APEA PMHNP 3P EXAM PREP – COMPREHENSIVE STUDY GUIDE 2025/2026 Edition | 150 Verified Questions & Answers Psychiatric-Mental Health Nurse Practitioner Certification

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APEA PMHNP 3P EXAM PREP – COMPREHENSIVE STUDY
GUIDE 2025/2026 Edition | 150 Verified Questions & Answers
Psychiatric-Mental Health Nurse Practitioner Certification


Question 1. A 45-year-old patient with major depressive disorder has been on
sertraline 100 mg daily for 8 weeks with partial response. The PMHNP decides to
augment with bupropion XL 150 mg daily. What is the primary rationale for
choosing bupropion?
A. Bupropion increases serotonin reuptake inhibition
B. Bupropion provides complementary norepinephrine and dopamine reuptake
inhibition with a low risk of sexual side effects
C. Bupropion is a potent sedative that improves sleep
D. Bupropion enhances GABA activity
Rationale: Bupropion is an NDRI that complements SSRIs by targeting
norepinephrine and dopamine pathways. It is also associated with low rates of
sexual dysfunction and can help counteract SSRI-induced sexual side effects.


Question 2. A patient on lithium develops coarse tremor, confusion, and ataxia.
Lithium level is 1.9 mEq/L. What is the priority action?
A. Administer the next scheduled dose of lithium
B. Hold lithium and arrange for immediate medical evaluation; consider
hemodialysis if severe
C. Give propranolol for the tremor
D. Reduce the lithium dose by half
Rationale: Lithium level >1.5 mEq/L indicates toxicity. Coarse tremor, confusion,
and ataxia are signs of moderate to severe toxicity. Lithium must be held, and
urgent evaluation including possible hemodialysis is required.


Question 3. Which cytochrome P450 enzyme is most commonly involved in the
metabolism of psychotropic medications?

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A. CYP2C19
B. CYP1A2
C. CYP3A4
D. CYP2D6
Rationale: CYP3A4 metabolizes approximately 50% of all medications, including
many psychotropics. While CYP2D6 (D) is critically important in psychiatry,
CYP3A4 has the broadest substrate range.


Question 4. A patient with generalized anxiety disorder and alcohol use disorder
in remission is seeking treatment. Which medication is most appropriate?
A. Alprazolam
B. Buspirone
C. Diazepam
D. Clonazepam
Rationale: Buspirone is a non-benzodiazepine anxiolytic with no abuse potential,
making it safe for patients with substance use disorders. Benzodiazepines (A, C, D)
carry high abuse risk in this population.


Question 5. A patient on clozapine develops fever, chest pain, and tachycardia
during the first month of treatment. Troponin is elevated. What is the most likely
diagnosis?
A. Agranulocytosis
B. Myocarditis
C. Pulmonary embolism
D. Neuroleptic malignant syndrome
Rationale: Clozapine-induced myocarditis typically occurs in the first 1-2 months
and presents with fever, chest pain, tachycardia, and elevated cardiac enzymes. It
requires immediate discontinuation and cardiology consultation.




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Question 6. Which SSRI has the longest half-life and is least likely to cause
discontinuation syndrome?
A. Paroxetine
B. Sertraline
C. Fluoxetine
D. Escitalopram
Rationale: Fluoxetine has a half-life of 4-6 days and its active metabolite
norfluoxetine 4-16 days, providing a self-taper. Paroxetine (A) has the shortest
half-life and highest risk of discontinuation symptoms.


Question 7. A patient taking phenelzine (MAOI) asks about dietary restrictions.
Which food must be strictly avoided?
A. Fresh chicken
B. Aged cheddar cheese
C. White rice
D. Fresh apples
Rationale: Aged cheeses are high in tyramine, which can cause a hypertensive
crisis when combined with MAOIs. Fresh meats, fruits, and grains are safe.


Question 8. What is the required washout period when switching from fluoxetine
to an MAOI?
A. 1 week
B. 2 weeks
C. At least 5 weeks
D. No washout needed
Rationale: Fluoxetine's long half-life requires a minimum 5-week washout before
starting an MAOI to prevent serotonin syndrome. Other SSRIs require
approximately 2 weeks.




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Question 9. A patient with bipolar I disorder is on valproic acid. Which laboratory
tests must be monitored regularly?
A. Renal function and TSH
B. Liver function tests and complete blood count
C. Serum glucose and lipids
D. Serum calcium and phosphate
Rationale: Valproic acid carries risks of hepatotoxicity and thrombocytopenia.
LFTs and CBC with platelets must be monitored at baseline and regularly. Renal
function and TSH (A) are for lithium.


Question 10. A patient with schizophrenia on risperidone develops breast
tenderness and galactorrhea. What is the underlying mechanism?
A. Anticholinergic effects
B. Hyperprolactinemia from D2 receptor blockade in the anterior pituitary
C. Serotonin syndrome
D. Orthostatic hypotension
Rationale: Risperidone is a potent D2 antagonist. Blocking dopamine in the
tuberoinfundibular pathway disinhibits prolactin secretion, causing
hyperprolactinemia. Symptoms include galactorrhea, gynecomastia, and
amenorrhea.


Question 11. A patient on carbamazepine for bipolar disorder develops fever,
rash, and lymphadenopathy. What is the most likely diagnosis?
A. Common cold
B. DRESS syndrome (Drug Reaction with Eosinophilia and Systemic Symptoms)
C. Lithium toxicity
D. Serotonin syndrome
Rationale: Carbamazepine can cause severe hypersensitivity reactions including
DRESS and SJS/TEN, particularly in those with HLA-B*1502 allele. Immediate
discontinuation is required.


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