NR 546 Psychopharmacology for the Psychiatric-Mental
Health Nurse Practitioner – Chamberlain College of
Nursing – Midterm Exam 1
Question 1: A 34-year-old woman with major depressive disorder has been
prescribed an SSRI. The PMHNP understands that the therapeutic effect of
SSRIs is mediated through which downstream cellular mechanism?
A. Direct agonist activity at postsynaptic 5-HT2A receptors
B. Inhibition of monoamine oxidase type A in the presynaptic terminal
C. Blockade of serotonin reuptake at the postsynaptic membrane
D. Desensitization of presynaptic 5-HT1A autoreceptors leading to increased
serotonergic neurotransmission
CORRECT ANSWER: D. Desensitization of presynaptic 5-HT1A autoreceptors
leading to increased serotonergic neurotransmission
Rationale: SSRIs block the serotonin transporter (SERT), increasing synaptic serotonin.
Initially, this increase activates presynaptic 5-HT1A autoreceptors, which inhibit further
serotonin release. With chronic treatment (typically 2-4 weeks), these autoreceptors
desensitize, allowing full enhancement of serotonergic neurotransmission. This delayed
desensitization explains the therapeutic lag of SSRIs .
Question 2: A 42-year-old man with schizophrenia has elevated prolactin
levels causing gynecomastia and galactorrhea. His current antipsychotic
medication is known to block dopamine D2 receptors. Which mechanism
explains the hyperprolactinemia?
A. Histamine H1 receptor antagonism increases prolactin synthesis
B. Dopamine normally inhibits prolactin release; D2 blockade removes this inhibitory
tone
C. Dopamine stimulates prolactin release; D2 blockade enhances pituitary function
D. Serotonin reuptake inhibition increases prolactin-releasing hormone
CORRECT ANSWER: B. Dopamine normally inhibits prolactin release; D2
blockade removes this inhibitory tone
Rationale: In the tuberoinfundibular pathway, dopamine acts as a prolactin-inhibiting
factor (PIF) by binding to D2 receptors on lactotroph cells in the anterior pituitary. When
antipsychotics block these D2 receptors, the inhibitory tone on prolactin secretion is
removed, leading to hyperprolactinemia and its clinical consequences such as
gynecomastia and galactorrhea .
Question 3: A psychiatric nurse practitioner is teaching a patient about the
blood-brain barrier and psychotropic drug delivery. Lipophilicity of a
medication most directly determines which pharmacokinetic property?
A. Affinity for receptor binding sites on postsynaptic membranes
B. Duration of action in the synaptic cleft before reuptake
C. Ability to cross the blood-brain barrier and reach central nervous system targets
D. Rate of hepatic metabolism by cytochrome P450 enzymes
,CORRECT ANSWER: C. Ability to cross the blood-brain barrier and reach
central nervous system targets
Rationale: The blood-brain barrier consists of endothelial tight junctions that restrict
paracellular transport. Lipophilic (fat-soluble) drugs can passively diffuse through
endothelial cell membranes of the BBB, while hydrophilic drugs cannot. Most
psychotropic medications are designed to be lipophilic to ensure adequate CNS
penetration .
Question 4: A 28-year-old patient with bipolar disorder is prescribed a
medication that blocks voltage-gated sodium channels and inhibits glutamate
release. This mechanism of action is most consistent with which medication?
A. Carbamazepine
B. Lithium carbonate
C. Valproic acid
D. Lamotrigine
CORRECT ANSWER: D. Lamotrigine
Rationale: Lamotrigine blocks voltage-gated sodium channels, which stabilizes
neuronal membranes and inhibits the release of excitatory neurotransmitters,
particularly glutamate. This mechanism is thought to underlie its efficacy in bipolar
depression and maintenance treatment. Carbamazepine and valproic acid have different
primary mechanisms, and lithium works through distinct signaling pathways .
Question 5: A patient on lamotrigine for bipolar depression develops a
widespread maculopapular rash. What is the priority action for the PMHNP?
A. Continue the medication and add antihistamines
B. Reduce the dose by 50%
C. Discontinue lamotrigine immediately
D. Switch to valproate
CORRECT ANSWER: C. Discontinue lamotrigine immediately
Rationale: Lamotrigine can cause serious, life-threatening rashes including Stevens-
Johnson syndrome. The risk is increased with rapid dose titration and concurrent
valproate use. Any rash that develops should prompt immediate discontinuation. Slow
titration is essential to minimize this risk .
Question 6: Which statement correctly pairs the pharmacodynamic effect with
its definition?
