Lehne’s Pharmacotherapeutics 3rd
Edition Test Bank: 300 Practice Questions
with Answers and Rationales
1
Which pharmacokinetic process describes movement of a drug from the site of administration
into the systemic circulation?
A. Distribution
B. Metabolism
C. Absorption
D. Excretion
Answer: C. Absorption
Rationale: Absorption is the movement of a drug from its administration site into the systemic
circulation.
2.
Which organ is primarily responsible for hepatic drug metabolism?
A. Kidney
B. Liver
C. Heart
D. Spleen
Answer: B. Liver
Rationale: The liver contains numerous enzymes, particularly the cytochrome P450 system,
responsible for metabolism of many medications.
3.
A drug with a high first-pass effect will generally have which characteristic?
A. Increased oral bioavailability
B. Reduced oral bioavailability
,C. Increased renal excretion
D. Prolonged absorption
Answer: B. Reduced oral bioavailability
Rationale: Extensive metabolism in the intestinal wall and liver before systemic circulation
reduces the amount of orally administered drug reaching the circulation.
4.
Which route provides 100% bioavailability?
A. Oral
B. Subcutaneous
C. Intramuscular
D. Intravenous
Answer: D. Intravenous
Rationale: Intravenous administration places the drug directly into systemic circulation,
giving essentially complete bioavailability.
5.
What is the primary purpose of a loading dose?
A. Prevent drug metabolism
B. Reach therapeutic concentrations rapidly
C. Increase renal clearance
D. Reduce drug absorption
Answer: B. Reach therapeutic concentrations rapidly
Rationale: A loading dose is used when rapid attainment of a therapeutic drug concentration
is desired.
6.
Which term describes the amount of drug eliminated per unit of time?
A. Clearance
B. Potency
C. Affinity
D. Bioavailability
Answer: A. Clearance
,Rationale: Clearance represents the volume of plasma from which a drug is completely
removed per unit of time.
7.
A medication's half-life refers to the time required for:
A. Complete elimination
B. Absorption to begin
C. Plasma concentration to decrease by 50%
D. Peak effect to occur
Answer: C. Plasma concentration to decrease by 50%
Rationale: Half-life is the time required for the drug concentration in plasma to fall by one-
half.
8.
Which patient factor can significantly reduce renal drug clearance?
A. Increased muscle mass
B. Renal impairment
C. Increased appetite
D. Mild dehydration only
Answer: B. Renal impairment
Rationale: Reduced kidney function can decrease elimination of drugs that depend primarily
on renal excretion.
9.
A drug that binds strongly to plasma proteins is generally characterized by:
A. A large free-drug fraction
B. Less protein binding
C. A smaller free-drug fraction
D. Complete renal elimination
Answer: C. A smaller free-drug fraction
Rationale: Only unbound drug is generally available to cross membranes and exert
pharmacologic effects.
10.
, Which pharmacodynamic concept describes the maximum effect a drug can produce?
A. Potency
B. Efficacy
C. Clearance
D. Bioavailability
Answer: B. Efficacy
Rationale: Efficacy refers to the maximum therapeutic effect a drug can produce.
11.
A drug that binds to a receptor and produces a response is a:
A. Competitive inhibitor
B. Agonist
C. Antagonist
D. Enzyme inducer
Answer: B. Agonist
Rationale: An agonist binds to a receptor and activates it to produce a pharmacologic
response.
12.
A competitive antagonist generally:
A. Activates the receptor
B. Permanently destroys the receptor
C. Competes with an agonist for receptor binding
D. Increases agonist efficacy
Answer: C. Competes with an agonist for receptor binding
Rationale: Competitive antagonists compete reversibly with agonists at receptor sites and can
reduce the agonist response.
13.
Which adverse drug reaction is predictable from the known pharmacologic effects of a
medication?
A. Type A reaction
B. Type B reaction
Edition Test Bank: 300 Practice Questions
with Answers and Rationales
1
Which pharmacokinetic process describes movement of a drug from the site of administration
into the systemic circulation?
A. Distribution
B. Metabolism
C. Absorption
D. Excretion
Answer: C. Absorption
Rationale: Absorption is the movement of a drug from its administration site into the systemic
circulation.
2.
Which organ is primarily responsible for hepatic drug metabolism?
A. Kidney
B. Liver
C. Heart
D. Spleen
Answer: B. Liver
Rationale: The liver contains numerous enzymes, particularly the cytochrome P450 system,
responsible for metabolism of many medications.
3.
A drug with a high first-pass effect will generally have which characteristic?
A. Increased oral bioavailability
B. Reduced oral bioavailability
,C. Increased renal excretion
D. Prolonged absorption
Answer: B. Reduced oral bioavailability
Rationale: Extensive metabolism in the intestinal wall and liver before systemic circulation
reduces the amount of orally administered drug reaching the circulation.
4.
Which route provides 100% bioavailability?
A. Oral
B. Subcutaneous
C. Intramuscular
D. Intravenous
Answer: D. Intravenous
Rationale: Intravenous administration places the drug directly into systemic circulation,
giving essentially complete bioavailability.
5.
What is the primary purpose of a loading dose?
A. Prevent drug metabolism
B. Reach therapeutic concentrations rapidly
C. Increase renal clearance
D. Reduce drug absorption
Answer: B. Reach therapeutic concentrations rapidly
Rationale: A loading dose is used when rapid attainment of a therapeutic drug concentration
is desired.
6.
Which term describes the amount of drug eliminated per unit of time?
A. Clearance
B. Potency
C. Affinity
D. Bioavailability
Answer: A. Clearance
,Rationale: Clearance represents the volume of plasma from which a drug is completely
removed per unit of time.
7.
A medication's half-life refers to the time required for:
A. Complete elimination
B. Absorption to begin
C. Plasma concentration to decrease by 50%
D. Peak effect to occur
Answer: C. Plasma concentration to decrease by 50%
Rationale: Half-life is the time required for the drug concentration in plasma to fall by one-
half.
8.
Which patient factor can significantly reduce renal drug clearance?
A. Increased muscle mass
B. Renal impairment
C. Increased appetite
D. Mild dehydration only
Answer: B. Renal impairment
Rationale: Reduced kidney function can decrease elimination of drugs that depend primarily
on renal excretion.
9.
A drug that binds strongly to plasma proteins is generally characterized by:
A. A large free-drug fraction
B. Less protein binding
C. A smaller free-drug fraction
D. Complete renal elimination
Answer: C. A smaller free-drug fraction
Rationale: Only unbound drug is generally available to cross membranes and exert
pharmacologic effects.
10.
, Which pharmacodynamic concept describes the maximum effect a drug can produce?
A. Potency
B. Efficacy
C. Clearance
D. Bioavailability
Answer: B. Efficacy
Rationale: Efficacy refers to the maximum therapeutic effect a drug can produce.
11.
A drug that binds to a receptor and produces a response is a:
A. Competitive inhibitor
B. Agonist
C. Antagonist
D. Enzyme inducer
Answer: B. Agonist
Rationale: An agonist binds to a receptor and activates it to produce a pharmacologic
response.
12.
A competitive antagonist generally:
A. Activates the receptor
B. Permanently destroys the receptor
C. Competes with an agonist for receptor binding
D. Increases agonist efficacy
Answer: C. Competes with an agonist for receptor binding
Rationale: Competitive antagonists compete reversibly with agonists at receptor sites and can
reduce the agonist response.
13.
Which adverse drug reaction is predictable from the known pharmacologic effects of a
medication?
A. Type A reaction
B. Type B reaction
