WGU D345 Psychopharmacology for Advanced
Psychiatric Mental Health Practice – Post-Master's
Certificate Nursing PMHNP Study Guide, Original
Practice Questions & Answers, D345 Assessment
Preparation, Comprehensive Psychopharmacology
Review, Psychiatric Medications, Medication
Management, Therapeutic Drug Monitoring,
Adverse Effects, Drug Interactions, Prescribing
Principles & Advanced PMHNP Practice
Question 1: A 45-year-old patient with major depressive disorder has been on
a stable dose of fluoxetine for two years. They are started on warfarin for a
new diagnosis of atrial fibrillation. The PMHNP should monitor the patient
closely for which potential effect?
A. Reduced anticoagulant effect of warfarin
B. Increased risk of warfarin toxicity and bleeding
C. Decreased therapeutic effect of fluoxetine
D. No significant drug interaction is expected
CORRECT ANSWER: B. Increased risk of warfarin toxicity and bleeding
Rationale: Fluoxetine is a selective serotonin reuptake inhibitor (SSRI) that inhibits the
CYP2D6 and CYP2C9 isoenzymes. Warfarin is metabolized by CYP2C9 and is highly
protein-bound. SSRIs can displace warfarin from protein-binding sites and inhibit its
metabolism, leading to an increased international normalized ratio (INR) and a
heightened risk of bleeding. Option A is incorrect as the interaction increases, not
reduces, warfarin's effect. Option C is incorrect; the primary concern is the
anticoagulant effect. Option D is incorrect as this is a significant and well-documented
drug interaction.
Question 2: A patient is prescribed a new medication and the PMHNP explains
that it will take approximately 4 to 5 half-lives for the drug to reach a steady-
state concentration in the blood. This principle is best described as:
A. Pharmacodynamics
B. First-pass metabolism
C. Pharmacokinetics
D. Therapeutic index
CORRECT ANSWER: C. Pharmacokinetics
Rationale: Pharmacokinetics is the study of what the body does to a drug,
encompassing absorption, distribution, metabolism, and excretion (ADME). The
concept of half-life and the time required to reach steady-state concentration is a
fundamental pharmacokinetic principle . Pharmacodynamics (A) is the study of what the
,drug does to the body. First-pass metabolism (B) refers to the initial metabolism of a
drug in the liver. Therapeutic index (D) is a ratio comparing the toxic dose to the
therapeutic dose.
Question 3: A 28-year-old patient with borderline personality disorder reports
chronic emptiness, unstable relationships, and recurrent self-harming
behaviors. Which of the following is the primary, evidence-based rationale for
considering an atypical antipsychotic in this patient's treatment plan?
A. To address the core personality pathology
B. To stabilize mood and reduce impulsive, self-destructive behaviors
C. To correct a presumed underlying dopamine deficiency
D. To treat the co-occurring major depressive episodes
CORRECT ANSWER: B. To stabilize mood and reduce impulsive, self-
destructive behaviors
Rationale: In borderline personality disorder (BPD), atypical antipsychotics (e.g.,
aripiprazole, olanzapine) are used off-label primarily to target specific symptoms like
affective instability, impulsive aggression, and suicidal/self-harming behaviors. They are
not effective for the core personality pathology itself (A). The mechanism is more about
modulating neurotransmitter systems to reduce impulsivity and emotional dysregulation
rather than correcting a dopamine deficiency (C). While co-occurring depression is
common, antidepressants are a more typical first-line treatment for that specific aspect
(D) .
Question 4: A patient has been taking carbamazepine for a seizure disorder.
The PMHNP wants to start the patient on quetiapine for bipolar depression.
What effect on quetiapine levels should the PMHNP anticipate and what action
should be taken?
A. Carbamazepine will increase quetiapine levels, requiring a dose reduction.
B. Carbamazepine will decrease quetiapine levels, requiring a dose increase.
C. There is no significant interaction, and standard dosing is appropriate.
D. The combination is contraindicated due to a risk of agranulocytosis.
CORRECT ANSWER: B. Carbamazepine will decrease quetiapine levels,
requiring a dose increase.
Rationale: Carbamazepine is a potent inducer of the cytochrome P450 (CYP450)
enzyme system, specifically CYP3A4 . Quetiapine is metabolized by CYP3A4. Therefore,
carbamazepine will accelerate the metabolism of quetiapine, leading to significantly
reduced plasma concentrations. The PMHNP should anticipate the need for a higher
dose of quetiapine to achieve a therapeutic effect. Option A is incorrect as
carbamazepine is an inducer, not an inhibitor. Option C is incorrect as a significant
,interaction exists. Option D is incorrect as agranulocytosis is a risk with clozapine, not
typically a concern with quetiapine and carbamazepine.
