NRNP 6635 COMPREHENSIVE
PSYCHOPHARMACOLOGY EXAM 2026
QUESTIONS AND ANSWERS
1. Which dopaminergic pathway is primarily associated with the positive symptoms of
schizophrenia and is the target for antipsychotic efficacy?
A. Mesolimbic pathway
B. Mesocortical pathway
C. Nigrostriatal pathway
D. Tuberoinfundibular pathway
Answer: A
Conceptual Explanation: The mesolimbic pathway, characterized by projections from the
ventral tegmental area to the nucleus accumbens, is associated with reward and psychosis;
overactivity here leads to positive symptoms.
2. A patient taking Lithium presents with coarse tremors, ataxia, and confusion. What is the
most likely cause?
A. Lithium toxicity
,B. Therapeutic side effects
C. Serotonin syndrome
D. Neuroleptic malignant syndrome
Answer: A
Conceptual Explanation: Coarse tremors, ataxia, and confusion are hallmark signs of
Lithium toxicity, which can occur when serum levels exceed the narrow therapeutic index.
3. Which cytochrome P450 enzyme is responsible for the metabolism of approximately 25%
of all psychiatric medications, including many SSRIs and TCAs?
A. CYP2D6
B. CYP1A2
C. CYP2C19
D. CYP3A4
Answer: A
Conceptual Explanation: CYP2D6 is a major enzyme in psychotropic metabolism; genetic
polymorphisms in this enzyme lead to variations in drug response among poor and ultra-
rapid metabolizers.
4. Clozapine requires frequent blood monitoring primarily to screen for which life-threatening
condition?
A. Thrombocytopenia
, B. Hepatotoxicity
C. Nephrotoxicity
D. Agranulocytosis
Answer: D
Conceptual Explanation: Clozapine is associated with a 1% risk of agranulocytosis,
requiring strict Absolute Neutrophil Count (ANC) monitoring via the REMS program.
5. What is the mechanism of action of Varenicline in the treatment of nicotine dependence?
A. Full agonist at Alpha-7 nicotinic receptors
B. Antagonist at NMDA receptors
C. Partial agonist at Alpha-4 Beta-2 nicotinic receptors
D. Inhibitor of dopamine reuptake
Answer: C
Conceptual Explanation: Varenicline acts as a partial agonist at alpha-4 beta-2 nicotinic
acetylcholine receptors, reducing cravings while blocking the reinforcing effects of nicotine.
6. Which antidepressant is uniquely known for its Alpha-2 antagonism, resulting in increased
release of norepinephrine and serotonin?
A. Bupropion
B. Mirtazapine
PSYCHOPHARMACOLOGY EXAM 2026
QUESTIONS AND ANSWERS
1. Which dopaminergic pathway is primarily associated with the positive symptoms of
schizophrenia and is the target for antipsychotic efficacy?
A. Mesolimbic pathway
B. Mesocortical pathway
C. Nigrostriatal pathway
D. Tuberoinfundibular pathway
Answer: A
Conceptual Explanation: The mesolimbic pathway, characterized by projections from the
ventral tegmental area to the nucleus accumbens, is associated with reward and psychosis;
overactivity here leads to positive symptoms.
2. A patient taking Lithium presents with coarse tremors, ataxia, and confusion. What is the
most likely cause?
A. Lithium toxicity
,B. Therapeutic side effects
C. Serotonin syndrome
D. Neuroleptic malignant syndrome
Answer: A
Conceptual Explanation: Coarse tremors, ataxia, and confusion are hallmark signs of
Lithium toxicity, which can occur when serum levels exceed the narrow therapeutic index.
3. Which cytochrome P450 enzyme is responsible for the metabolism of approximately 25%
of all psychiatric medications, including many SSRIs and TCAs?
A. CYP2D6
B. CYP1A2
C. CYP2C19
D. CYP3A4
Answer: A
Conceptual Explanation: CYP2D6 is a major enzyme in psychotropic metabolism; genetic
polymorphisms in this enzyme lead to variations in drug response among poor and ultra-
rapid metabolizers.
4. Clozapine requires frequent blood monitoring primarily to screen for which life-threatening
condition?
A. Thrombocytopenia
, B. Hepatotoxicity
C. Nephrotoxicity
D. Agranulocytosis
Answer: D
Conceptual Explanation: Clozapine is associated with a 1% risk of agranulocytosis,
requiring strict Absolute Neutrophil Count (ANC) monitoring via the REMS program.
5. What is the mechanism of action of Varenicline in the treatment of nicotine dependence?
A. Full agonist at Alpha-7 nicotinic receptors
B. Antagonist at NMDA receptors
C. Partial agonist at Alpha-4 Beta-2 nicotinic receptors
D. Inhibitor of dopamine reuptake
Answer: C
Conceptual Explanation: Varenicline acts as a partial agonist at alpha-4 beta-2 nicotinic
acetylcholine receptors, reducing cravings while blocking the reinforcing effects of nicotine.
6. Which antidepressant is uniquely known for its Alpha-2 antagonism, resulting in increased
release of norepinephrine and serotonin?
A. Bupropion
B. Mirtazapine
