NU 643 Exam 1 V1 | NU 643 Advanced
Psychopharmacology | Actual Q&A with Rationale
(NU643 Exam 1) | Regis University
1. Which neurotransmitter is primarily implicated in the reward system and the
pathophysiology of schizophrenia within the mesolimbic pathway?
A. Dopamine
B. Norepinephrine
C. Serotonin
D. GABA
Correct Answer: A
Explanation: Dopamine is the key neurotransmitter associated with the brain’s reward
system and is central to the dopamine hypothesis of schizophrenia. Overactivity in the
mesolimbic pathway is associated with positive symptoms like hallucinations and
delusions. Understanding this pathway is essential for selecting appropriate antipsychotic
treatments in clinical practice.
2. A patient is prescribed a medication that acts as a Cytochrome P450 2D6 inhibitor. Which
of the following drugs would have increased plasma levels if co-administered?
A. Risperidone
B. Fluoxetine
,C. Carbamazepine
D. Rifampin
Correct Answer: A
Explanation: Risperidone is a primary substrate for the CYP2D6 enzyme, meaning its
metabolism is slowed by inhibitors. Fluoxetine itself is a potent inhibitor of 2D6, which
would exacerbate the levels of substrates like risperidone or certain beta-blockers.
Clinicians must monitor for increased side effects or toxicity when these two classes of
medications are used concurrently.
3. Which mechanism of action describes an ‘inverse agonist’ in psychopharmacology?
A. It binds to the receptor and produces the opposite effect of an agonist.
B. It produces the same effect as the agonist but at a lower intensity.
C. It blocks the agonist from binding to the receptor.
D. It binds to a different site to enhance the agonist effect.
Correct Answer: A
Explanation: An inverse agonist binds to the same receptor as an agonist but induces a
pharmacological response opposite to that of the agonist. This is distinct from an
antagonist, which merely blocks the receptor without inducing a response of its own. This
concept is vital for understanding medications that modulate GABA receptors in anxiety
disorders.
, 4. Which brain region is most associated with the regulation of executive functions, such as
planning and impulse control?
A. Hippocampus
B. Prefrontal Cortex
C. Amygdala
D. Thalamus
Correct Answer: B
Explanation: The prefrontal cortex is responsible for higher-order cognitive processes
including decision making and personality expression. Dysfunction in this area is often
linked to the negative symptoms and cognitive deficits seen in schizophrenia. Advanced
psychopharmacology targets this area to improve functional outcomes in psychiatric
patients.
5. A patient experiencing ‘lead-pipe’ muscle rigidity, high fever, and autonomic instability is
likely suffering from which condition?
A. Serotonin Syndrome
B. Akathisia
C. Extrapyramidal Symptoms (EPS)
D. Neuroleptic Malignant Syndrome (NMS)
Correct Answer: D
Psychopharmacology | Actual Q&A with Rationale
(NU643 Exam 1) | Regis University
1. Which neurotransmitter is primarily implicated in the reward system and the
pathophysiology of schizophrenia within the mesolimbic pathway?
A. Dopamine
B. Norepinephrine
C. Serotonin
D. GABA
Correct Answer: A
Explanation: Dopamine is the key neurotransmitter associated with the brain’s reward
system and is central to the dopamine hypothesis of schizophrenia. Overactivity in the
mesolimbic pathway is associated with positive symptoms like hallucinations and
delusions. Understanding this pathway is essential for selecting appropriate antipsychotic
treatments in clinical practice.
2. A patient is prescribed a medication that acts as a Cytochrome P450 2D6 inhibitor. Which
of the following drugs would have increased plasma levels if co-administered?
A. Risperidone
B. Fluoxetine
,C. Carbamazepine
D. Rifampin
Correct Answer: A
Explanation: Risperidone is a primary substrate for the CYP2D6 enzyme, meaning its
metabolism is slowed by inhibitors. Fluoxetine itself is a potent inhibitor of 2D6, which
would exacerbate the levels of substrates like risperidone or certain beta-blockers.
Clinicians must monitor for increased side effects or toxicity when these two classes of
medications are used concurrently.
3. Which mechanism of action describes an ‘inverse agonist’ in psychopharmacology?
A. It binds to the receptor and produces the opposite effect of an agonist.
B. It produces the same effect as the agonist but at a lower intensity.
C. It blocks the agonist from binding to the receptor.
D. It binds to a different site to enhance the agonist effect.
Correct Answer: A
Explanation: An inverse agonist binds to the same receptor as an agonist but induces a
pharmacological response opposite to that of the agonist. This is distinct from an
antagonist, which merely blocks the receptor without inducing a response of its own. This
concept is vital for understanding medications that modulate GABA receptors in anxiety
disorders.
, 4. Which brain region is most associated with the regulation of executive functions, such as
planning and impulse control?
A. Hippocampus
B. Prefrontal Cortex
C. Amygdala
D. Thalamus
Correct Answer: B
Explanation: The prefrontal cortex is responsible for higher-order cognitive processes
including decision making and personality expression. Dysfunction in this area is often
linked to the negative symptoms and cognitive deficits seen in schizophrenia. Advanced
psychopharmacology targets this area to improve functional outcomes in psychiatric
patients.
5. A patient experiencing ‘lead-pipe’ muscle rigidity, high fever, and autonomic instability is
likely suffering from which condition?
A. Serotonin Syndrome
B. Akathisia
C. Extrapyramidal Symptoms (EPS)
D. Neuroleptic Malignant Syndrome (NMS)
Correct Answer: D
