
C. They are postsynaptic receptors
D. They are located on the postsynaptic membrane
Correct Answer: B
Rationale: Autoreceptors are presynaptic receptors that regulate neurotransmitter
release through negative feedback. When activated, they inhibit further release of