A. Antagonist effect - drug binds to receptor and activates a response
B. Antagonist effect - drug binds to receptor, but does not activate a response
C. Agonist effect - drug binds to receptor and blocks the endogenous ligand
D. Partial agonist effect - drug binds to receptor with maximum efficacy equal to full
agonist
, CORRECT ANSWER: B. Antagonist effect - drug binds to receptor, but does not
activate a response
Rationale: An antagonist binds to a receptor but does not activate it, thereby blocking
the receptor from being activated by endogenous ligands or agonists. An agonist binds
and activates a response. A partial agonist binds and produces a submaximal response
even when all receptors are occupied .
Question 7: A major current hypothesis for the pathophysiology of
schizophrenia proposes that N-methyl-D-aspartate (NMDA) receptors may be
which of the following?
A. Hyperfunctional in the prefrontal cortex
B. Hypofunctional, contributing to glutamate dysregulation
C. Overactive in the mesolimbic pathway
D. Functionally normal but excessively abundant
CORRECT ANSWER: B. Hypofunctional, contributing to glutamate
dysregulation
Rationale: The NMDA receptor hypofunction hypothesis of schizophrenia suggests that
reduced glutamatergic signaling via NMDA receptors leads to downstream
dopaminergic dysregulation. This is supported by the fact that NMDA receptor
antagonists like phencyclidine (PCP) and ketamine can produce psychotic symptoms
resembling schizophrenia .
Question 8: A 22-year-old patient recently diagnosed with bipolar disorder
states "I'm not crazy" and is refusing to take his prescribed medication. Which
type of factor is contributing to this patient's nonadherence?
A. Client factors
B. Clinician factors
C. Structural factors
D. Environmental factors
CORRECT ANSWER: A. Client factors
Rationale: Client factors contributing to medication nonadherence include lack of
insight into the illness, denial of the diagnosis, negative attitudes toward medication, and
cognitive impairments. The patient's statement reflects anosognosia (lack of insight) and
denial, which are client-related factors. Clinician factors involve communication style,
structural factors relate to healthcare access, and environmental factors involve social
support .
Question 9: A patient with generalized anxiety disorder is started on
buspirone. The PMHNP explains that the onset of therapeutic effect is
typically:
A. 1 hour
B. 1-2 days
Health Nurse Practitioner – Chamberlain College of
Nursing – Midterm Exam 1
Question 1: A 34-year-old woman with major depressive disorder has been
prescribed an SSRI. The PMHNP understands that the therapeutic effect of
SSRIs is mediated through which downstream cellular mechanism?
A. Direct agonist activity at postsynaptic 5-HT2A receptors
B. Inhibition of monoamine oxidase type A in the presynaptic terminal
C. Blockade of serotonin reuptake at the postsynaptic membrane
D. Desensitization of presynaptic 5-HT1A autoreceptors leading to increased
serotonergic neurotransmission
CORRECT ANSWER: D. Desensitization of presynaptic 5-HT1A autoreceptors
leading to increased serotonergic neurotransmission
Rationale: SSRIs block the serotonin transporter (SERT), increasing synaptic serotonin.
Initially, this increase activates presynaptic 5-HT1A autoreceptors, which inhibit further
serotonin release. With chronic treatment (typically 2-4 weeks), these autoreceptors
desensitize, allowing full enhancement of serotonergic neurotransmission. This delayed
desensitization explains the therapeutic lag of SSRIs .
Question 2: A 42-year-old man with schizophrenia has elevated prolactin
levels causing gynecomastia and galactorrhea. His current antipsychotic
medication is known to block dopamine D2 receptors. Which mechanism
explains the hyperprolactinemia?
A. Histamine H1 receptor antagonism increases prolactin synthesis
B. Dopamine normally inhibits prolactin release; D2 blockade removes this inhibitory
tone
C. Dopamine stimulates prolactin release; D2 blockade enhances pituitary function
D. Serotonin reuptake inhibition increases prolactin-releasing hormone
CORRECT ANSWER: B. Dopamine normally inhibits prolactin release; D2
blockade removes this inhibitory tone
Rationale: In the tuberoinfundibular pathway, dopamine acts as a prolactin-inhibiting
factor (PIF) by binding to D2 receptors on lactotroph cells in the anterior pituitary. When
antipsychotics block these D2 receptors, the inhibitory tone on prolactin secretion is
removed, leading to hyperprolactinemia and its clinical consequences such as
gynecomastia and galactorrhea .
