200+ QUESTIONS & ANSWERS WITH
RATIONALES
, ATI RN PHARMACOLOGY MENTAL HEALTH FINAL EXAM 2026 | PRACTICE QUESTIONS &
ANSWERS WITH RATIONALES
1. A client taking lithium carbonate reports nausea, coarse hand tremors, and diarrhea. The
nurse should recognize these findings as consistent with which of the following?
A. Expected early side effects
B. Lithium toxicity
C. Serotonin syndrome
D. Neuroleptic malignant syndrome
Answer: B. Lithium toxicity
Rationale: Nausea, diarrhea, and especially a coarse tremor can indicate lithium toxicity.
Toxicity can progress to vomiting, ataxia, confusion, and other neurologic changes. Mild nausea
and fine tremors can occur early in therapy, but the described combination warrants concern
for toxicity.
2. A client is started on fluoxetine. Which instruction is most important for the nurse to
include?
A. "You may feel the full effect within 2–3 days."
B. "Full therapeutic effect may take 4–6 weeks."
C. "Stop the medication if you feel nauseated."
D. "Take this medication with grapefruit juice for better absorption."
Answer: B. "Full therapeutic effect may take 4–6 weeks."
Rationale: SSRIs such as fluoxetine generally require several weeks of consistent therapy before
the full antidepressant effect is achieved. Clients should understand that therapeutic benefits
may take time and should not discontinue treatment prematurely.
,3. A client on haloperidol develops a fever of 104°F (40°C), muscle rigidity, and altered mental
status. The nurse's priority action is to:
A. Administer an antipyretic and reassess in 1 hour
B. Withhold the next dose and notify the provider immediately
C. Increase oral fluids and monitor
D. Administer diphenhydramine
Answer: B. Withhold the next dose and notify the provider immediately
Rationale: Fever, severe muscle rigidity, and altered mental status in a client receiving an
antipsychotic are classic findings of neuroleptic malignant syndrome (NMS), a potentially life-
threatening emergency. The antipsychotic should be withheld and immediate medical
evaluation initiated.
4. Which client statement indicates a need for further teaching about monoamine oxidase
inhibitors (MAOIs)?
A. "I will avoid aged cheeses and cured meats."
B. "I can take a decongestant if I have a cold."
C. "I should notify my provider before starting any new medication."
D. "I will report a severe headache immediately."
Answer: B. "I can take a decongestant if I have a cold."
Rationale: Many decongestants can increase blood pressure and may cause a hypertensive
crisis when taken with MAOIs. Clients taking MAOIs should consult their provider before taking
new prescription or over-the-counter medications.
5. A client taking clozapine is due for a routine lab draw. Which lab value is the priority to
monitor?
A. Platelet count
B. Absolute neutrophil count (ANC)
C. Liver enzymes
D. Serum sodium
, Answer: B. Absolute neutrophil count (ANC)
Rationale: Clozapine can cause severe neutropenia/agranulocytosis, increasing the risk of
serious infection. Regular ANC monitoring is therefore a critical safety requirement during
clozapine therapy.
6. A client taking a benzodiazepine for anxiety asks how it works. The nurse's best
explanation is that benzodiazepines:
A. Increase serotonin reuptake
B. Block dopamine receptors
C. Enhance the effect of GABA
D. Inhibit monoamine oxidase
Answer: C. Enhance the effect of GABA
Rationale: Benzodiazepines enhance the inhibitory effects of gamma-aminobutyric acid
(GABA) at GABA-A receptors. This produces anxiolytic, sedative, anticonvulsant, and muscle-
relaxant effects.
7. A client on long-term benzodiazepine therapy is being discharged. Which teaching point is
essential?
A. "You can stop this medication abruptly once you feel better."
B. "Avoid alcohol while taking this medication."
C. "This medication is safe to combine with other CNS depressants."
D. "Tolerance will not develop with long-term use."
Answer: B. "Avoid alcohol while taking this medication."
Rationale: Benzodiazepines can cause significant CNS and respiratory depression, especially
when combined with alcohol or other CNS depressants. Long-term use can also lead to
tolerance, dependence, and withdrawal, so abrupt discontinuation should be avoided.
8. A client taking valproic acid for bipolar disorder should have which lab monitored
regularly?
