NRNP 6675 WALDEN
FINAL EXAM
Actual Questions and Answers
Expert-Verified Explanation
This Exam contains:
❖ Guarantee passing score
❖ 100 Questions and Answers
❖ format set of multiple-choice
❖ Expert-Verified Explanation
❖ Verified with trusted textbooks
,1) The half-life of lithium is about…?
A. 8 hours
B. 12 hours
C. 24 hours
D. 48 hours
Answer: C. 24 hours
Expert-Verified Explanation:
Lithium’s plasma half-life (the time it takes for the drug’s concentration to reduce by half
in the bloodstream) is typically around 24 hours in individuals with normal renal function.
This relatively medium-range half-life allows for once- or twice-daily dosing in many
cases. Adequate monitoring of serum lithium level is crucial because slight variations in
kidney function or fluid balance can significantly affect lithium levels and risk of toxicity.
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2) Fluoxetine is the SSRI with the ______ withdrawal risk, due to its long half-life.
A. Highest
B. Lowest
C. Moderate
D. No
Answer: B. Lowest
Expert-Verified Explanation:
Fluoxetine (Prozac) has one of the longest half-lives among SSRIs (about 2 weeks
when considering its active metabolite). A longer half-life means the medication exits the
body more gradually, typically resulting in fewer and less severe withdrawal symptoms
compared to shorter half-life antidepressants. This makes fluoxetine a commonly used
,“bridge” medication when trying to taper patients off SSRIs that have more pronounced
discontinuation syndromes.
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─
3) Which one of the following antipsychotics is incorrectly associated with a long half-
life?
A. Cariprazine (2–4 days; active metabolites up to 3 weeks)
B. Aripiprazole (≈3 days)
C. Risperidone (≈12–24 hours)
D. Brexipiprazole (≈4 days)
Answer: C. Risperidone (≈12–24 hours)
Expert-Verified Explanation:
Cariprazine, aripiprazole, brexipiprazole, pimozide, and pimavanserin are known for
their lengthy half-lives (ranging from about 2 days to several days, or even weeks for
active metabolites). These longer half-lives can be advantageous for patients who
occasionally miss doses because blood levels remain more stable. Risperidone,
conversely, has a shorter half-life of around 12–24 hours and can drop more quickly if
doses are missed.
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─
4) Disulfiram’s alcohol-interaction effects can persist for up to how long after the
medication is stopped?
A. 1 day
B. 2–3 days, up to 2 weeks
C. 4 weeks
D. 12 hours
,Answer: B. 2–3 days, up to 2 weeks
Expert-Verified Explanation:
Disulfiram (Antabuse) irreversibly inhibits aldehyde dehydrogenase, causing an
unpleasant reaction when alcohol is consumed. Its effects can remain active in the body
for 1–2 weeks after stopping regular dosing because the body must synthesize new
enzyme to replace the inhibited enzyme. Clinicians advise patients to avoid alcohol for
at least 14 days after discontinuation to prevent a severe disulfiram-alcohol reaction.
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─
5) Which TCA is known for having a long half-life?
A. Amitriptyline
B. Doxepin
C. Nortriptyline
D. Protriptyline (Vivactil)
Answer: D. Protriptyline (Vivactil)
Expert-Verified Explanation:
Protriptyline (Vivactil) is a lesser-prescribed tricyclic antidepressant but stands out for its
relatively long half-life among TCAs. This can influence dosing schedules and side-
effect profiles. TCAs in general must be monitored for anticholinergic side effects,
conduction abnormalities, and potential toxicity in overdose, but a longer half-life such
as protriptyline’s can also affect how quickly (or slowly) symptoms of toxicity or
withdrawal might present.
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─
6) Most psychotropics (including many psychiatric medications) have a “medium-range”
half-life of approximately…?