Question 5: A 75-year-old patient with Alzheimer's disease is started on
donepezil. The PMHNP counsels the family about the most common side
effects, which are related to the drug's mechanism of action. These side effects
are:
A. Hepatotoxicity and renal failure
B. Bradycardia and gastrointestinal distress
C. Extrapyramidal symptoms and tardive dyskinesia
D. Hyponatremia and SIADH
CORRECT ANSWER: B. Bradycardia and gastrointestinal distress
Rationale: Donepezil is a cholinesterase inhibitor that works by increasing acetylcholine
levels in the brain. Acetylcholine is also a key neurotransmitter in the peripheral nervous
system, where it mediates functions in the heart (causing bradycardia) and the
gastrointestinal tract (causing nausea, vomiting, and diarrhea). These are the most
common and predictable side effects of this class of medication. Other options list side
effects associated with different drug classes.
Question 6: A 22-year-old woman is brought to the clinic by her mother, who
reports that over the past year, her daughter has become increasingly socially
withdrawn, has stopped showering, and has been speaking in a bizarre and
disorganized manner. The patient reports that the neighbors are broadcasting
her thoughts on the television. What is the most likely diagnosis?
A. Schizophreniform disorder
B. Brief psychotic disorder
C. Schizoaffective disorder
D. Schizophrenia
CORRECT ANSWER: D. Schizophrenia
Rationale: The patient is presenting with hallmark symptoms of schizophrenia: positive
symptoms (delusions of thought broadcasting), negative symptoms (social withdrawal,
poor hygiene), and disorganized behavior. The duration of symptoms is described as
over one year, which meets the DSM-5-TR criterion of continuous signs of disturbance
for at least six months to diagnose schizophrenia . Schizophreniform disorder (A) is
diagnosed when symptoms last for at least one month but less than six months. Brief
psychotic disorder (B) lasts from one day to one month. Schizoaffective disorder (C)
requires a mood episode concurrent with schizophrenia symptoms for a significant
portion of the illness.
, Question 7: A 60-year-old male with a history of alcohol use disorder presents
with confusion, ataxia, and nystagmus. His family reports he has been having
trouble with his memory and has been confabulating stories to fill in the gaps.
Which of the following is the most likely diagnosis?
A. Wernicke-Korsakoff syndrome
B. Alzheimer's disease
C. Vascular dementia
D. Frontotemporal dementia
CORRECT ANSWER: A. Wernicke-Korsakoff syndrome
Rationale: Wernicke-Korsakoff syndrome is a neuropsychiatric disorder caused by
thiamine (vitamin B1) deficiency, most commonly seen in patients with chronic alcohol
use disorder. Wernicke's encephalopathy is the acute phase, characterized by the classic
triad of confusion, ataxia, and ophthalmoplegia (nystagmus). Korsakoff's syndrome is the
chronic phase, characterized by profound anterograde and retrograde amnesia with
confabulation . The combination of ataxia, nystagmus, confabulation, and a history of
alcohol use disorder makes this diagnosis most likely.
Question 8: A 7-year-old child has had significant difficulty paying attention in
school since kindergarten. They often lose their homework, fidget constantly,
and interrupt others. Symptoms have been present since age 5. What is the
most likely diagnosis?
A. Oppositional defiant disorder
B. Attention-Deficit/Hyperactivity Disorder (ADHD), predominantly inattentive
presentation
C. Attention-Deficit/Hyperactivity Disorder (ADHD), combined presentation
D. Generalized anxiety disorder
CORRECT ANSWER: C. Attention-Deficit/Hyperactivity Disorder (ADHD),
combined presentation
Rationale: The patient's symptoms include both inattention (difficulty paying attention,
losing things) and hyperactivity/impulsivity (fidgeting, interrupting), which are present
in multiple settings and have been present for more than six months, with onset before
age 12. This presentation meets the criteria for ADHD, combined presentation . Option
A would not include the core inattention and hyperactivity symptoms. Option B only
addresses the inattention component. Option D would primarily involve excessive worry
and physical symptoms of anxiety, not the core symptoms of ADHD.
Question 9: A 40-year-old woman reports experiencing recurrent episodes
where she feels detached from her own body, as if she is an outside observer.
