WGU D116 ADVANCED
PHARMACOLOGY OA & ACTUAL
EXAM QUESTIONS AND ANSWERS |
100% VERIFIED– PASS GUARANTEED –
A+ GRADED 2026/2027
1. A patient taking Warfarin is prescribed Rifampin for tuberculosis. What is the expected
pharmacokinetic interaction?
A. Rifampin induces CYP450 enzymes, decreasing Warfarin levels.
B. Rifampin inhibits CYP450 enzymes, increasing Warfarin levels.
C. Rifampin competes for protein binding sites, increasing free Warfarin.
D. Rifampin decreases the renal excretion of Warfarin.
Answer: A
Conceptual Explanation: Rifampin is a potent inducer of the CYP450 system (specifically
2C9 and 3A4), which speeds up the metabolism of Warfarin, necessitating an increased
dose of the anticoagulant.
,2. Which electrolyte abnormality significantly increases the risk of Digoxin toxicity?
A. Hyperkalemia
B. Hyponatremia
C. Hypokalemia
D. Hypermagnesemia
Answer: C
Conceptual Explanation: Digoxin competes with potassium for the Na+/K+ ATPase pump.
Low potassium levels allow more Digoxin to bind, leading to toxicity.
3. What is the primary mechanism of action of Metformin in managing Type 2 Diabetes?
A. Inhibiting hepatic glucose production and improving insulin sensitivity.
B. Stimulating insulin secretion from pancreatic beta cells.
C. Slowing the absorption of carbohydrates in the GI tract.
D. Increasing glucose excretion via the kidneys.
Answer: A
Conceptual Explanation: Metformin reduces gluconeogenesis in the liver and enhances
peripheral glucose uptake, unlike sulfonylureas which stimulate insulin release.
4. In a patient with bilateral renal artery stenosis, why are ACE inhibitors contraindicated?
A. They cause profound vasodilation of the afferent arteriole.
, B. They lead to excessive sodium retention.
C. They block Angiotensin II-mediated vasoconstriction of the efferent arteriole, reducing
GFR.
D. They stimulate the release of aldosterone.
Answer: C
Conceptual Explanation: In renal artery stenosis, GFR is maintained by Angiotensin II-
induced constriction of the efferent arteriole. Blocking this with an ACE inhibitor can cause
acute renal failure.
5. Which drug class is known for the risk of tendon rupture, particularly in elderly patients or
those taking glucocorticoids?
A. Tetracyclines
B. Fluoroquinolones
C. Macrolides
D. Aminoglycosides
Answer: B
Conceptual Explanation: Fluoroquinolones, such as Ciprofloxacin and Levofloxacin, carry
a black box warning for tendonitis and tendon rupture.
PHARMACOLOGY OA & ACTUAL
EXAM QUESTIONS AND ANSWERS |
100% VERIFIED– PASS GUARANTEED –
A+ GRADED 2026/2027
1. A patient taking Warfarin is prescribed Rifampin for tuberculosis. What is the expected
pharmacokinetic interaction?
A. Rifampin induces CYP450 enzymes, decreasing Warfarin levels.
B. Rifampin inhibits CYP450 enzymes, increasing Warfarin levels.
C. Rifampin competes for protein binding sites, increasing free Warfarin.
D. Rifampin decreases the renal excretion of Warfarin.
Answer: A
Conceptual Explanation: Rifampin is a potent inducer of the CYP450 system (specifically
2C9 and 3A4), which speeds up the metabolism of Warfarin, necessitating an increased
dose of the anticoagulant.
,2. Which electrolyte abnormality significantly increases the risk of Digoxin toxicity?
A. Hyperkalemia
B. Hyponatremia
C. Hypokalemia
D. Hypermagnesemia
Answer: C
Conceptual Explanation: Digoxin competes with potassium for the Na+/K+ ATPase pump.
Low potassium levels allow more Digoxin to bind, leading to toxicity.
3. What is the primary mechanism of action of Metformin in managing Type 2 Diabetes?
A. Inhibiting hepatic glucose production and improving insulin sensitivity.
B. Stimulating insulin secretion from pancreatic beta cells.
C. Slowing the absorption of carbohydrates in the GI tract.
D. Increasing glucose excretion via the kidneys.
Answer: A
Conceptual Explanation: Metformin reduces gluconeogenesis in the liver and enhances
peripheral glucose uptake, unlike sulfonylureas which stimulate insulin release.
4. In a patient with bilateral renal artery stenosis, why are ACE inhibitors contraindicated?
A. They cause profound vasodilation of the afferent arteriole.
, B. They lead to excessive sodium retention.
C. They block Angiotensin II-mediated vasoconstriction of the efferent arteriole, reducing
GFR.
D. They stimulate the release of aldosterone.
Answer: C
Conceptual Explanation: In renal artery stenosis, GFR is maintained by Angiotensin II-
induced constriction of the efferent arteriole. Blocking this with an ACE inhibitor can cause
acute renal failure.
5. Which drug class is known for the risk of tendon rupture, particularly in elderly patients or
those taking glucocorticoids?
A. Tetracyclines
B. Fluoroquinolones
C. Macrolides
D. Aminoglycosides
Answer: B
Conceptual Explanation: Fluoroquinolones, such as Ciprofloxacin and Levofloxacin, carry
a black box warning for tendonitis and tendon rupture.