,A. 6 hours
B. 12 hours
C. 24 hours
D. 72 hours
Answer: C. 24 hours
Expert-Verified Explanation:
Many commonly prescribed psychiatric medications (e.g., many antidepressants, some
antipsychotics) hover around a 24-hour half-life. This daily turnover allows once- or
twice-daily dosing and generally consistent blood levels. However, variations in patient
metabolism, age, and comorbidities can shift this range somewhat, underscoring the
importance of correct dosing intervals.
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─
7) In relation to half-life, which best defines “steady state”?
A. When the drug has finished distribution in the body
B. When the drug is eliminated faster than it is absorbed
C. When elimination equals ingestion rate
D. When the drug starts causing side effects
Answer: C. When elimination equals ingestion rate
Expert-Verified Explanation:
Steady state is achieved when the amount of drug administered (or ingested) equals the
amount of drug eliminated over the same time period. Put another way, the blood
concentration plateaus because intake and clearance are balanced. For many drugs, it
takes about five half-lives to reach steady state.
, ───────────────────────────────────────────────────────
─
8) Lithium typically reaches its steady state after:
A. 3 half-lives
B. 5 half-lives
C. 7 half-lives
D. 10 half-lives
Answer: B. 5 half-lives
Expert-Verified Explanation:
For most medications, it generally takes around five half-lives to assume that the drug’s
plasma level is at steady state. Lithium follows this rule closely, meaning about five days
(given a ~24-hour half-life). Clinicians usually wait about five days before drawing a
definitive lithium level to ensure the reading reflects true steady-state concentration.
───────────────────────────────────────────────────────
─
9) Due to lithium steady-state principles, when do we draw a lithium blood level after
initiating or changing a dose?
A. 24 hours
B. 48 hours
C. 3 days
D. 5 half-lives (~5 days)
Answer: D. 5 half-lives (~5 days)
Expert-Verified Explanation:
If blood is drawn too soon, the level will not represent the ultimate steady-state
concentration. Lithium’s half-life is about 24 hours, so waiting approximately five days
captures the point where consistent daily dosing will accurately reflect the “true” stable
FINAL EXAM
Actual Questions and Answers
Expert-Verified Explanation
This Exam contains:
❖ Guarantee passing score
❖ 100 Questions and Answers
❖ format set of multiple-choice
❖ Expert-Verified Explanation
❖ Verified with trusted textbooks
,1) The half-life of lithium is about…?
A. 8 hours
B. 12 hours
C. 24 hours
D. 48 hours
Answer: C. 24 hours
Expert-Verified Explanation:
Lithium’s plasma half-life (the time it takes for the drug’s concentration to reduce by half
in the bloodstream) is typically around 24 hours in individuals with normal renal function.
This relatively medium-range half-life allows for once- or twice-daily dosing in many
cases. Adequate monitoring of serum lithium level is crucial because slight variations in
kidney function or fluid balance can significantly affect lithium levels and risk of toxicity.
───────────────────────────────────────────────────────
─
2) Fluoxetine is the SSRI with the ______ withdrawal risk, due to its long half-life.
A. Highest
B. Lowest
C. Moderate
D. No
Answer: B. Lowest
Expert-Verified Explanation:
Fluoxetine (Prozac) has one of the longest half-lives among SSRIs (about 2 weeks
when considering its active metabolite). A longer half-life means the medication exits the
body more gradually, typically resulting in fewer and less severe withdrawal symptoms
compared to shorter half-life antidepressants. This makes fluoxetine a commonly used
,“bridge” medication when trying to taper patients off SSRIs that have more pronounced
discontinuation syndromes.
───────────────────────────────────────────────────────
─
3) Which one of the following antipsychotics is incorrectly associated with a long half-
life?
A. Cariprazine (2–4 days; active metabolites up to 3 weeks)
B. Aripiprazole (≈3 days)
C. Risperidone (≈12–24 hours)
D. Brexipiprazole (≈4 days)
Answer: C. Risperidone (≈12–24 hours)
Expert-Verified Explanation:
Cariprazine, aripiprazole, brexipiprazole, pimozide, and pimavanserin are known for
their lengthy half-lives (ranging from about 2 days to several days, or even weeks for
active metabolites). These longer half-lives can be advantageous for patients who
occasionally miss doses because blood levels remain more stable. Risperidone,
conversely, has a shorter half-life of around 12–24 hours and can drop more quickly if
doses are missed.