She also describes the world around her as feeling unreal and distorted. These
Psychiatric Mental Health Practice – Post-Master's
Certificate Nursing PMHNP Study Guide, Original
Practice Questions & Answers, D345 Assessment
Preparation, Comprehensive Psychopharmacology
Review, Psychiatric Medications, Medication
Management, Therapeutic Drug Monitoring,
Adverse Effects, Drug Interactions, Prescribing
Principles & Advanced PMHNP Practice
Question 1: A 45-year-old patient with major depressive disorder has been on
a stable dose of fluoxetine for two years. They are started on warfarin for a
new diagnosis of atrial fibrillation. The PMHNP should monitor the patient
closely for which potential effect?
A. Reduced anticoagulant effect of warfarin
B. Increased risk of warfarin toxicity and bleeding
C. Decreased therapeutic effect of fluoxetine
D. No significant drug interaction is expected
CORRECT ANSWER: B. Increased risk of warfarin toxicity and bleeding
Rationale: Fluoxetine is a selective serotonin reuptake inhibitor (SSRI) that inhibits the
CYP2D6 and CYP2C9 isoenzymes. Warfarin is metabolized by CYP2C9 and is highly
protein-bound. SSRIs can displace warfarin from protein-binding sites and inhibit its
metabolism, leading to an increased international normalized ratio (INR) and a
heightened risk of bleeding. Option A is incorrect as the interaction increases, not
reduces, warfarin's effect. Option C is incorrect; the primary concern is the
anticoagulant effect. Option D is incorrect as this is a significant and well-documented
drug interaction.
Question 2: A patient is prescribed a new medication and the PMHNP explains
that it will take approximately 4 to 5 half-lives for the drug to reach a steady-
state concentration in the blood. This principle is best described as:
A. Pharmacodynamics
B. First-pass metabolism
C. Pharmacokinetics
D. Therapeutic index
CORRECT ANSWER: C. Pharmacokinetics
Rationale: Pharmacokinetics is the study of what the body does to a drug,
encompassing absorption, distribution, metabolism, and excretion (ADME). The
concept of half-life and the time required to reach steady-state concentration is a
fundamental pharmacokinetic principle . Pharmacodynamics (A) is the study of what the
,drug does to the body. First-pass metabolism (B) refers to the initial metabolism of a
drug in the liver. Therapeutic index (D) is a ratio comparing the toxic dose to the
therapeutic dose.
Question 3: A 28-year-old patient with borderline personality disorder reports
chronic emptiness, unstable relationships, and recurrent self-harming
behaviors. Which of the following is the primary, evidence-based rationale for
considering an atypical antipsychotic in this patient's treatment plan?
A. To address the core personality pathology
B. To stabilize mood and reduce impulsive, self-destructive behaviors
C. To correct a presumed underlying dopamine deficiency
D. To treat the co-occurring major depressive episodes
CORRECT ANSWER: B. To stabilize mood and reduce impulsive, self-
destructive behaviors
Rationale: In borderline personality disorder (BPD), atypical antipsychotics (e.g.,
aripiprazole, olanzapine) are used off-label primarily to target specific symptoms like
affective instability, impulsive aggression, and suicidal/self-harming behaviors. They are
not effective for the core personality pathology itself (A). The mechanism is more about
modulating neurotransmitter systems to reduce impulsivity and emotional dysregulation
rather than correcting a dopamine deficiency (C). While co-occurring depression is
common, antidepressants are a more typical first-line treatment for that specific aspect
(D) .
Question 4: A patient has been taking carbamazepine for a seizure disorder.
The PMHNP wants to start the patient on quetiapine for bipolar depression.
What effect on quetiapine levels should the PMHNP anticipate and what action
should be taken?
A. Carbamazepine will increase quetiapine levels, requiring a dose reduction.
B. Carbamazepine will decrease quetiapine levels, requiring a dose increase.
C. There is no significant interaction, and standard dosing is appropriate.
D. The combination is contraindicated due to a risk of agranulocytosis.
CORRECT ANSWER: B. Carbamazepine will decrease quetiapine levels,
requiring a dose increase.
Rationale: Carbamazepine is a potent inducer of the cytochrome P450 (CYP450)
enzyme system, specifically CYP3A4 . Quetiapine is metabolized by CYP3A4. Therefore,
carbamazepine will accelerate the metabolism of quetiapine, leading to significantly
reduced plasma concentrations. The PMHNP should anticipate the need for a higher
dose of quetiapine to achieve a therapeutic effect. Option A is incorrect as
carbamazepine is an inducer, not an inhibitor. Option C is incorrect as a significant
,interaction exists. Option D is incorrect as agranulocytosis is a risk with clozapine, not
typically a concern with quetiapine and carbamazepine.
