NSG552 / NSG 552 Exam 2 Psychopharmacology |
Grade A Questions and Verified Answers | 100%
Correct – Wilkes Actual Exam – Complete Q&A with
Detailed Rationales – Pass Guaranteed – A+ Graded
Foundations: Pharmacokinetics, Pharmacodynamics & Neurobiology
Q1: Which dopamine pathway is primarily responsible for the development of
extrapyramidal symptoms (EPS) when blocked by antipsychotic medications?
A. Mesolimbic pathway
B. Tuberoinfundibular pathway
C. Nigrostriatal pathway [CORRECT]
D. Mesocortical pathway
Correct Answer: C
Rationale: The best answer is C, because the nigrostriatal pathway regulates motor
movement, and when D2 receptors are blocked here, it leads to EPS like dystonia and
parkinsonism, whereas the mesolimbic pathway is associated with positive psychotic
symptoms.
Q2: A PMHNP student is explaining the mechanism of benzodiazepines to a patient.
Which statement accurately describes how benzodiazepines exert their effect at the
cellular level?
A. They directly bind to and activate the GABA-A receptor chloride channel
independently of GABA.
B. They act as positive allosteric modulators, increasing the frequency of chloride
channel opening when GABA is present. [CORRECT]
C. They block the reuptake of GABA into the presynaptic neuron, increasing synaptic
GABA levels.
D. They act as GABA-A receptor antagonists, preventing hyperpolarization of the
neuron.
Correct Answer: B
Rationale: This is correct because benzodiazepines do not open the channel directly;
rather, they bind to a specific allosteric site that enhances the natural inhibitory effect of
GABA, leading to increased chloride influx and neuronal hyperpolarization.
,Q3: A patient with treatment-resistant depression is being considered for intranasal
ketamine. What is the primary neurotransmitter system through which ketamine is
believed to exert its rapid antidepressant effect?
A. Serotonin reuptake inhibition
B. NMDA receptor antagonism leading to a glutamate surge [CORRECT]
C. Dopamine D2 receptor partial agonism
D. Norepinephrine reuptake inhibition
Correct Answer: B
Rationale: The best answer is B, because the glutamate hypothesis of depression
suggests that ketamine's blockade of NMDA receptors causes a rapid increase in
synaptic glutamate, which triggers downstream signaling that promotes synaptic
plasticity and rapid mood improvement.
Q4: A patient recently started on a new antidepressant complains that the medication
isn't working after 10 days. The PMHNP explains that the medication needs to reach
steady state. Approximately how long does it take a medication with an average half-life
of 24 hours to reach steady state?
A. 24 hours
B. 5 to 7 days [CORRECT]
C. 14 days
D. 30 days
Correct Answer: B
Rationale: This aligns with pharmacokinetic principles, because it generally takes four to
five half-lives for a drug to reach steady state in the body; for a drug with a 24-hour
half-life, this equates to roughly 5 to 7 days.
Q5: A PMHNP is reviewing a patient's chart and notes they are a CYP2D6 poor
metabolizer. The patient is prescribed paroxetine. What is the primary clinical concern in
this scenario?
A. The patient will clear the medication too quickly, requiring a higher dose.
B. The patient is at high risk for serotonin syndrome due to impaired drug clearance.
[CORRECT]
C. The medication will be completely ineffective due to lack of activation.
D. The patient will experience severe anticholinergic effects only.
Correct Answer: B
Rationale: The best answer is B, because poor metabolizers lack the functional enzyme
to break down the medication, leading to unexpectedly high plasma levels of the drug
and a significantly increased risk of toxicity and serotonin syndrome.
Q6: A patient taking fluoxetine reports starting St. John's Wort for mild mood
improvement. What is the most likely pharmacokinetic interaction?
, A. St. John's Wort inhibits CYP3A4, leading to toxic fluoxetine levels.