RATIONALES
, ATI RN PHARMACOLOGY MENTAL HEALTH FINAL EXAM 2026 | PRACTICE QUESTIONS &
ANSWERS WITH RATIONALES
1. A client taking lithium carbonate reports nausea, coarse hand tremors, and diarrhea. The
nurse should recognize these findings as consistent with which of the following?
A. Expected early side effects
B. Lithium toxicity
C. Serotonin syndrome
D. Neuroleptic malignant syndrome
Answer: B. Lithium toxicity
Rationale: Nausea, diarrhea, and especially a coarse tremor can indicate lithium toxicity.
Toxicity can progress to vomiting, ataxia, confusion, and other neurologic changes. Mild nausea
and fine tremors can occur early in therapy, but the described combination warrants concern
for toxicity.
2. A client is started on fluoxetine. Which instruction is most important for the nurse to
include?
A. "You may feel the full effect within 2–3 days."
B. "Full therapeutic effect may take 4–6 weeks."
C. "Stop the medication if you feel nauseated."
D. "Take this medication with grapefruit juice for better absorption."
Answer: B. "Full therapeutic effect may take 4–6 weeks."
Rationale: SSRIs such as fluoxetine generally require several weeks of consistent therapy before
the full antidepressant effect is achieved. Clients should understand that therapeutic benefits
may take time and should not discontinue treatment prematurely.
,3. A client on haloperidol develops a fever of 104°F (40°C), muscle rigidity, and altered mental
status. The nurse's priority action is to:
A. Administer an antipyretic and reassess in 1 hour
B. Withhold the next dose and notify the provider immediately
C. Increase oral fluids and monitor
D. Administer diphenhydramine
Answer: B. Withhold the next dose and notify the provider immediately
Rationale: Fever, severe muscle rigidity, and altered mental status in a client receiving an
antipsychotic are classic findings of neuroleptic malignant syndrome (NMS), a potentially life-
threatening emergency. The antipsychotic should be withheld and immediate medical
evaluation initiated.
4. Which client statement indicates a need for further teaching about monoamine oxidase
inhibitors (MAOIs)?
A. "I will avoid aged cheeses and cured meats."
B. "I can take a decongestant if I have a cold."
C. "I should notify my provider before starting any new medication."
D. "I will report a severe headache immediately."
Answer: B. "I can take a decongestant if I have a cold."
Rationale: Many decongestants can increase blood pressure and may cause a hypertensive
crisis when taken with MAOIs. Clients taking MAOIs should consult their provider before taking
new prescription or over-the-counter medications.
5. A client taking clozapine is due for a routine lab draw. Which lab value is the priority to
monitor?
A. Platelet count
B. Absolute neutrophil count (ANC)
C. Liver enzymes
D. Serum sodium
, Answer: B. Absolute neutrophil count (ANC)
Rationale: Clozapine can cause severe neutropenia/agranulocytosis, increasing the risk of
serious infection. Regular ANC monitoring is therefore a critical safety requirement during
clozapine therapy.
6. A client taking a benzodiazepine for anxiety asks how it works. The nurse's best
explanation is that benzodiazepines:
A. Increase serotonin reuptake
B. Block dopamine receptors
C. Enhance the effect of GABA
D. Inhibit monoamine oxidase
Answer: C. Enhance the effect of GABA
Rationale: Benzodiazepines enhance the inhibitory effects of gamma-aminobutyric acid
(GABA) at GABA-A receptors. This produces anxiolytic, sedative, anticonvulsant, and muscle-
relaxant effects.
7. A client on long-term benzodiazepine therapy is being discharged. Which teaching point is
essential?
A. "You can stop this medication abruptly once you feel better."
B. "Avoid alcohol while taking this medication."
C. "This medication is safe to combine with other CNS depressants."
D. "Tolerance will not develop with long-term use."
Answer: B. "Avoid alcohol while taking this medication."
Rationale: Benzodiazepines can cause significant CNS and respiratory depression, especially
when combined with alcohol or other CNS depressants. Long-term use can also lead to
tolerance, dependence, and withdrawal, so abrupt discontinuation should be avoided.
8. A client taking valproic acid for bipolar disorder should have which lab monitored
regularly?
