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NRNP 6675 Final Psychiatric Mental Health
Nurse Practitioner 2026/2027 with Verified
Answers and Detailed Rationales
Question 1
What is the half-life of lithium?
• A. 12 hours
• B. 24 hours
• C. 36 hours
• D. 48 hours
Correct Answer: B. 24 hours
Rationale:
1. Lithium has an approximate half-life of 24 hours in adults with normal
renal function.
2. The half-life may be prolonged in elderly patients or those with renal
impairment.
3. This 24-hour half-life allows for once or twice daily dosing.
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4. Regular monitoring of lithium levels is essential due to its narrow
therapeutic index.
Question 2
Fluoxetine is the SSRI with the ______ withdrawal risk?
• A. Highest
• B. Moderate
• C. Lowest
• D. Variable
Correct Answer: C. Lowest
Rationale:
1. Fluoxetine has the lowest withdrawal risk among SSRIs due to its long
half-life.
2. The half-life of fluoxetine is approximately 2 weeks (including its active
metabolite norfluoxetine).
3. A longer half-life results in a slower decline in serum levels, reducing
withdrawal symptoms.
4. This makes fluoxetine useful for tapering patients off other SSRIs with
shorter half-lives.
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Question 3
What antipsychotics are good for patients who miss doses of their
medications?
• A. Short-acting antipsychotics only
• B. Antipsychotics with long half-lives
• C. Antipsychotics with immediate release formulations
• D. Only first-generation antipsychotics
Correct Answer: B. Antipsychotics with long half-lives
Rationale:
1. Long half-life antipsychotics maintain therapeutic levels longer,
forgiving missed doses.
2. Examples include Cariprazine (Vraylar) with active metabolites lasting
up to 3 weeks.
3. Aripiprazole (Abilify) has a 3-day half-life.
4. Brexpiprazole (4 days), Pimozide (4-5 days), and Pimavanserin (2 days,
metabolites 8 days) are also options.
Question 4
Disulfiram's alcohol interactions persist for up to how long after the
medication is stopped?
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• A. 24 hours
• B. 3-5 days
• C. Up to 2 weeks
• D. 1 month
Correct Answer: C. Up to 2 weeks
Rationale:
1. Disulfiram has a long half-life of 2-3 days.
2. The disulfiram-alcohol reaction can persist for up to 2 weeks after the
last dose.
3. Patients must be educated to avoid all alcohol-containing products
during this time.
4. This long duration is due to active metabolites that continue to inhibit
aldehyde dehydrogenase.
Question 5
What is the only tricyclic antidepressant (TCA) with a long half-life?
• A. Amitriptyline
• B. Nortriptyline
• C. Protriptyline (Vivactil)
• D. Imipramine
NRNP 6675 Final Psychiatric Mental Health
Nurse Practitioner 2026/2027 with Verified
Answers and Detailed Rationales
Question 1
What is the half-life of lithium?
• A. 12 hours
• B. 24 hours
• C. 36 hours
• D. 48 hours
Correct Answer: B. 24 hours
Rationale:
1. Lithium has an approximate half-life of 24 hours in adults with normal
renal function.
2. The half-life may be prolonged in elderly patients or those with renal
impairment.
3. This 24-hour half-life allows for once or twice daily dosing.
,2|Page
4. Regular monitoring of lithium levels is essential due to its narrow
therapeutic index.
Question 2
Fluoxetine is the SSRI with the ______ withdrawal risk?
• A. Highest
• B. Moderate
• C. Lowest
• D. Variable
Correct Answer: C. Lowest
Rationale:
1. Fluoxetine has the lowest withdrawal risk among SSRIs due to its long
half-life.
2. The half-life of fluoxetine is approximately 2 weeks (including its active
metabolite norfluoxetine).
3. A longer half-life results in a slower decline in serum levels, reducing
withdrawal symptoms.
4. This makes fluoxetine useful for tapering patients off other SSRIs with
shorter half-lives.
,3|Page
Question 3
What antipsychotics are good for patients who miss doses of their
medications?
• A. Short-acting antipsychotics only
• B. Antipsychotics with long half-lives
• C. Antipsychotics with immediate release formulations
• D. Only first-generation antipsychotics
Correct Answer: B. Antipsychotics with long half-lives
Rationale:
1. Long half-life antipsychotics maintain therapeutic levels longer,
forgiving missed doses.
2. Examples include Cariprazine (Vraylar) with active metabolites lasting
up to 3 weeks.
3. Aripiprazole (Abilify) has a 3-day half-life.
4. Brexpiprazole (4 days), Pimozide (4-5 days), and Pimavanserin (2 days,
metabolites 8 days) are also options.
Question 4
Disulfiram's alcohol interactions persist for up to how long after the
medication is stopped?
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• A. 24 hours
• B. 3-5 days
• C. Up to 2 weeks
• D. 1 month
Correct Answer: C. Up to 2 weeks
Rationale:
1. Disulfiram has a long half-life of 2-3 days.
2. The disulfiram-alcohol reaction can persist for up to 2 weeks after the
last dose.
3. Patients must be educated to avoid all alcohol-containing products
during this time.
4. This long duration is due to active metabolites that continue to inhibit
aldehyde dehydrogenase.
Question 5
What is the only tricyclic antidepressant (TCA) with a long half-life?
• A. Amitriptyline
• B. Nortriptyline
• C. Protriptyline (Vivactil)
• D. Imipramine
