D441 Pharmacology Final Exam Practice 2026 |WGU
1. Which organ is primarily responsible for the metabolism of most drugs?
A. Kidneys
B. Liver
C. Lungs
D. Small Intestine
Answer: B
Rationale: The liver is the primary site for drug metabolism via the cytochrome P450
enzyme system.
2. What is the term for the time required for the concentration of a drug in the
body to decrease by 50%?
A. Peak concentration
B. Duration of action
C. Half-life
D. Bioavailability
Answer: C
Rationale: Half-life is the time it takes for the blood level of a drug to reduce by half.
3. Which route of administration is affected by the first-pass effect?
A. Intravenous
B. Oral
C. Sublingual
D. Subcutaneous
Answer: B
,Rationale: Orally administered drugs are absorbed from the GI tract and pass through the
liver before reaching systemic circulation.
4. A drug that binds to a receptor and produces a maximal biological response is
called a(n):
A. Antagonist
B. Inverse agonist
C. Partial agonist
D. Agonist
Answer: D
Rationale: An agonist mimics the action of endogenous substances to produce a response.
5. Which lab value should be monitored most closely for a patient taking
Warfarin?
A. aPTT
B. PT/INR
C. Creatinine
D. White blood cell count
Answer: B
Rationale: Warfarin therapy is monitored using Prothrombin Time (PT) and International
Normalized Ratio (INR).
6. What is the antidote for Heparin overdose?
A. Vitamin K
B. Flumazenil
C. Acetylcysteine
D. Protamine sulfate
Answer: D
, Rationale: Protamine sulfate binds to heparin to form a stable salt, neutralizing its
anticoagulant effect.
7. Which side effect is most uniquely associated with ACE inhibitors like
Lisinopril?
A. Peripheral edema
B. Constipation
C. Dry, non-productive cough
D. Tachycardia
Answer: C
Rationale: The accumulation of bradykinin caused by ACE inhibitors often leads to a
persistent dry cough.
8. What is the therapeutic range for Digoxin?
A. 5 to 12 mcg/mL
B. 0.5 to 2.0 ng/mL
C. 10 to 20 mcg/mL
D. 0.1 to 0.5 ng/mL
Answer: B
Rationale: The standard therapeutic range for Digoxin is 0.5 to 2.0 ng/mL; levels above
this indicate toxicity.
9. Which medication is considered a ‘rescue’ inhaler for acute asthma attacks?
A. Salmeterol
B. Albuterol
C. Fluticasone
D. Tiotropium
Answer: B
Rationale: Albuterol is a short-acting beta-2 agonist (SABA) used for immediate
bronchodilation.
1. Which organ is primarily responsible for the metabolism of most drugs?
A. Kidneys
B. Liver
C. Lungs
D. Small Intestine
Answer: B
Rationale: The liver is the primary site for drug metabolism via the cytochrome P450
enzyme system.
2. What is the term for the time required for the concentration of a drug in the
body to decrease by 50%?
A. Peak concentration
B. Duration of action
C. Half-life
D. Bioavailability
Answer: C
Rationale: Half-life is the time it takes for the blood level of a drug to reduce by half.
3. Which route of administration is affected by the first-pass effect?
A. Intravenous
B. Oral
C. Sublingual
D. Subcutaneous
Answer: B
,Rationale: Orally administered drugs are absorbed from the GI tract and pass through the
liver before reaching systemic circulation.
4. A drug that binds to a receptor and produces a maximal biological response is
called a(n):
A. Antagonist
B. Inverse agonist
C. Partial agonist
D. Agonist
Answer: D
Rationale: An agonist mimics the action of endogenous substances to produce a response.
5. Which lab value should be monitored most closely for a patient taking
Warfarin?
A. aPTT
B. PT/INR
C. Creatinine
D. White blood cell count
Answer: B
Rationale: Warfarin therapy is monitored using Prothrombin Time (PT) and International
Normalized Ratio (INR).
6. What is the antidote for Heparin overdose?
A. Vitamin K
B. Flumazenil
C. Acetylcysteine
D. Protamine sulfate
Answer: D
, Rationale: Protamine sulfate binds to heparin to form a stable salt, neutralizing its
anticoagulant effect.
7. Which side effect is most uniquely associated with ACE inhibitors like
Lisinopril?
A. Peripheral edema
B. Constipation
C. Dry, non-productive cough
D. Tachycardia
Answer: C
Rationale: The accumulation of bradykinin caused by ACE inhibitors often leads to a
persistent dry cough.
8. What is the therapeutic range for Digoxin?
A. 5 to 12 mcg/mL
B. 0.5 to 2.0 ng/mL
C. 10 to 20 mcg/mL
D. 0.1 to 0.5 ng/mL
Answer: B
Rationale: The standard therapeutic range for Digoxin is 0.5 to 2.0 ng/mL; levels above
this indicate toxicity.
9. Which medication is considered a ‘rescue’ inhaler for acute asthma attacks?
A. Salmeterol
B. Albuterol
C. Fluticasone
D. Tiotropium
Answer: B
Rationale: Albuterol is a short-acting beta-2 agonist (SABA) used for immediate
bronchodilation.
