Psychiatric Nurse Practitioner Assessment 2026 |
Study Guide, Practice Questions, Answers,
Rationales & Exam Review
Chapter 1: Scientific Foundations – Neurobiology & Psychopharmacology
(Questions 1–40)
1. A PMHNP is reviewing the mechanism of action of a newly prescribed
antidepressant. Which of the following best describes the primary mechanism of
selective serotonin reuptake inhibitors (SSRIs)?
A) Blockade of serotonin 5-HT₂A receptors
B) Inhibition of serotonin reuptake via the serotonin transporter (SERT)
C) Direct agonism at 5-HT₁A autoreceptors
D) Irreversible inhibition of monoamine oxidase type A
Correct Answer: B
Rationale: SSRIs work by blocking the serotonin transporter (SERT),
preventing the reuptake of serotonin into the presynaptic neuron and thereby
increasing synaptic serotonin availability. Option A describes atypical
antipsychotics. Option C describes buspirone's partial agonist activity. Option D
describes MAOIs.
2. Which of the following neurotransmitters is primarily implicated in the
pathophysiology of schizophrenia according to the dopamine hypothesis?
A) Serotonin
B) Glutamate
C) Dopamine
D) GABA
Correct Answer: C
Rationale: The dopamine hypothesis posits that positive symptoms of
schizophrenia are related to hyperactivity of dopamine in mesolimbic pathways.
,However, the glutamate hypothesis has gained prominence for negative and
cognitive symptoms. Serotonin and GABA are implicated in mood and anxiety
disorders.
3. A patient on clozapine presents with fever, tachycardia, muscle rigidity, and
altered mental status. Which life-threatening condition should the PMHNP
suspect?
A) Serotonin syndrome
B) Neuroleptic malignant syndrome (NMS)
C) Anticholinergic toxicity
D) Acute dystonia
Correct Answer: B
Rationale: NMS is characterized by the triad of fever, muscle rigidity, and
autonomic instability with altered mental status. It is a medical emergency
requiring immediate discontinuation of the antipsychotic. Serotonin syndrome
presents with hyperreflexia, clonus, and myoclonus rather than rigidity.
4. Which of the following laboratory parameters should be monitored most
closely in a patient initiated on lithium?
A) Liver function tests
B) Thyroid-stimulating hormone, renal function, and serum lithium levels
C) Complete blood count with differential
D) Fasting glucose and lipid panel
Correct Answer: B
Rationale: Lithium has a narrow therapeutic window (0.6–1.2 mEq/L) and
requires monitoring of renal function (creatinine, BUN), thyroid function (TSH, T3,
T4), and serum lithium levels. While CBC and metabolic panels are important for
antipsychotics, they are not the primary monitoring parameters for lithium.
,5. A patient reports that she stopped taking her paroxetine abruptly and now
experiences dizziness, nausea, and "brain zaps." The PMHNP recognizes this as:
A) Serotonin syndrome
B) Antidepressant discontinuation syndrome
C) Hyponatremia
D) Akathisia
Correct Answer: B
Rationale: Paroxetine has a short half-life and no active metabolites,
making discontinuation syndrome common. Symptoms include dizziness, nausea,
flu-like symptoms, and paresthesias ("brain zaps"). Tapering is essential.
Serotonin syndrome requires serotonergic excess, not withdrawal.
6. Which atypical antipsychotic carries the highest risk of agranulocytosis?
A) Risperidone
B) Olanzapine
C) Clozapine
D) Quetiapine
Correct Answer: C
Rationale: Clozapine requires mandatory absolute neutrophil count (ANC)
monitoring due to the risk of severe neutropenia/agranulocytosis. The risk is
approximately 1–2%. Other atypicals do not carry this level of hematologic risk.
7. A patient with bipolar I disorder on valproate reports increased appetite,
weight gain, and hair loss. Which adverse effect is most consistent with
valproate?
A) Weight loss
B) Hair loss and weight gain
C) Hypothyroidism
D) Renal calculi
, Correct Answer: B
Rationale: Valproate is associated with weight gain, hair loss (alopecia),
tremor, and hepatotoxicity. Thyroid abnormalities are more characteristic of
lithium. Renal calculi are not a classic valproate effect.
8. Which of the following statements about the CYP450 system is correct
regarding fluoxetine?
A) It is a potent CYP2D6 inhibitor
B) It is a potent CYP3A4 inducer
C) It has no significant drug interactions
D) It is a CYP1A2 substrate only
Correct Answer: A
Rationale: Fluoxetine is a potent inhibitor of CYP2D6, which metabolizes
many antidepressants, antipsychotics, and opioids (e.g., codeine). This can lead to
elevated levels of co-administered drugs and adverse effects.
9. A patient on haloperidol develops involuntary, repetitive movements of the
tongue and face. This is most consistent with:
A) Acute dystonia
B) Pseudoparkinsonism
C) Tardive dyskinesia
D) Akathisia
Correct Answer: C
Rationale: Tardive dyskinesia involves involuntary, repetitive movements,
often of the tongue, lips, and face, and can be irreversible. It typically emerges
after prolonged antipsychotic use. Acute dystonia occurs early and involves
sustained muscle contractions.