Question 5: A 75-year-old patient with Alzheimer's disease is started on
donepezil. The PMHNP counsels the family about the most common side
effects, which are related to the drug's mechanism of action. These side effects
are:
A. Hepatotoxicity and renal failure
B. Bradycardia and gastrointestinal distress
C. Extrapyramidal symptoms and tardive dyskinesia
D. Hyponatremia and SIADH
CORRECT ANSWER: B. Bradycardia and gastrointestinal distress
Rationale: Donepezil is a cholinesterase inhibitor that works by increasing acetylcholine
levels in the brain. Acetylcholine is also a key neurotransmitter in the peripheral nervous
system, where it mediates functions in the heart (causing bradycardia) and the
gastrointestinal tract (causing nausea, vomiting, and diarrhea). These are the most
common and predictable side effects of this class of medication. Other options list side
effects associated with different drug classes.
Question 6: A 22-year-old woman is brought to the clinic by her mother, who
reports that over the past year, her daughter has become increasingly socially
withdrawn, has stopped showering, and has been speaking in a bizarre and
disorganized manner. The patient reports that the neighbors are broadcasting
her thoughts on the television. What is the most likely diagnosis?
A. Schizophreniform disorder
B. Brief psychotic disorder
C. Schizoaffective disorder
D. Schizophrenia
CORRECT ANSWER: D. Schizophrenia
Rationale: The patient is presenting with hallmark symptoms of schizophrenia: positive
symptoms (delusions of thought broadcasting), negative symptoms (social withdrawal,
poor hygiene), and disorganized behavior. The duration of symptoms is described as
over one year, which meets the DSM-5-TR criterion of continuous signs of disturbance
for at least six months to diagnose schizophrenia . Schizophreniform disorder (A) is
diagnosed when symptoms last for at least one month but less than six months. Brief
psychotic disorder (B) lasts from one day to one month. Schizoaffective disorder (C)
requires a mood episode concurrent with schizophrenia symptoms for a significant
portion of the illness.
, Question 7: A 60-year-old male with a history of alcohol use disorder presents
with confusion, ataxia, and nystagmus. His family reports he has been having
trouble with his memory and has been confabulating stories to fill in the gaps.
Which of the following is the most likely diagnosis?
A. Wernicke-Korsakoff syndrome
B. Alzheimer's disease
C. Vascular dementia
D. Frontotemporal dementia
CORRECT ANSWER: A. Wernicke-Korsakoff syndrome
Rationale: Wernicke-Korsakoff syndrome is a neuropsychiatric disorder caused by
thiamine (vitamin B1) deficiency, most commonly seen in patients with chronic alcohol
use disorder. Wernicke's encephalopathy is the acute phase, characterized by the classic
triad of confusion, ataxia, and ophthalmoplegia (nystagmus). Korsakoff's syndrome is the
chronic phase, characterized by profound anterograde and retrograde amnesia with
confabulation . The combination of ataxia, nystagmus, confabulation, and a history of
alcohol use disorder makes this diagnosis most likely.
Question 8: A 7-year-old child has had significant difficulty paying attention in
school since kindergarten. They often lose their homework, fidget constantly,
and interrupt others. Symptoms have been present since age 5. What is the
most likely diagnosis?
A. Oppositional defiant disorder
B. Attention-Deficit/Hyperactivity Disorder (ADHD), predominantly inattentive
presentation
C. Attention-Deficit/Hyperactivity Disorder (ADHD), combined presentation
D. Generalized anxiety disorder
CORRECT ANSWER: C. Attention-Deficit/Hyperactivity Disorder (ADHD),
combined presentation
Rationale: The patient's symptoms include both inattention (difficulty paying attention,
losing things) and hyperactivity/impulsivity (fidgeting, interrupting), which are present
in multiple settings and have been present for more than six months, with onset before
age 12. This presentation meets the criteria for ADHD, combined presentation . Option
A would not include the core inattention and hyperactivity symptoms. Option B only
addresses the inattention component. Option D would primarily involve excessive worry
and physical symptoms of anxiety, not the core symptoms of ADHD.
Question 9: A 40-year-old woman reports experiencing recurrent episodes
where she feels detached from her own body, as if she is an outside observer.
She also describes the world around her as feeling unreal and distorted. These