───────────────────────────────────────────────────────
─
4) Disulfiram’s alcohol-interaction effects can persist for up to how long after the
medication is stopped?
A. 1 day
B. 2–3 days, up to 2 weeks
C. 4 weeks
D. 12 hours
,Answer: B. 2–3 days, up to 2 weeks
Expert-Verified Explanation:
Disulfiram (Antabuse) irreversibly inhibits aldehyde dehydrogenase, causing an
unpleasant reaction when alcohol is consumed. Its effects can remain active in the body
for 1–2 weeks after stopping regular dosing because the body must synthesize new
enzyme to replace the inhibited enzyme. Clinicians advise patients to avoid alcohol for
at least 14 days after discontinuation to prevent a severe disulfiram-alcohol reaction.
───────────────────────────────────────────────────────
─
5) Which TCA is known for having a long half-life?
A. Amitriptyline
B. Doxepin
C. Nortriptyline
D. Protriptyline (Vivactil)
Answer: D. Protriptyline (Vivactil)
Expert-Verified Explanation:
Protriptyline (Vivactil) is a lesser-prescribed tricyclic antidepressant but stands out for its
relatively long half-life among TCAs. This can influence dosing schedules and side-
effect profiles. TCAs in general must be monitored for anticholinergic side effects,
conduction abnormalities, and potential toxicity in overdose, but a longer half-life such
as protriptyline’s can also affect how quickly (or slowly) symptoms of toxicity or
withdrawal might present.
───────────────────────────────────────────────────────
─
6) Most psychotropics (including many psychiatric medications) have a “medium-range”
half-life of approximately…?
,A. 6 hours
B. 12 hours
C. 24 hours
D. 72 hours
Answer: C. 24 hours
Expert-Verified Explanation:
Many commonly prescribed psychiatric medications (e.g., many antidepressants, some
antipsychotics) hover around a 24-hour half-life. This daily turnover allows once- or
twice-daily dosing and generally consistent blood levels. However, variations in patient
metabolism, age, and comorbidities can shift this range somewhat, underscoring the
importance of correct dosing intervals.
───────────────────────────────────────────────────────
─
7) In relation to half-life, which best defines “steady state”?
A. When the drug has finished distribution in the body
B. When the drug is eliminated faster than it is absorbed
C. When elimination equals ingestion rate
D. When the drug starts causing side effects
Answer: C. When elimination equals ingestion rate
Expert-Verified Explanation:
Steady state is achieved when the amount of drug administered (or ingested) equals the
amount of drug eliminated over the same time period. Put another way, the blood
concentration plateaus because intake and clearance are balanced. For many drugs, it
takes about five half-lives to reach steady state.
, ───────────────────────────────────────────────────────
─
8) Lithium typically reaches its steady state after:
A. 3 half-lives
B. 5 half-lives
C. 7 half-lives
D. 10 half-lives
Answer: B. 5 half-lives
Expert-Verified Explanation:
For most medications, it generally takes around five half-lives to assume that the drug’s
plasma level is at steady state. Lithium follows this rule closely, meaning about five days
(given a ~24-hour half-life). Clinicians usually wait about five days before drawing a
definitive lithium level to ensure the reading reflects true steady-state concentration.
───────────────────────────────────────────────────────
─
9) Due to lithium steady-state principles, when do we draw a lithium blood level after
initiating or changing a dose?
A. 24 hours
B. 48 hours
C. 3 days
D. 5 half-lives (~5 days)
Answer: D. 5 half-lives (~5 days)
Expert-Verified Explanation:
If blood is drawn too soon, the level will not represent the ultimate steady-state
concentration. Lithium’s half-life is about 24 hours, so waiting approximately five days
captures the point where consistent daily dosing will accurately reflect the “true” stable
