ADVANCED PHARMACOLOGY FINAL
EXAM OBJECTIVE ASSESSMENT
QUESTIONS AND ANSWERS
1. A patient with a history of heart failure is prescribed Digoxin. Which electrolyte imbalance
significantly increases the risk of digoxin toxicity?
A. Hypokalemia
B. Hyperkalemia
C. Hypernatremia
D. Hypocalcemia
Answer: A
Conceptual Explanation: Hypokalemia increases the sensitivity of the cardiac muscle to
digoxin because digoxin competes with potassium for the Na+/K+ ATPase pump.
2. Which mechanism best describes the action of Labetalol in treating hypertensive
emergencies?
A. Selective Beta-1 blockade
B. Direct vasodilation via nitric oxide release
,C. Non-selective Beta blockade and Alpha-1 blockade
D. Calcium channel blockade in smooth muscle
Answer: C
Conceptual Explanation: Labetalol is unique as it blocks Alpha-1 receptors (vasodilation)
and Beta-1/Beta-2 receptors (reducing heart rate/contractility).
3. A patient is starting Warfarin therapy. Which of the following cytochrome P450 (CYP)
interactions would most likely lead to an increased INR and bleeding risk?
A. Concurrent use of a CYP2C9 inhibitor like Amiodarone
B. Concurrent use of a CYP2C9 inducer like Rifampin
C. Excessive intake of Vitamin K-rich leafy greens
D. Chronic use of St. John’s Wort
Answer: A
Conceptual Explanation: Amiodarone inhibits the CYP2C9 enzyme responsible for
metabolizing S-warfarin, leading to higher drug levels and increased bleeding risk.
4. In the treatment of Parkinson’s Disease, why is Carbidopa administered alongside
Levodopa?
A. To cross the blood-brain barrier and convert to dopamine
B. To block dopamine reuptake in the synaptic cleft
C. To inhibit peripheral decarboxylation of levodopa
, D. To act as a direct dopamine receptor agonist
Answer: C
Conceptual Explanation: Carbidopa inhibits the enzyme dopa-decarboxylase in the
periphery, preventing the premature conversion of levodopa to dopamine outside the
brain.
5. Which antidepressant class is most likely to cause hypertensive crisis if consumed with
tyramine-rich foods?
A. MAOIs
B. SNRIs
C. SSRIs
D. TCAs
Answer: A
Conceptual Explanation: Monoamine Oxidase Inhibitors (MAOIs) prevent the breakdown
of tyramine, which causes massive release of norepinephrine, leading to severe
vasoconstriction.
6. A patient diagnosed with Type 2 Diabetes is prescribed Exenatide. What is the primary
mechanism of action for this GLP-1 receptor agonist?
A. Directly stimulates the PPAR-gamma receptor in adipose tissue
B. Blocks the SGLT2 transporter in the kidneys to increase glucose excretion
EXAM OBJECTIVE ASSESSMENT
QUESTIONS AND ANSWERS
1. A patient with a history of heart failure is prescribed Digoxin. Which electrolyte imbalance
significantly increases the risk of digoxin toxicity?
A. Hypokalemia
B. Hyperkalemia
C. Hypernatremia
D. Hypocalcemia
Answer: A
Conceptual Explanation: Hypokalemia increases the sensitivity of the cardiac muscle to
digoxin because digoxin competes with potassium for the Na+/K+ ATPase pump.
2. Which mechanism best describes the action of Labetalol in treating hypertensive
emergencies?
A. Selective Beta-1 blockade
B. Direct vasodilation via nitric oxide release
,C. Non-selective Beta blockade and Alpha-1 blockade
D. Calcium channel blockade in smooth muscle
Answer: C
Conceptual Explanation: Labetalol is unique as it blocks Alpha-1 receptors (vasodilation)
and Beta-1/Beta-2 receptors (reducing heart rate/contractility).
3. A patient is starting Warfarin therapy. Which of the following cytochrome P450 (CYP)
interactions would most likely lead to an increased INR and bleeding risk?
A. Concurrent use of a CYP2C9 inhibitor like Amiodarone
B. Concurrent use of a CYP2C9 inducer like Rifampin
C. Excessive intake of Vitamin K-rich leafy greens
D. Chronic use of St. John’s Wort
Answer: A
Conceptual Explanation: Amiodarone inhibits the CYP2C9 enzyme responsible for
metabolizing S-warfarin, leading to higher drug levels and increased bleeding risk.
4. In the treatment of Parkinson’s Disease, why is Carbidopa administered alongside
Levodopa?
A. To cross the blood-brain barrier and convert to dopamine
B. To block dopamine reuptake in the synaptic cleft
C. To inhibit peripheral decarboxylation of levodopa
, D. To act as a direct dopamine receptor agonist
Answer: C
Conceptual Explanation: Carbidopa inhibits the enzyme dopa-decarboxylase in the
periphery, preventing the premature conversion of levodopa to dopamine outside the
brain.
5. Which antidepressant class is most likely to cause hypertensive crisis if consumed with
tyramine-rich foods?
A. MAOIs
B. SNRIs
C. SSRIs
D. TCAs
Answer: A
Conceptual Explanation: Monoamine Oxidase Inhibitors (MAOIs) prevent the breakdown
of tyramine, which causes massive release of norepinephrine, leading to severe
vasoconstriction.
6. A patient diagnosed with Type 2 Diabetes is prescribed Exenatide. What is the primary
mechanism of action for this GLP-1 receptor agonist?
A. Directly stimulates the PPAR-gamma receptor in adipose tissue
B. Blocks the SGLT2 transporter in the kidneys to increase glucose excretion
