NR546 | NR546 Advanced Pharmacology
Psychopharmacology for the PMHNP Week 4 Exam
1 | Questions with Correct Answers and Expert
Explanation for Each Question | Chamberlain
1. A patient is prescribed Fluoxetine. Which pharmacokinetic property is unique to this
SSRI compared to others in its class?
A. It has a long half-life and an active metabolite
B. It has a very short half-life
C. It is only available in IV formulation
D. It does not interact with the CYP450 system
Correct Answer: A
Expert Explanation: Fluoxetine and its active metabolite norfluoxetine have a
significantly longer half-life than other SSRIs. This long duration of action provides a
built-in taper that reduces the risk of discontinuation syndrome. Because of this, it is
often a preferred choice for patients who may occasionally miss a dose.
2. Which neurotransmitter is primarily associated with the ‘reward’ pathway in the
brain?
A. Serotonin
B. Acetylcholine
,C. GABA
D. Dopamine
Correct Answer: D
Expert Explanation: Dopamine is the primary neurotransmitter involved in the
mesolimbic reward circuit. Increased levels of dopamine in the nucleus accumbens
are associated with pleasure and reinforcement. This pathway plays a critical role in
both natural rewards and the addictive properties of drugs.
3. A patient on an MAOI should avoid foods rich in which substance to prevent a
hypertensive crisis?
A. Tyramine
B. Tryptophan
C. Glutamine
D. Phenylalanine
Correct Answer: A
Expert Explanation: Tyramine is a precursor to norepinephrine and can cause a
massive release of catecholamines if not broken down by monoamine oxidase.
When MAO is inhibited, tyramine levels rise, leading to dangerous increases in blood
,pressure. Patients must avoid aged cheeses, cured meats, and fermented products
while on these medications.
4. What is the primary mechanism of action for Benzodiazepines?
A. Inhibition of Serotonin reuptake
B. Antagonism of NMDA receptors
C. Positive allosteric modulation of GABA-A receptors
D. Agonism of Alpha-2 receptors
Correct Answer: C
Expert Explanation: Benzodiazepines work by binding to a specific site on the
GABA-A receptor complex. This binding increases the frequency of chloride channel
opening in the presence of GABA, enhancing inhibitory neurotransmission. This
mechanism results in the sedative, anxiolytic, and muscle-relaxant effects of the
drug class.
5. Which cytochrome P450 enzyme is most commonly involved in the metabolism of
approximately 50% of all clinical drugs?
A. CYP2D6
B. CYP1A2
C. CYP3A4
, D. CYP2C19
Correct Answer: C
Expert Explanation: CYP3A4 is the most abundant and clinically significant enzyme
in the cytochrome P450 system. It is responsible for the metabolism of a vast array
of psychotropic and non-psychotropic medications. Understanding its inhibitors and
inducers is crucial for preventing dangerous drug-drug interactions.
6. Which side effect is a major concern with the use of Lamotrigine?
A. Agranulocytosis
B. Stevens-Johnson Syndrome (SJS)
C. Hyperprolactinemia
D. Priapism
Correct Answer: B
Expert Explanation: Lamotrigine carries a black box warning for serious and
potentially life-threatening rashes, including Stevens-Johnson Syndrome. The risk is
minimized by following a very slow titration schedule over several weeks. Patients
must be educated to report any new skin changes or mucosal lesions immediately.
Psychopharmacology for the PMHNP Week 4 Exam
1 | Questions with Correct Answers and Expert
Explanation for Each Question | Chamberlain
1. A patient is prescribed Fluoxetine. Which pharmacokinetic property is unique to this
SSRI compared to others in its class?
A. It has a long half-life and an active metabolite
B. It has a very short half-life
C. It is only available in IV formulation
D. It does not interact with the CYP450 system
Correct Answer: A
Expert Explanation: Fluoxetine and its active metabolite norfluoxetine have a
significantly longer half-life than other SSRIs. This long duration of action provides a
built-in taper that reduces the risk of discontinuation syndrome. Because of this, it is
often a preferred choice for patients who may occasionally miss a dose.
2. Which neurotransmitter is primarily associated with the ‘reward’ pathway in the
brain?
A. Serotonin
B. Acetylcholine
,C. GABA
D. Dopamine
Correct Answer: D
Expert Explanation: Dopamine is the primary neurotransmitter involved in the
mesolimbic reward circuit. Increased levels of dopamine in the nucleus accumbens
are associated with pleasure and reinforcement. This pathway plays a critical role in
both natural rewards and the addictive properties of drugs.
3. A patient on an MAOI should avoid foods rich in which substance to prevent a
hypertensive crisis?
A. Tyramine
B. Tryptophan
C. Glutamine
D. Phenylalanine
Correct Answer: A
Expert Explanation: Tyramine is a precursor to norepinephrine and can cause a
massive release of catecholamines if not broken down by monoamine oxidase.
When MAO is inhibited, tyramine levels rise, leading to dangerous increases in blood
,pressure. Patients must avoid aged cheeses, cured meats, and fermented products
while on these medications.
4. What is the primary mechanism of action for Benzodiazepines?
A. Inhibition of Serotonin reuptake
B. Antagonism of NMDA receptors
C. Positive allosteric modulation of GABA-A receptors
D. Agonism of Alpha-2 receptors
Correct Answer: C
Expert Explanation: Benzodiazepines work by binding to a specific site on the
GABA-A receptor complex. This binding increases the frequency of chloride channel
opening in the presence of GABA, enhancing inhibitory neurotransmission. This
mechanism results in the sedative, anxiolytic, and muscle-relaxant effects of the
drug class.
5. Which cytochrome P450 enzyme is most commonly involved in the metabolism of
approximately 50% of all clinical drugs?
A. CYP2D6
B. CYP1A2
C. CYP3A4
, D. CYP2C19
Correct Answer: C
Expert Explanation: CYP3A4 is the most abundant and clinically significant enzyme
in the cytochrome P450 system. It is responsible for the metabolism of a vast array
of psychotropic and non-psychotropic medications. Understanding its inhibitors and
inducers is crucial for preventing dangerous drug-drug interactions.
6. Which side effect is a major concern with the use of Lamotrigine?
A. Agranulocytosis
B. Stevens-Johnson Syndrome (SJS)
C. Hyperprolactinemia
D. Priapism
Correct Answer: B
Expert Explanation: Lamotrigine carries a black box warning for serious and
potentially life-threatening rashes, including Stevens-Johnson Syndrome. The risk is
minimized by following a very slow titration schedule over several weeks. Patients
must be educated to report any new skin changes or mucosal lesions immediately.