B. St. John's Wort induces CYP3A4, leading to decreased fluoxetine levels and
potential loss of efficacy. [CORRECT]
C. St. John's Wort blocks the SERT, causing serotonin syndrome immediately.
D. There is no interaction because they use different metabolic pathways.
Correct Answer: B
Rationale: This is correct because St. John's Wort is a potent inducer of the CYP3A4
isoenzyme system, which can significantly increase the metabolism and clearance of
substrates like fluoxetine, reducing their therapeutic effectiveness.
Q7: When comparing phase I and phase II hepatic metabolism, which of the following
best describes phase II reactions?
A. Oxidation, reduction, and hydrolysis via CYP450 enzymes
B. Conjugation reactions, such as glucuronidation or sulfation, that make the drug more
water-soluble for excretion [CORRECT]
C. The process of a drug moving from the gut into the portal circulation
D. The active transport of drugs out of the hepatocytes into the bile
Correct Answer: B
Rationale: The best answer is B, because phase II metabolism involves conjugating the
drug or its phase I metabolites with polar molecules, which directly makes the
compound more hydrophilic so the kidneys can easily excrete it.
Q8: Why are highly lipophilic psychotropic medications able to exert their effects on the
central nervous system?
A. They bind tightly to plasma proteins, which transport them across the blood-brain
barrier.
B. They are actively pumped across the blood-brain barrier by specific transporter
proteins.
C. Their lipid solubility allows them to passively diffuse across the blood-brain barrier.
[CORRECT]
D. They have a high volume of distribution in the blood stream.
Correct Answer: C
Rationale: This aligns with pharmacokinetic principles, as the blood-brain barrier is
composed of tightly packed lipid membranes; lipophilic drugs can easily dissolve into
and pass through these membranes to reach their site of action in the brain.
Q9: Which of the following selective serotonin reuptake inhibitors is considered a potent
inhibitor of the CYP2D6 isoenzyme and therefore carries the highest risk of increasing
levels of other CYP2D6 substrates?
A. Escitalopram
B. Sertraline
Grade A Questions and Verified Answers | 100%
Correct – Wilkes Actual Exam – Complete Q&A with
Detailed Rationales – Pass Guaranteed – A+ Graded
Foundations: Pharmacokinetics, Pharmacodynamics & Neurobiology
Q1: Which dopamine pathway is primarily responsible for the development of
extrapyramidal symptoms (EPS) when blocked by antipsychotic medications?
A. Mesolimbic pathway
B. Tuberoinfundibular pathway
C. Nigrostriatal pathway [CORRECT]
D. Mesocortical pathway
Correct Answer: C
Rationale: The best answer is C, because the nigrostriatal pathway regulates motor
movement, and when D2 receptors are blocked here, it leads to EPS like dystonia and
parkinsonism, whereas the mesolimbic pathway is associated with positive psychotic
symptoms.
Q2: A PMHNP student is explaining the mechanism of benzodiazepines to a patient.
Which statement accurately describes how benzodiazepines exert their effect at the
cellular level?
A. They directly bind to and activate the GABA-A receptor chloride channel
independently of GABA.
B. They act as positive allosteric modulators, increasing the frequency of chloride
channel opening when GABA is present. [CORRECT]
C. They block the reuptake of GABA into the presynaptic neuron, increasing synaptic
GABA levels.
D. They act as GABA-A receptor antagonists, preventing hyperpolarization of the
neuron.
Correct Answer: B
Rationale: This is correct because benzodiazepines do not open the channel directly;
rather, they bind to a specific allosteric site that enhances the natural inhibitory effect of
GABA, leading to increased chloride influx and neuronal hyperpolarization.
,Q3: A patient with treatment-resistant depression is being considered for intranasal
ketamine. What is the primary neurotransmitter system through which ketamine is
believed to exert its rapid antidepressant effect?