Question 3: A psychiatric nurse practitioner is teaching a patient about the
blood-brain barrier and psychotropic drug delivery. Lipophilicity of a
medication most directly determines which pharmacokinetic property?
A. Affinity for receptor binding sites on postsynaptic membranes
B. Duration of action in the synaptic cleft before reuptake
C. Ability to cross the blood-brain barrier and reach central nervous system targets
D. Rate of hepatic metabolism by cytochrome P450 enzymes
,CORRECT ANSWER: C. Ability to cross the blood-brain barrier and reach
central nervous system targets
Rationale: The blood-brain barrier consists of endothelial tight junctions that restrict
paracellular transport. Lipophilic (fat-soluble) drugs can passively diffuse through
endothelial cell membranes of the BBB, while hydrophilic drugs cannot. Most
psychotropic medications are designed to be lipophilic to ensure adequate CNS
penetration .
Question 4: A 28-year-old patient with bipolar disorder is prescribed a
medication that blocks voltage-gated sodium channels and inhibits glutamate
release. This mechanism of action is most consistent with which medication?
A. Carbamazepine
B. Lithium carbonate
C. Valproic acid
D. Lamotrigine
CORRECT ANSWER: D. Lamotrigine
Rationale: Lamotrigine blocks voltage-gated sodium channels, which stabilizes
neuronal membranes and inhibits the release of excitatory neurotransmitters,
particularly glutamate. This mechanism is thought to underlie its efficacy in bipolar
depression and maintenance treatment. Carbamazepine and valproic acid have different
primary mechanisms, and lithium works through distinct signaling pathways .
Question 5: A patient on lamotrigine for bipolar depression develops a
widespread maculopapular rash. What is the priority action for the PMHNP?
A. Continue the medication and add antihistamines
B. Reduce the dose by 50%
C. Discontinue lamotrigine immediately
D. Switch to valproate
CORRECT ANSWER: C. Discontinue lamotrigine immediately
Rationale: Lamotrigine can cause serious, life-threatening rashes including Stevens-
Johnson syndrome. The risk is increased with rapid dose titration and concurrent
valproate use. Any rash that develops should prompt immediate discontinuation. Slow
titration is essential to minimize this risk .
Question 6: Which statement correctly pairs the pharmacodynamic effect with
its definition?
A. Antagonist effect - drug binds to receptor and activates a response
B. Antagonist effect - drug binds to receptor, but does not activate a response
C. Agonist effect - drug binds to receptor and blocks the endogenous ligand
D. Partial agonist effect - drug binds to receptor with maximum efficacy equal to full
agonist
, CORRECT ANSWER: B. Antagonist effect - drug binds to receptor, but does not
activate a response
Rationale: An antagonist binds to a receptor but does not activate it, thereby blocking
the receptor from being activated by endogenous ligands or agonists. An agonist binds
and activates a response. A partial agonist binds and produces a submaximal response
even when all receptors are occupied .
Question 7: A major current hypothesis for the pathophysiology of
schizophrenia proposes that N-methyl-D-aspartate (NMDA) receptors may be
which of the following?
A. Hyperfunctional in the prefrontal cortex
B. Hypofunctional, contributing to glutamate dysregulation
C. Overactive in the mesolimbic pathway
D. Functionally normal but excessively abundant
CORRECT ANSWER: B. Hypofunctional, contributing to glutamate
dysregulation
Rationale: The NMDA receptor hypofunction hypothesis of schizophrenia suggests that
reduced glutamatergic signaling via NMDA receptors leads to downstream
dopaminergic dysregulation. This is supported by the fact that NMDA receptor
antagonists like phencyclidine (PCP) and ketamine can produce psychotic symptoms
resembling schizophrenia .
Question 8: A 22-year-old patient recently diagnosed with bipolar disorder
states "I'm not crazy" and is refusing to take his prescribed medication. Which
type of factor is contributing to this patient's nonadherence?
A. Client factors
B. Clinician factors
C. Structural factors
D. Environmental factors
CORRECT ANSWER: A. Client factors
Rationale: Client factors contributing to medication nonadherence include lack of
insight into the illness, denial of the diagnosis, negative attitudes toward medication, and
cognitive impairments. The patient's statement reflects anosognosia (lack of insight) and
denial, which are client-related factors. Clinician factors involve communication style,
structural factors relate to healthcare access, and environmental factors involve social
support .
Question 9: A patient with generalized anxiety disorder is started on
buspirone. The PMHNP explains that the onset of therapeutic effect is
typically:
A. 1 hour
B. 1-2 days
