NR546 MIDTERM PSYCHOPHARMACOLOGY
EXAM 200 QUESTIONS AND CORRECT
ANSWER WITH RATIONALE 2026/2027
ALREADY GRADED A+
1. A 34-year-old male recently began experiencing breast secretions while
receiving risperidone. Which dopamine pathway is associated with this side
effect?
A) Mesolimbic pathway
B) Mesocortical pathway
C) Nigrostriatal pathway
D) Tuberoinfundibular pathway
Answer D: Tuberoinfundibular pathway
Rationale: The tuberoinfundibular pathway regulates prolactin release.
Antipsychotic blockade of D2 receptors in this pathway disinhibits prolactin
secretion, causing galactorrhea and gynecomastia .
2. A drug that acts as an inverse agonist at a receptor will produce which of
the following effects?
A) The same effect as a neutral antagonist
B) Stabilization of the receptor in its inactive state, reducing constitutive activity
C) Blockade of the receptor without affecting baseline activity
,D) Activation of the receptor to a greater degree than a full agonist
Answer B: Stabilization of the receptor in its inactive state, reducing
constitutive activity
Rationale: An inverse agonist stabilizes a receptor in its inactive conformation,
reducing baseline (constitutive) activity. A neutral antagonist simply blocks agonist
binding without affecting constitutive activity .
3. The therapeutic effect of selective serotonin reuptake inhibitors (SSRIs) is
primarily mediated by which mechanism?
A) Upregulation of postsynaptic 5-HT2A receptors
B) Downregulation of presynaptic autoreceptors and desensitization
C) Immediate increase in synaptic serotonin
D) Antagonism of norepinephrine transporters
Answer B: Downregulation of presynaptic autoreceptors and desensitization
Rationale: While SSRIs immediately increase synaptic serotonin, the therapeutic
lag (2-4 weeks) is due to time required for presynaptic 5-HT1A autoreceptors to
desensitize, allowing sustained serotonergic transmission .
4. A patient who is a poor metabolizer (PM) of CYP2D6 substrates is
prescribed a drug metabolized by this enzyme. What is the most likely
outcome?
A) Reduced drug efficacy
B) Increased risk of adverse effects at standard doses
,C) Faster clearance of the drug
D) Reduced half-life
Answer B: Increased risk of adverse effects at standard doses
Rationale: Poor metabolizers have reduced or absent CYP2D6 enzyme activity,
leading to higher serum concentrations and prolonged half-life of CYP2D6
substrates, increasing risk of dose-dependent adverse effects .
5. Which of the following best describes pharmacodynamics?
A) The study of drug absorption, distribution, metabolism, and excretion
B) The study of what the drug does to the body, including receptor binding and
effects
C) The genetic variations that affect drug metabolism
D) The process of drug formulation and delivery
Answer B: The study of what the drug does to the body, including receptor
binding and effects
Rationale: Pharmacodynamics refers to biochemical and physiological effects of
drugs on the body, including receptor interactions, signal transduction, and dose-
response relationships. Pharmacokinetics describes what the body does to the
drug .
6. What is the most likely diagnosis when symptoms include hallucinations,
delusions, disorganized speech, disorganized behavior, and distortions of
reality?
, A) Major depressive disorder
B) Psychosis
C) Generalized anxiety disorder
D) Bipolar disorder
Answer B: Psychosis
Rationale: Psychosis is a syndrome that can be associated with several psychiatric
disorders. Symptoms include hallucinations, delusions, disorganized speech,
disorganized behavior, and distortions of reality. It can affect cognition, affective
response, communication, and ability to relate to others .
7. Which brain structure is most associated with long-term memory?
A) Amygdala
B) Hippocampus
C) Hypothalamus
D) Cerebellum
Answer B: Hippocampus
Rationale: The hippocampus is critical for the consolidation of long-term memory.
Damage to this structure impairs the ability to form new memories .