A. Serotonin reuptake inhibition
B. NMDA receptor antagonism leading to a glutamate surge [CORRECT]
C. Dopamine D2 receptor partial agonism
D. Norepinephrine reuptake inhibition
Correct Answer: B
Rationale: The best answer is B, because the glutamate hypothesis of depression
suggests that ketamine's blockade of NMDA receptors causes a rapid increase in
synaptic glutamate, which triggers downstream signaling that promotes synaptic
plasticity and rapid mood improvement.
Q4: A patient recently started on a new antidepressant complains that the medication
isn't working after 10 days. The PMHNP explains that the medication needs to reach
steady state. Approximately how long does it take a medication with an average half-life
of 24 hours to reach steady state?
A. 24 hours
B. 5 to 7 days [CORRECT]
C. 14 days
D. 30 days
Correct Answer: B
Rationale: This aligns with pharmacokinetic principles, because it generally takes four to
five half-lives for a drug to reach steady state in the body; for a drug with a 24-hour
half-life, this equates to roughly 5 to 7 days.
Q5: A PMHNP is reviewing a patient's chart and notes they are a CYP2D6 poor
metabolizer. The patient is prescribed paroxetine. What is the primary clinical concern in
this scenario?
A. The patient will clear the medication too quickly, requiring a higher dose.
B. The patient is at high risk for serotonin syndrome due to impaired drug clearance.
[CORRECT]
C. The medication will be completely ineffective due to lack of activation.
D. The patient will experience severe anticholinergic effects only.
Correct Answer: B
Rationale: The best answer is B, because poor metabolizers lack the functional enzyme
to break down the medication, leading to unexpectedly high plasma levels of the drug
and a significantly increased risk of toxicity and serotonin syndrome.
Q6: A patient taking fluoxetine reports starting St. John's Wort for mild mood
improvement. What is the most likely pharmacokinetic interaction?
, A. St. John's Wort inhibits CYP3A4, leading to toxic fluoxetine levels.
B. St. John's Wort induces CYP3A4, leading to decreased fluoxetine levels and
potential loss of efficacy. [CORRECT]
C. St. John's Wort blocks the SERT, causing serotonin syndrome immediately.
D. There is no interaction because they use different metabolic pathways.
Correct Answer: B
Rationale: This is correct because St. John's Wort is a potent inducer of the CYP3A4
isoenzyme system, which can significantly increase the metabolism and clearance of
substrates like fluoxetine, reducing their therapeutic effectiveness.
Q7: When comparing phase I and phase II hepatic metabolism, which of the following
best describes phase II reactions?
A. Oxidation, reduction, and hydrolysis via CYP450 enzymes
B. Conjugation reactions, such as glucuronidation or sulfation, that make the drug more
water-soluble for excretion [CORRECT]
C. The process of a drug moving from the gut into the portal circulation
D. The active transport of drugs out of the hepatocytes into the bile
Correct Answer: B
Rationale: The best answer is B, because phase II metabolism involves conjugating the
drug or its phase I metabolites with polar molecules, which directly makes the
compound more hydrophilic so the kidneys can easily excrete it.
Q8: Why are highly lipophilic psychotropic medications able to exert their effects on the
central nervous system?
A. They bind tightly to plasma proteins, which transport them across the blood-brain
barrier.
B. They are actively pumped across the blood-brain barrier by specific transporter
proteins.
C. Their lipid solubility allows them to passively diffuse across the blood-brain barrier.
[CORRECT]
D. They have a high volume of distribution in the blood stream.
Correct Answer: C
Rationale: This aligns with pharmacokinetic principles, as the blood-brain barrier is
composed of tightly packed lipid membranes; lipophilic drugs can easily dissolve into
and pass through these membranes to reach their site of action in the brain.
Q9: Which of the following selective serotonin reuptake inhibitors is considered a potent
inhibitor of the CYP2D6 isoenzyme and therefore carries the highest risk of increasing
levels of other CYP2D6 substrates?
A. Escitalopram
B. Sertraline