Study Guide, Practice Questions, Answers,
Rationales & Exam Review
Chapter 1: Scientific Foundations – Neurobiology & Psychopharmacology
(Questions 1–40)
1. A PMHNP is reviewing the mechanism of action of a newly prescribed
antidepressant. Which of the following best describes the primary mechanism of
selective serotonin reuptake inhibitors (SSRIs)?
A) Blockade of serotonin 5-HT₂A receptors
B) Inhibition of serotonin reuptake via the serotonin transporter (SERT)
C) Direct agonism at 5-HT₁A autoreceptors
D) Irreversible inhibition of monoamine oxidase type A
Correct Answer: B
Rationale: SSRIs work by blocking the serotonin transporter (SERT),
preventing the reuptake of serotonin into the presynaptic neuron and thereby
increasing synaptic serotonin availability. Option A describes atypical
antipsychotics. Option C describes buspirone's partial agonist activity. Option D
describes MAOIs.
2. Which of the following neurotransmitters is primarily implicated in the
pathophysiology of schizophrenia according to the dopamine hypothesis?
A) Serotonin
B) Glutamate
C) Dopamine
D) GABA
Correct Answer: C
Rationale: The dopamine hypothesis posits that positive symptoms of
schizophrenia are related to hyperactivity of dopamine in mesolimbic pathways.
,However, the glutamate hypothesis has gained prominence for negative and
cognitive symptoms. Serotonin and GABA are implicated in mood and anxiety
disorders.
3. A patient on clozapine presents with fever, tachycardia, muscle rigidity, and
altered mental status. Which life-threatening condition should the PMHNP
suspect?
A) Serotonin syndrome
B) Neuroleptic malignant syndrome (NMS)
C) Anticholinergic toxicity
D) Acute dystonia
Correct Answer: B
Rationale: NMS is characterized by the triad of fever, muscle rigidity, and
autonomic instability with altered mental status. It is a medical emergency
requiring immediate discontinuation of the antipsychotic. Serotonin syndrome
presents with hyperreflexia, clonus, and myoclonus rather than rigidity.
4. Which of the following laboratory parameters should be monitored most
closely in a patient initiated on lithium?
A) Liver function tests
B) Thyroid-stimulating hormone, renal function, and serum lithium levels
C) Complete blood count with differential
D) Fasting glucose and lipid panel
Correct Answer: B
Rationale: Lithium has a narrow therapeutic window (0.6–1.2 mEq/L) and
requires monitoring of renal function (creatinine, BUN), thyroid function (TSH, T3,
T4), and serum lithium levels. While CBC and metabolic panels are important for
antipsychotics, they are not the primary monitoring parameters for lithium.
,5. A patient reports that she stopped taking her paroxetine abruptly and now
experiences dizziness, nausea, and "brain zaps." The PMHNP recognizes this as:
A) Serotonin syndrome
B) Antidepressant discontinuation syndrome
C) Hyponatremia
D) Akathisia
Correct Answer: B
Rationale: Paroxetine has a short half-life and no active metabolites,
making discontinuation syndrome common. Symptoms include dizziness, nausea,
flu-like symptoms, and paresthesias ("brain zaps"). Tapering is essential.
Serotonin syndrome requires serotonergic excess, not withdrawal.
6. Which atypical antipsychotic carries the highest risk of agranulocytosis?
A) Risperidone
B) Olanzapine
C) Clozapine
D) Quetiapine
Correct Answer: C
Rationale: Clozapine requires mandatory absolute neutrophil count (ANC)
monitoring due to the risk of severe neutropenia/agranulocytosis. The risk is
approximately 1–2%. Other atypicals do not carry this level of hematologic risk.
7. A patient with bipolar I disorder on valproate reports increased appetite,
weight gain, and hair loss. Which adverse effect is most consistent with
valproate?
A) Weight loss
B) Hair loss and weight gain
C) Hypothyroidism
D) Renal calculi
, Correct Answer: B
Rationale: Valproate is associated with weight gain, hair loss (alopecia),
tremor, and hepatotoxicity. Thyroid abnormalities are more characteristic of
lithium. Renal calculi are not a classic valproate effect.
8. Which of the following statements about the CYP450 system is correct
regarding fluoxetine?
A) It is a potent CYP2D6 inhibitor
B) It is a potent CYP3A4 inducer
C) It has no significant drug interactions
D) It is a CYP1A2 substrate only
Correct Answer: A
Rationale: Fluoxetine is a potent inhibitor of CYP2D6, which metabolizes
many antidepressants, antipsychotics, and opioids (e.g., codeine). This can lead to
elevated levels of co-administered drugs and adverse effects.
9. A patient on haloperidol develops involuntary, repetitive movements of the
tongue and face. This is most consistent with:
A) Acute dystonia
B) Pseudoparkinsonism
C) Tardive dyskinesia
D) Akathisia
Correct Answer: C
Rationale: Tardive dyskinesia involves involuntary, repetitive movements,
often of the tongue, lips, and face, and can be irreversible. It typically emerges
after prolonged antipsychotic use. Acute dystonia occurs early and involves
sustained muscle contractions.
