NU 643 Exam 3 V1 | NU 643 Advanced
Psychopharmacology | Actual Q&A with
Rationale (NU643 Exam 3) | Regis
University
1. Which dopamine pathway is primarily responsible for the positive symptoms of
schizophrenia, such as hallucinations and delusions?
A. Nigrostriatal pathway
B. Tuberoinfundibular pathway
C. Mesocortical pathway
D. Mesolimbic pathway
Answer: D
Rationale: The mesolimbic pathway involves the projection of dopamine from the ventral
tegmental area to the nucleus accumbens. Hyperactivity in this specific pathway is
hypothesized to mediate the positive symptoms of psychosis. Antipsychotic medications
work by blocking D2 receptors in this area to reduce these symptoms.
2. A patient taking Lithium for Bipolar I Disorder presents with coarse tremors, ataxia, and
confusion. Which of the following serum lithium levels is most likely?
A. 0.8 mEq/L
B. 2.2 mEq/L
,C. 1.4 mEq/L
D. 1.1 mEq/L
Answer: B
Rationale: Lithium toxicity typically manifests when serum levels exceed 1.5 mEq/L, with
severe symptoms appearing above 2.0 mEq/L. Symptoms such as coarse tremors, ataxia,
and confusion are indicative of moderate to severe toxicity. Immediate intervention and
hydration are required to prevent permanent neurological damage or death.
3. When initiating Lamotrigine (Lamictal), why is a slow titration schedule strictly followed?
A. To avoid immediate weight gain
B. To prevent the development of Stevens-Johnson Syndrome (SJS)
C. To reduce the risk of hypertensive crisis
D. To allow the patient to adjust to sedative effects
Answer: B
Rationale: Lamotrigine carries a black box warning for serious dermatological reactions,
including Stevens-Johnson Syndrome. The risk of this life-threatening rash is significantly
increased if the initial dose is too high or if the titration is too rapid. Clinicians must follow
the standard 2-week incremental increases to ensure patient safety.
, 4. Which antipsychotic medication is considered the ‘gold standard’ for treatment-resistant
schizophrenia but requires ANC monitoring?
A. Risperidone
B. Clozapine
C. Olanzapine
D. Quetiapine
Answer: B
Rationale: Clozapine is the most effective antipsychotic for patients who have failed at
least two other trials. However, its use is restricted due to the risk of agranulocytosis, a
dangerous drop in white blood cell counts. Patients must be enrolled in a REMS program
and undergo regular Absolute Neutrophil Count (ANC) blood tests.
5. In the treatment of ADHD, what is the primary mechanism of action of Methylphenidate?
A. Inhibition of Monoamine Oxidase
B. Blockade of Dopamine and Norepinephrine Transporters
C. Antagonism of Postsynaptic D2 Receptors
D. Stimulation of GABA release
Answer: B
Rationale: Methylphenidate works by blocking the reuptake of dopamine and
norepinephrine by inhibiting their respective transporters (DAT and NET). This increases
Psychopharmacology | Actual Q&A with
Rationale (NU643 Exam 3) | Regis
University
1. Which dopamine pathway is primarily responsible for the positive symptoms of
schizophrenia, such as hallucinations and delusions?
A. Nigrostriatal pathway
B. Tuberoinfundibular pathway
C. Mesocortical pathway
D. Mesolimbic pathway
Answer: D
Rationale: The mesolimbic pathway involves the projection of dopamine from the ventral
tegmental area to the nucleus accumbens. Hyperactivity in this specific pathway is
hypothesized to mediate the positive symptoms of psychosis. Antipsychotic medications
work by blocking D2 receptors in this area to reduce these symptoms.
2. A patient taking Lithium for Bipolar I Disorder presents with coarse tremors, ataxia, and
confusion. Which of the following serum lithium levels is most likely?
A. 0.8 mEq/L
B. 2.2 mEq/L
,C. 1.4 mEq/L
D. 1.1 mEq/L
Answer: B
Rationale: Lithium toxicity typically manifests when serum levels exceed 1.5 mEq/L, with
severe symptoms appearing above 2.0 mEq/L. Symptoms such as coarse tremors, ataxia,
and confusion are indicative of moderate to severe toxicity. Immediate intervention and
hydration are required to prevent permanent neurological damage or death.
3. When initiating Lamotrigine (Lamictal), why is a slow titration schedule strictly followed?
A. To avoid immediate weight gain
B. To prevent the development of Stevens-Johnson Syndrome (SJS)
C. To reduce the risk of hypertensive crisis
D. To allow the patient to adjust to sedative effects
Answer: B
Rationale: Lamotrigine carries a black box warning for serious dermatological reactions,
including Stevens-Johnson Syndrome. The risk of this life-threatening rash is significantly
increased if the initial dose is too high or if the titration is too rapid. Clinicians must follow
the standard 2-week incremental increases to ensure patient safety.
, 4. Which antipsychotic medication is considered the ‘gold standard’ for treatment-resistant
schizophrenia but requires ANC monitoring?
A. Risperidone
B. Clozapine
C. Olanzapine
D. Quetiapine
Answer: B
Rationale: Clozapine is the most effective antipsychotic for patients who have failed at
least two other trials. However, its use is restricted due to the risk of agranulocytosis, a
dangerous drop in white blood cell counts. Patients must be enrolled in a REMS program
and undergo regular Absolute Neutrophil Count (ANC) blood tests.
5. In the treatment of ADHD, what is the primary mechanism of action of Methylphenidate?
A. Inhibition of Monoamine Oxidase
B. Blockade of Dopamine and Norepinephrine Transporters
C. Antagonism of Postsynaptic D2 Receptors
D. Stimulation of GABA release
Answer: B
Rationale: Methylphenidate works by blocking the reuptake of dopamine and
norepinephrine by inhibiting their respective transporters (DAT and NET). This increases