8. What is Wernicke's area associated with?
A) Speech production
B) Speech comprehension
C) Motor function
EXAM 200 QUESTIONS AND CORRECT
ANSWER WITH RATIONALE 2026/2027
ALREADY GRADED A+
1. A 34-year-old male recently began experiencing breast secretions while
receiving risperidone. Which dopamine pathway is associated with this side
effect?
A) Mesolimbic pathway
B) Mesocortical pathway
C) Nigrostriatal pathway
D) Tuberoinfundibular pathway
Answer D: Tuberoinfundibular pathway
Rationale: The tuberoinfundibular pathway regulates prolactin release.
Antipsychotic blockade of D2 receptors in this pathway disinhibits prolactin
secretion, causing galactorrhea and gynecomastia .
2. A drug that acts as an inverse agonist at a receptor will produce which of
the following effects?
A) The same effect as a neutral antagonist
B) Stabilization of the receptor in its inactive state, reducing constitutive activity
C) Blockade of the receptor without affecting baseline activity
,D) Activation of the receptor to a greater degree than a full agonist
Answer B: Stabilization of the receptor in its inactive state, reducing
constitutive activity
Rationale: An inverse agonist stabilizes a receptor in its inactive conformation,
reducing baseline (constitutive) activity. A neutral antagonist simply blocks agonist
binding without affecting constitutive activity .
3. The therapeutic effect of selective serotonin reuptake inhibitors (SSRIs) is
primarily mediated by which mechanism?
A) Upregulation of postsynaptic 5-HT2A receptors
B) Downregulation of presynaptic autoreceptors and desensitization
C) Immediate increase in synaptic serotonin
D) Antagonism of norepinephrine transporters
Answer B: Downregulation of presynaptic autoreceptors and desensitization
Rationale: While SSRIs immediately increase synaptic serotonin, the therapeutic
lag (2-4 weeks) is due to time required for presynaptic 5-HT1A autoreceptors to
desensitize, allowing sustained serotonergic transmission .
4. A patient who is a poor metabolizer (PM) of CYP2D6 substrates is
prescribed a drug metabolized by this enzyme. What is the most likely
outcome?
A) Reduced drug efficacy
B) Increased risk of adverse effects at standard doses
,C) Faster clearance of the drug
D) Reduced half-life
Answer B: Increased risk of adverse effects at standard doses
Rationale: Poor metabolizers have reduced or absent CYP2D6 enzyme activity,
leading to higher serum concentrations and prolonged half-life of CYP2D6
substrates, increasing risk of dose-dependent adverse effects .
5. Which of the following best describes pharmacodynamics?
A) The study of drug absorption, distribution, metabolism, and excretion
B) The study of what the drug does to the body, including receptor binding and
effects
C) The genetic variations that affect drug metabolism
D) The process of drug formulation and delivery
Answer B: The study of what the drug does to the body, including receptor
binding and effects
Rationale: Pharmacodynamics refers to biochemical and physiological effects of
drugs on the body, including receptor interactions, signal transduction, and dose-
response relationships. Pharmacokinetics describes what the body does to the
drug .
6. What is the most likely diagnosis when symptoms include hallucinations,
delusions, disorganized speech, disorganized behavior, and distortions of
reality?
, A) Major depressive disorder
B) Psychosis
C) Generalized anxiety disorder
D) Bipolar disorder
Answer B: Psychosis
Rationale: Psychosis is a syndrome that can be associated with several psychiatric
disorders. Symptoms include hallucinations, delusions, disorganized speech,
disorganized behavior, and distortions of reality. It can affect cognition, affective
response, communication, and ability to relate to others .
7. Which brain structure is most associated with long-term memory?
A) Amygdala
B) Hippocampus
C) Hypothalamus
D) Cerebellum
Answer B: Hippocampus
Rationale: The hippocampus is critical for the consolidation of long-term memory.
Damage to this structure impairs the ability to form new memories .
8. What is Wernicke's area associated with?
A) Speech production
B) Speech comprehension
C) Motor function
