D441 Pharmacology Week 1 Study Guide 2026 |WGU
1. Which phase of pharmacokinetics is most significantly affected by the ‘first-
pass effect’?
A. Excretion
B. Distribution
C. Absorption
D. Metabolism
Answer: D
Rationale: The first-pass effect refers to the rapid metabolism of a drug by the liver before
it reaches the systemic circulation, primarily affecting oral medications.
2. Which term describes the percentage of an administered drug dose that
reaches the systemic circulation?
A. Half-life
B. Protein Binding
C. Potency
D. Bioavailability
Answer: D
Rationale: Bioavailability is the fraction of an unchanged drug that reaches the systemic
circulation after administration.
,3. A drug with a high affinity for albumin will result in which of the following?
A. Increased excretion rates
B. Decreased duration of action
C. A higher concentration of free drug
D. Lower levels of free, active drug
Answer: D
Rationale: Drugs that are highly protein-bound (to albumin) remain in the bloodstream in
an inactive state; only the ‘free’ drug is pharmacologically active.
4. What is the primary site for drug metabolism in the human body?
A. Kidneys
B. Small Intestine
C. Liver
D. Lungs
Answer: C
Rationale: The liver is the primary organ responsible for drug metabolism, utilizing
enzymes like the Cytochrome P450 system.
5. A patient is prescribed a drug with a half-life of 4 hours. How long will it take
for approximately 94% of the drug to be eliminated?
A. 8 hours
B. 12 hours
C. 24 hours
D. 16 hours
Answer: D
Rationale: It takes approximately four half-lives to eliminate 93.75% (roughly 94%) of a
drug. 4 hours x 4 = 16 hours.
, 6. Which category of drugs is defined as having a high potential for abuse and
no currently accepted medical use in the United States?
A. Schedule V
B. Schedule II
C. Schedule III
D. Schedule I
Answer: D
Rationale: Schedule I drugs (e.g., heroin, LSD) have a high abuse potential and no accepted
medical use.
7. An ‘agonist’ is a drug that:
A. Blocks a receptor to prevent a response
B. Binds to a receptor and triggers a biological response
C. Accelerates the excretion of other drugs
D. Only works when the patient is fasting
Answer: B
Rationale: An agonist mimics the action of endogenous substances by binding to and
activating receptors.
8. Which route of administration provides the fastest onset of action?
A. Intravenous (IV)
B. Subcutaneous (SQ)
C. Oral (PO)
D. Transdermal
Answer: A
Rationale: Intravenous administration places the drug directly into the bloodstream,
bypassing absorption barriers and providing immediate onset.
1. Which phase of pharmacokinetics is most significantly affected by the ‘first-
pass effect’?
A. Excretion
B. Distribution
C. Absorption
D. Metabolism
Answer: D
Rationale: The first-pass effect refers to the rapid metabolism of a drug by the liver before
it reaches the systemic circulation, primarily affecting oral medications.
2. Which term describes the percentage of an administered drug dose that
reaches the systemic circulation?
A. Half-life
B. Protein Binding
C. Potency
D. Bioavailability
Answer: D
Rationale: Bioavailability is the fraction of an unchanged drug that reaches the systemic
circulation after administration.
,3. A drug with a high affinity for albumin will result in which of the following?
A. Increased excretion rates
B. Decreased duration of action
C. A higher concentration of free drug
D. Lower levels of free, active drug
Answer: D
Rationale: Drugs that are highly protein-bound (to albumin) remain in the bloodstream in
an inactive state; only the ‘free’ drug is pharmacologically active.
4. What is the primary site for drug metabolism in the human body?
A. Kidneys
B. Small Intestine
C. Liver
D. Lungs
Answer: C
Rationale: The liver is the primary organ responsible for drug metabolism, utilizing
enzymes like the Cytochrome P450 system.
5. A patient is prescribed a drug with a half-life of 4 hours. How long will it take
for approximately 94% of the drug to be eliminated?
A. 8 hours
B. 12 hours
C. 24 hours
D. 16 hours
Answer: D
Rationale: It takes approximately four half-lives to eliminate 93.75% (roughly 94%) of a
drug. 4 hours x 4 = 16 hours.
, 6. Which category of drugs is defined as having a high potential for abuse and
no currently accepted medical use in the United States?
A. Schedule V
B. Schedule II
C. Schedule III
D. Schedule I
Answer: D
Rationale: Schedule I drugs (e.g., heroin, LSD) have a high abuse potential and no accepted
medical use.
7. An ‘agonist’ is a drug that:
A. Blocks a receptor to prevent a response
B. Binds to a receptor and triggers a biological response
C. Accelerates the excretion of other drugs
D. Only works when the patient is fasting
Answer: B
Rationale: An agonist mimics the action of endogenous substances by binding to and
activating receptors.
8. Which route of administration provides the fastest onset of action?
A. Intravenous (IV)
B. Subcutaneous (SQ)
C. Oral (PO)
D. Transdermal
Answer: A
Rationale: Intravenous administration places the drug directly into the bloodstream,
bypassing absorption barriers and providing immediate onset.
