D441 Pharmacology Exam 1 Practice Questions 2026 |WGU
1. Which process describes the movement of a drug from its site of
administration into the bloodstream?
A. Distribution
B. Metabolism
C. Absorption
D. Excretion
Answer: C
Rationale: Absorption is the movement of a drug from the site of administration to the
blood. Distribution is movement from blood to tissues, metabolism is enzymatic alteration,
and excretion is removal from the body.
2. A drug that binds to a receptor and produces a maximal biological response is
known as a(n):
A. Antagonist
B. Agonist
C. Partial agonist
D. Inhibitor
Answer: B
Rationale: Agonists are molecules that activate receptors. Antagonists prevent receptor
activation, while partial agonists produce only moderate intrinsic activity.
,3. Which organ is primarily responsible for the metabolism of most drugs?
A. Liver
B. Lungs
C. Kidneys
D. Small Intestine
Answer: A
Rationale: The liver is the primary site of drug metabolism, utilizing the cytochrome P450
enzyme system to chemically alter drugs.
4. The ‘First-Pass Effect’ most significantly impacts drugs administered via which
route?
A. Intravenous (IV)
B. Sublingual
C. Oral (PO)
D. Intramuscular (IM)
Answer: C
Rationale: Oral drugs are absorbed in the GI tract and carried to the liver via the hepatic
portal vein, where they may be extensively metabolized before reaching systemic
circulation.
5. If a drug has a half-life of 4 hours and a dose of 100mg is given, how much
drug remains in the body after 8 hours?
A. 25mg
B. 50mg
C. 12.5mg
D. 0mg
Answer: A
Rationale: After one half-life (4 hours), 50mg remains. After two half-lives (8 hours), half
of that 50mg remains, which is 25mg.
, 6. Which term refers to the ratio between a drug’s lethal dose and its effective
dose, indicating safety?
A. Therapeutic Index
B. Bioavailability
C. Potency
D. Efficacy
Answer: A
Rationale: The therapeutic index (TI) is a measure of a drug’s safety. A narrow TI means
the difference between a therapeutic dose and a toxic dose is small.
7. What is the primary protein in the blood that drugs bind to, potentially
affecting distribution?
A. Hemoglobin
B. Fibrinogen
C. Albumin
D. Globulin
Answer: C
Rationale: Albumin is the most abundant protein in plasma. Drugs bound to albumin are
inactive; only ‘free’ drug can leave the capillaries to exert an effect.
8. A patient is prescribed a drug that is a known enzyme inducer. What effect
will this have on other drugs metabolized by the same enzyme?
A. Decreased drug levels and reduced therapeutic effect
B. Increased drug levels and risk of toxicity
C. No change in drug levels
D. Immediate excretion of the drug
Answer: A
Rationale: Enzyme inducers speed up metabolism, leading to faster breakdown of other
drugs, which decreases their plasma levels and effectiveness.
1. Which process describes the movement of a drug from its site of
administration into the bloodstream?
A. Distribution
B. Metabolism
C. Absorption
D. Excretion
Answer: C
Rationale: Absorption is the movement of a drug from the site of administration to the
blood. Distribution is movement from blood to tissues, metabolism is enzymatic alteration,
and excretion is removal from the body.
2. A drug that binds to a receptor and produces a maximal biological response is
known as a(n):
A. Antagonist
B. Agonist
C. Partial agonist
D. Inhibitor
Answer: B
Rationale: Agonists are molecules that activate receptors. Antagonists prevent receptor
activation, while partial agonists produce only moderate intrinsic activity.
,3. Which organ is primarily responsible for the metabolism of most drugs?
A. Liver
B. Lungs
C. Kidneys
D. Small Intestine
Answer: A
Rationale: The liver is the primary site of drug metabolism, utilizing the cytochrome P450
enzyme system to chemically alter drugs.
4. The ‘First-Pass Effect’ most significantly impacts drugs administered via which
route?
A. Intravenous (IV)
B. Sublingual
C. Oral (PO)
D. Intramuscular (IM)
Answer: C
Rationale: Oral drugs are absorbed in the GI tract and carried to the liver via the hepatic
portal vein, where they may be extensively metabolized before reaching systemic
circulation.
5. If a drug has a half-life of 4 hours and a dose of 100mg is given, how much
drug remains in the body after 8 hours?
A. 25mg
B. 50mg
C. 12.5mg
D. 0mg
Answer: A
Rationale: After one half-life (4 hours), 50mg remains. After two half-lives (8 hours), half
of that 50mg remains, which is 25mg.
, 6. Which term refers to the ratio between a drug’s lethal dose and its effective
dose, indicating safety?
A. Therapeutic Index
B. Bioavailability
C. Potency
D. Efficacy
Answer: A
Rationale: The therapeutic index (TI) is a measure of a drug’s safety. A narrow TI means
the difference between a therapeutic dose and a toxic dose is small.
7. What is the primary protein in the blood that drugs bind to, potentially
affecting distribution?
A. Hemoglobin
B. Fibrinogen
C. Albumin
D. Globulin
Answer: C
Rationale: Albumin is the most abundant protein in plasma. Drugs bound to albumin are
inactive; only ‘free’ drug can leave the capillaries to exert an effect.
8. A patient is prescribed a drug that is a known enzyme inducer. What effect
will this have on other drugs metabolized by the same enzyme?
A. Decreased drug levels and reduced therapeutic effect
B. Increased drug levels and risk of toxicity
C. No change in drug levels
D. Immediate excretion of the drug
Answer: A
Rationale: Enzyme inducers speed up metabolism, leading to faster breakdown of other
drugs, which decreases their plasma levels and effectiveness.
