Regis College NU664C Family Psychiatric Mental Health I Exam
| Complete Practice Questions, Answers & Detailed Rationales
(2026/2027)
Question 1
Which Cytochrome P450 (CYP450) enzyme is most commonly
implicated in drug-drug interactions involving the metabolism of
numerous psychotropic medications, and acts as a potent inhibitor
when exposed to fluoxetine?
A. CYP3A4
B. CYP2D6
C. CYP1A2
D. CYP2C19
Correct Answer: B. CYP2D6
Detailed Rationale: CYP2D6 metabolizes a wide array of psychotropics,
including antidepressants and antipsychotics. Fluoxetine and paroxetine
are potent inhibitors of CYP2D6, which can lead to toxic plasma
concentrations of co-administered drugs metabolized by this pathway.
Question 2
What pharmacokinetic property determines the time required for
plasma concentrations of a drug to decrease by 50% after absorption
and distribution are complete?
A. Bioavailability
,B. Clearance
C. Half-life (𝑡1/2 )
D. Volume of distribution
Correct Answer: C. Half-life (𝑡1/2 )
Detailed Rationale: The elimination half-life is the time required for the
concentration of a drug in the body to drop by half, dictating dosing
frequency and steady-state attainment timelines.
Question 3
Hyperactivity within which dopaminergic neural pathway is primarily
responsible for the positive symptoms of schizophrenia and the
therapeutic target of antipsychotic medications?
A. Nigrostriatal pathway
B. Mesolimbic pathway
C. Tuberoinfundibular pathway
D. Mesocortical pathway
Correct Answer: B. Mesolimbic pathway
Detailed Rationale: The mesolimbic pathway projects from the ventral
tegmental area to the nucleus accumbens and is hyperactive in
schizophrenia, driving hallucinations and delusions. Antipsychotics exert
efficacy by blocking D2 receptors here.
Question 4
,During adolescence, which neurodevelopmental process undergoes
significant refinement in the prefrontal cortex, heavily influencing
impulse control, emotional regulation, and executive functioning?
A. Myelin degradation
B. Synaptic pruning and myelination
C. Unchecked neurogenesis
D. Ventricular enlargement
Correct Answer: B. Synaptic pruning and myelination
Detailed Rationale: Adolescence is marked by extensive synaptic
pruning (eliminating underutilized connections) and increased
myelination within prefrontal circuits, optimizing neural communication
for higher-order cognition.
Question 5
What specific clinical specifier for Major Depressive Disorder is
characterized by profound anhedonia, lack of reactivity to pleasurable
stimuli, early morning awakening, and significant weight loss?
A. Atypical features
B. Melancholic features
C. Psychotic features
D. Seasonal pattern
Correct Answer: B. Melancholic features
Detailed Rationale: Melancholic features represent a severe biological
subtype of depression distinguished by complete loss of pleasure in all
, activities, distinct morning worsening, and vegetative neurovegetative
signs.
Question 6
What is the required minimum duration of depressed mood for a
diagnosis of Persistent Depressive Disorder (Dysthymia) in adults?
A. At least 1 month
B. At least 6 months
C. At least 1 year
D. At least 2 years
Correct Answer: D. At least 2 years
Detailed Rationale: Persistent Depressive Disorder requires a chronic
depressed mood that occurs for most of the day, for more days than
not, for at least 2 years in adults (1 year in children and adolescents).
Question 7
How many distinct mood episodes within a 12-month period are
required to meet the DSM-5-TR diagnostic criteria for Bipolar I or
Bipolar II Disorder with "Rapid Cycling"?
A. At least 2 episodes
B. At least 4 episodes
C. At least 6 episodes
D. At least 10 episodes
Correct Answer: B. At least 4 episodes
| Complete Practice Questions, Answers & Detailed Rationales
(2026/2027)
Question 1
Which Cytochrome P450 (CYP450) enzyme is most commonly
implicated in drug-drug interactions involving the metabolism of
numerous psychotropic medications, and acts as a potent inhibitor
when exposed to fluoxetine?
A. CYP3A4
B. CYP2D6
C. CYP1A2
D. CYP2C19
Correct Answer: B. CYP2D6
Detailed Rationale: CYP2D6 metabolizes a wide array of psychotropics,
including antidepressants and antipsychotics. Fluoxetine and paroxetine
are potent inhibitors of CYP2D6, which can lead to toxic plasma
concentrations of co-administered drugs metabolized by this pathway.
Question 2
What pharmacokinetic property determines the time required for
plasma concentrations of a drug to decrease by 50% after absorption
and distribution are complete?
A. Bioavailability
,B. Clearance
C. Half-life (𝑡1/2 )
D. Volume of distribution
Correct Answer: C. Half-life (𝑡1/2 )
Detailed Rationale: The elimination half-life is the time required for the
concentration of a drug in the body to drop by half, dictating dosing
frequency and steady-state attainment timelines.
Question 3
Hyperactivity within which dopaminergic neural pathway is primarily
responsible for the positive symptoms of schizophrenia and the
therapeutic target of antipsychotic medications?
A. Nigrostriatal pathway
B. Mesolimbic pathway
C. Tuberoinfundibular pathway
D. Mesocortical pathway
Correct Answer: B. Mesolimbic pathway
Detailed Rationale: The mesolimbic pathway projects from the ventral
tegmental area to the nucleus accumbens and is hyperactive in
schizophrenia, driving hallucinations and delusions. Antipsychotics exert
efficacy by blocking D2 receptors here.
Question 4
,During adolescence, which neurodevelopmental process undergoes
significant refinement in the prefrontal cortex, heavily influencing
impulse control, emotional regulation, and executive functioning?
A. Myelin degradation
B. Synaptic pruning and myelination
C. Unchecked neurogenesis
D. Ventricular enlargement
Correct Answer: B. Synaptic pruning and myelination
Detailed Rationale: Adolescence is marked by extensive synaptic
pruning (eliminating underutilized connections) and increased
myelination within prefrontal circuits, optimizing neural communication
for higher-order cognition.
Question 5
What specific clinical specifier for Major Depressive Disorder is
characterized by profound anhedonia, lack of reactivity to pleasurable
stimuli, early morning awakening, and significant weight loss?
A. Atypical features
B. Melancholic features
C. Psychotic features
D. Seasonal pattern
Correct Answer: B. Melancholic features
Detailed Rationale: Melancholic features represent a severe biological
subtype of depression distinguished by complete loss of pleasure in all
, activities, distinct morning worsening, and vegetative neurovegetative
signs.
Question 6
What is the required minimum duration of depressed mood for a
diagnosis of Persistent Depressive Disorder (Dysthymia) in adults?
A. At least 1 month
B. At least 6 months
C. At least 1 year
D. At least 2 years
Correct Answer: D. At least 2 years
Detailed Rationale: Persistent Depressive Disorder requires a chronic
depressed mood that occurs for most of the day, for more days than
not, for at least 2 years in adults (1 year in children and adolescents).
Question 7
How many distinct mood episodes within a 12-month period are
required to meet the DSM-5-TR diagnostic criteria for Bipolar I or
Bipolar II Disorder with "Rapid Cycling"?
A. At least 2 episodes
B. At least 4 episodes
C. At least 6 episodes
D. At least 10 episodes
Correct Answer: B. At least 4 episodes
