NSG552 / NSG 552 Exam 3:
Psychopharmacology – Wilkes Actual Exam
Complete Review with Questions & Verified
Answers | Grade A | Pass Guaranteed - A+ Graded
Neurobiology & Mechanisms of Action
Q1: A student asks why Selective Serotonin Reuptake Inhibitors (SSRIs) are considered
first-line for depression despite having a similar mechanism to older tricyclics. Which
explanation best describes the pharmacologic advantage of SSRIs regarding receptor
affinity?
A. SSRIs have a high affinity for histamine H1 receptors, which improves sleep quality.
B. SSRIs selectively block the serotonin transporter with minimal affinity for muscarinic
and alpha-adrenergic receptors.
C. SSRIs potently inhibit the reuptake of norepinephrine, providing more energy than
dopamine agonists.
D. SSRIs act as full agonists at the 5-HT1A receptor, immediately reducing anxiety
symptoms.
Correct Answer: B
Rationale: The best answer is SSRIs selectively block the serotonin transporter with
minimal affinity for muscarinic and alpha-adrenergic receptors because this selectivity is
what separates them from the tricyclics and explains their better side effect profile.
Remember that the bothersome anticholinergic and orthostatic side effects of TCAs
come from their "dirty" binding to those other receptors.
Q2: When reviewing the neurobiology of schizophrenia, we discuss the dopamine
hypothesis. Which pathway is primarily responsible for the positive symptoms of the
disorder, such as hallucinations and delusions?
A. Nigrostriatal pathway
B. Mesocortical pathway
C. Mesolimbic pathway
D. Tuberoinfundibular pathway
Correct Answer: C
Rationale: This matches the receptor profile because the mesolimbic pathway is where
excess dopamine activity is most strongly linked to psychosis and positive symptoms. In
,psychopharmacology, we start with the understanding that blocking D2 receptors here
helps "turn down the volume" on those hallucinations.
Q3: A patient is prescribed a medication that acts as a partial agonist at the dopamine
D2 receptor. To explain this mechanism to the patient, which analogy would be most
accurate?
A. It acts like a key that breaks the lock, so the door never opens.
B. It fits in the lock but only turns it halfway, opening the door slightly.
C. It prevents the natural key from entering the lock entirely.
D. It forces the door open regardless of whether a key is present.
Correct Answer: B
Rationale: The best answer is it fits in the lock but only turns it halfway, opening the
door slightly because a partial agonist stimulates the receptor but to a lesser degree
than a full agonist (like dopamine). This mechanism is functional in stabilizing dopamine
levels, which is useful in both psychosis and depression.
Q4: You are teaching a class about the role of GABA in anxiety disorders.
Benzodiazepines enhance the effect of GABA. What is the specific result of this
enhancement on the neuron?
A. Inhibition of adenylate cyclase, reducing cAMP levels.
B. Hyperpolarization of the neuron, making it less likely to fire.
C. Blocking of sodium channels, preventing action potential propagation.
D. Direct stimulation of the chloride channel opening without GABA.
Correct Answer: B
Rationale: The best answer is hyperpolarization of the neuron, making it less likely to
fire, because when benzodiazepines bind to the GABA-A receptor, they increase the
frequency of chloride channel opening. This influx of negative charges calms the CNS
activity, which is why we see the sedative and anxiolytic effects.
Q5: Which of the following correctly describes the mechanism of action of buspirone,
distinguishing it from benzodiazepines?
A. It is a full agonist at the benzodiazepine site of the GABA-A receptor.
B. It acts as a serotonin 5-HT1A partial agonist.
C. It blocks the reuptake of serotonin and norepinephrine.
D. It is a potent antagonist at the dopamine D2 receptor.
Correct Answer: B
Rationale: The best answer is it acts as a serotonin 5-HT1A partial agonist because
buspirone works specifically on serotonin receptors rather than the GABA system. This
is why it doesn't cause sedation or physical dependence like the benzos do, making it a
safer long-term option for some patients.
, Q6: [DATA SNIPPET]
A 45-year-old patient is stable on Lithium. He presents with a sinus infection and the
resident physician prescribes Clarithromycin. You consult the CYP450 interaction table
below:
Medication Primary CYP Metabolism Enzyme Activity Effect
Lithium None (Renal excretion) N/A
Clarithromycin 3A4 Strong Inhibitor
Theophylline 1A2 Substrate
Duloxetine 1A2, 2D6 Substrate
Based on this data, which interaction is the priority concern?
