NR 508 Advanced Pharmacology Final Exam Chamberlain
University | 75 Multiple-Choice Questions With Verified
Answers & Rationales | 2026/2027
Question 1.
A drug with a long half-life of 24 hours is typically administered:
A. Once daily
B. Every 4 hours
C. Every 6 hours
D. Every 2 hours
Correct Answer: A
Rationale:
A drug with a half-life of 24 hours can usually be given once daily because therapeutic
concentrations are maintained for an extended period. Half-life influences dosing intervals and
time to steady state. Short half-life drugs require more frequent dosing to maintain therapeutic
levels .
Question 2.
Steady state is generally achieved after how many half-lives?
A. 1 to 2
B. 4 to 5
C. 8 to 10
D. 15 to 20
Correct Answer: B
Rationale:
Steady state occurs when drug intake equals drug elimination. It is generally achieved after
approximately four to five half-lives with regular dosing. This principle helps clinicians
determine when to assess full therapeutic effect or steady-state drug concentration .
,Question 3.
Hypoalbuminemia is clinically important in prescribing because it may cause which effect?
A. Decreased drug excretion
B. Increased metabolism of all drugs
C. Increased free drug concentration and altered distribution
D. Reduced absorption of intravenous drugs
Correct Answer: C
Rationale:
Albumin binds many drugs. Low albumin reduces protein binding, increasing free drug
concentration and potentially enhancing effect or toxicity. This is especially important for highly
protein-bound drugs with narrow therapeutic ranges .
Question 4.
The cytochrome P450 enzyme system is responsible for which process?
A. Drug excretion
B. Protein binding
C. Drug metabolism
D. Receptor activation
Correct Answer: C
Rationale:
The cytochrome P450 system is the major enzyme system responsible for Phase I drug
metabolism (oxidation, reduction, hydrolysis) in the liver. It converts lipid-soluble drugs into
more water-soluble compounds for excretion .
Question 5.
A drug with a narrow therapeutic index:
A. Has a wide margin of safety
B. Requires therapeutic drug monitoring
C. Is always given intravenously
D. Cannot be used in elderly patients
, Correct Answer: B
Rationale:
Drugs with a narrow therapeutic index (e.g., warfarin, phenytoin, lithium, digoxin) have a small
margin of safety between therapeutic and toxic doses. They require therapeutic drug
monitoring to maintain levels within the therapeutic range and prevent toxicity .
Question 6.
The "first-pass effect" refers to:
A. Excretion of a drug in the urine
B. Metabolism of a drug in the liver before it reaches systemic circulation
C. Distribution of a drug to fatty tissues
D. Binding of a drug to plasma proteins
Correct Answer: B
Rationale:
The first-pass effect occurs when orally administered drugs are absorbed from the GI tract and
transported via the portal vein to the liver, where they may be extensively metabolized before
reaching systemic circulation. This reduces bioavailability of oral drugs .
Question 7.
Bioavailability refers to:
A. The time it takes for a drug to reach peak concentration
B. The percentage of an administered drug that reaches systemic circulation unchanged
C. The volume of distribution of a drug
D. The rate of drug elimination
Correct Answer: B
Rationale:
Bioavailability (F) is the fraction of an administered dose that reaches systemic circulation
unchanged. IV drugs have 100% bioavailability (F=1). Oral drugs have lower bioavailability due
to first-pass metabolism .
University | 75 Multiple-Choice Questions With Verified
Answers & Rationales | 2026/2027
Question 1.
A drug with a long half-life of 24 hours is typically administered:
A. Once daily
B. Every 4 hours
C. Every 6 hours
D. Every 2 hours
Correct Answer: A
Rationale:
A drug with a half-life of 24 hours can usually be given once daily because therapeutic
concentrations are maintained for an extended period. Half-life influences dosing intervals and
time to steady state. Short half-life drugs require more frequent dosing to maintain therapeutic
levels .
Question 2.
Steady state is generally achieved after how many half-lives?
A. 1 to 2
B. 4 to 5
C. 8 to 10
D. 15 to 20
Correct Answer: B
Rationale:
Steady state occurs when drug intake equals drug elimination. It is generally achieved after
approximately four to five half-lives with regular dosing. This principle helps clinicians
determine when to assess full therapeutic effect or steady-state drug concentration .
,Question 3.
Hypoalbuminemia is clinically important in prescribing because it may cause which effect?
A. Decreased drug excretion
B. Increased metabolism of all drugs
C. Increased free drug concentration and altered distribution
D. Reduced absorption of intravenous drugs
Correct Answer: C
Rationale:
Albumin binds many drugs. Low albumin reduces protein binding, increasing free drug
concentration and potentially enhancing effect or toxicity. This is especially important for highly
protein-bound drugs with narrow therapeutic ranges .
Question 4.
The cytochrome P450 enzyme system is responsible for which process?
A. Drug excretion
B. Protein binding
C. Drug metabolism
D. Receptor activation
Correct Answer: C
Rationale:
The cytochrome P450 system is the major enzyme system responsible for Phase I drug
metabolism (oxidation, reduction, hydrolysis) in the liver. It converts lipid-soluble drugs into
more water-soluble compounds for excretion .
Question 5.
A drug with a narrow therapeutic index:
A. Has a wide margin of safety
B. Requires therapeutic drug monitoring
C. Is always given intravenously
D. Cannot be used in elderly patients
, Correct Answer: B
Rationale:
Drugs with a narrow therapeutic index (e.g., warfarin, phenytoin, lithium, digoxin) have a small
margin of safety between therapeutic and toxic doses. They require therapeutic drug
monitoring to maintain levels within the therapeutic range and prevent toxicity .
Question 6.
The "first-pass effect" refers to:
A. Excretion of a drug in the urine
B. Metabolism of a drug in the liver before it reaches systemic circulation
C. Distribution of a drug to fatty tissues
D. Binding of a drug to plasma proteins
Correct Answer: B
Rationale:
The first-pass effect occurs when orally administered drugs are absorbed from the GI tract and
transported via the portal vein to the liver, where they may be extensively metabolized before
reaching systemic circulation. This reduces bioavailability of oral drugs .
Question 7.
Bioavailability refers to:
A. The time it takes for a drug to reach peak concentration
B. The percentage of an administered drug that reaches systemic circulation unchanged
C. The volume of distribution of a drug
D. The rate of drug elimination
Correct Answer: B
Rationale:
Bioavailability (F) is the fraction of an administered dose that reaches systemic circulation
unchanged. IV drugs have 100% bioavailability (F=1). Oral drugs have lower bioavailability due
to first-pass metabolism .