A. Clarithromycin will increase levels of Lithium, causing toxicity.
B. Clarithromycin will increase levels of Theophylline if the patient takes it.
C. Clarithromycin will decrease the efficacy of Duloxetine.
D. There is no direct CYP interaction between Clarithromycin and Lithium.
Correct Answer: D
Psychopharmacology – Wilkes Actual Exam
Complete Review with Questions & Verified
Answers | Grade A | Pass Guaranteed - A+ Graded
Neurobiology & Mechanisms of Action
Q1: A student asks why Selective Serotonin Reuptake Inhibitors (SSRIs) are considered
first-line for depression despite having a similar mechanism to older tricyclics. Which
explanation best describes the pharmacologic advantage of SSRIs regarding receptor
affinity?
A. SSRIs have a high affinity for histamine H1 receptors, which improves sleep quality.
B. SSRIs selectively block the serotonin transporter with minimal affinity for muscarinic
and alpha-adrenergic receptors.
C. SSRIs potently inhibit the reuptake of norepinephrine, providing more energy than
dopamine agonists.
D. SSRIs act as full agonists at the 5-HT1A receptor, immediately reducing anxiety
symptoms.
Correct Answer: B
Rationale: The best answer is SSRIs selectively block the serotonin transporter with
minimal affinity for muscarinic and alpha-adrenergic receptors because this selectivity is
what separates them from the tricyclics and explains their better side effect profile.
Remember that the bothersome anticholinergic and orthostatic side effects of TCAs
come from their "dirty" binding to those other receptors.
Q2: When reviewing the neurobiology of schizophrenia, we discuss the dopamine
hypothesis. Which pathway is primarily responsible for the positive symptoms of the
disorder, such as hallucinations and delusions?
A. Nigrostriatal pathway
B. Mesocortical pathway
C. Mesolimbic pathway
D. Tuberoinfundibular pathway
Correct Answer: C
Rationale: This matches the receptor profile because the mesolimbic pathway is where
excess dopamine activity is most strongly linked to psychosis and positive symptoms. In
,psychopharmacology, we start with the understanding that blocking D2 receptors here
helps "turn down the volume" on those hallucinations.
Q3: A patient is prescribed a medication that acts as a partial agonist at the dopamine
D2 receptor. To explain this mechanism to the patient, which analogy would be most
accurate?
A. It acts like a key that breaks the lock, so the door never opens.
B. It fits in the lock but only turns it halfway, opening the door slightly.
C. It prevents the natural key from entering the lock entirely.
D. It forces the door open regardless of whether a key is present.
Correct Answer: B
Rationale: The best answer is it fits in the lock but only turns it halfway, opening the
door slightly because a partial agonist stimulates the receptor but to a lesser degree
than a full agonist (like dopamine). This mechanism is functional in stabilizing dopamine
levels, which is useful in both psychosis and depression.
Q4: You are teaching a class about the role of GABA in anxiety disorders.
Benzodiazepines enhance the effect of GABA. What is the specific result of this
enhancement on the neuron?
A. Inhibition of adenylate cyclase, reducing cAMP levels.
B. Hyperpolarization of the neuron, making it less likely to fire.
C. Blocking of sodium channels, preventing action potential propagation.
D. Direct stimulation of the chloride channel opening without GABA.
Correct Answer: B
Rationale: The best answer is hyperpolarization of the neuron, making it less likely to
fire, because when benzodiazepines bind to the GABA-A receptor, they increase the
frequency of chloride channel opening. This influx of negative charges calms the CNS
activity, which is why we see the sedative and anxiolytic effects.
Q5: Which of the following correctly describes the mechanism of action of buspirone,
distinguishing it from benzodiazepines?
A. It is a full agonist at the benzodiazepine site of the GABA-A receptor.
B. It acts as a serotonin 5-HT1A partial agonist.
C. It blocks the reuptake of serotonin and norepinephrine.
D. It is a potent antagonist at the dopamine D2 receptor.
Correct Answer: B
Rationale: The best answer is it acts as a serotonin 5-HT1A partial agonist because
buspirone works specifically on serotonin receptors rather than the GABA system. This
is why it doesn't cause sedation or physical dependence like the benzos do, making it a
safer long-term option for some patients.
, Q6: [DATA SNIPPET]
A 45-year-old patient is stable on Lithium. He presents with a sinus infection and the
resident physician prescribes Clarithromycin. You consult the CYP450 interaction table
below:
Medication Primary CYP Metabolism Enzyme Activity Effect
Lithium None (Renal excretion) N/A
Clarithromycin 3A4 Strong Inhibitor
Theophylline 1A2 Substrate
Duloxetine 1A2, 2D6 Substrate
Based on this data, which interaction is the priority concern?
A. Clarithromycin will increase levels of Lithium, causing toxicity.
B. Clarithromycin will increase levels of Theophylline if the patient takes it.
C. Clarithromycin will decrease the efficacy of Duloxetine.
D. There is no direct CYP interaction between Clarithromycin and Lithium.
Correct Answer: D
