PRN 1381/PRN1381 Exam 1 V3 | Principles
of Pharmacology Q&A with Rationale |
Rasmussen University
1. Which process of pharmacokinetics involves the movement of a drug from its site of
administration into the bloodstream?
A. Absorption
B. Metabolism
C. Distribution
D. Excretion
Correct Answer: A
Expert Explanation: Absorption is the primary phase where the drug moves from the
entry site into the systemic circulation. This process determines how quickly and how
much of the drug becomes available for use. Factors such as route of administration and
lipid solubility significantly impact the rate of absorption.
2. A patient is receiving an oral medication that undergoes significant first-pass metabolism.
What does the nurse understand about this drug?
A. The drug is metabolized by the liver before reaching systemic circulation.
B. The drug will have 100% bioavailability.
C. The drug will be absorbed faster in the stomach.
,D. The drug will bypass the liver via the portal vein.
Correct Answer: A
Expert Explanation: The first-pass effect occurs when a drug is taken orally and absorbed
from the GI tract into the portal circulation. It is then transported to the liver where a large
portion of the drug may be metabolized before it reaches the rest of the body. This
phenomenon explains why oral doses are often much higher than intravenous doses for the
same medication.
3. Which organ is primarily responsible for the metabolism of most pharmacological agents?
A. Kidneys
B. Lungs
C. Liver
D. Small Intestine
Correct Answer: C
Expert Explanation: The liver is the central site for biotransformation where enzymes
break down drugs into metabolites. This process typically makes the drug more water-
soluble so it can be excreted by the kidneys. If a patient has liver disease, the metabolism of
drugs may be slowed, leading to potential toxicity.
4. The nurse is caring for a patient with chronic renal failure. What pharmacokinetic phase is
most likely to be impaired?
A. Metabolism
, B. Absorption
C. Distribution
D. Excretion
Correct Answer: D
Expert Explanation: Excretion is the process by which drugs and their metabolites are
removed from the body, primarily through the kidneys. In patients with renal failure, drugs
can accumulate in the system because the kidneys cannot filter them out effectively.
Monitoring lab values like serum creatinine and BUN is essential to ensure safe dosing in
these patients.
5. A drug has a half-life of 4 hours. If a dose of 100 mg is given, how much drug will remain in
the body after 8 hours?
A. 50 mg
B. 25 mg
C. 12.5 mg
D. 0 mg
Correct Answer: B
Expert Explanation: Half-life is the time required for the concentration of a drug in the
body to decrease by 50%. After 4 hours (one half-life), 50 mg remains; after another 4
of Pharmacology Q&A with Rationale |
Rasmussen University
1. Which process of pharmacokinetics involves the movement of a drug from its site of
administration into the bloodstream?
A. Absorption
B. Metabolism
C. Distribution
D. Excretion
Correct Answer: A
Expert Explanation: Absorption is the primary phase where the drug moves from the
entry site into the systemic circulation. This process determines how quickly and how
much of the drug becomes available for use. Factors such as route of administration and
lipid solubility significantly impact the rate of absorption.
2. A patient is receiving an oral medication that undergoes significant first-pass metabolism.
What does the nurse understand about this drug?
A. The drug is metabolized by the liver before reaching systemic circulation.
B. The drug will have 100% bioavailability.
C. The drug will be absorbed faster in the stomach.
,D. The drug will bypass the liver via the portal vein.
Correct Answer: A
Expert Explanation: The first-pass effect occurs when a drug is taken orally and absorbed
from the GI tract into the portal circulation. It is then transported to the liver where a large
portion of the drug may be metabolized before it reaches the rest of the body. This
phenomenon explains why oral doses are often much higher than intravenous doses for the
same medication.
3. Which organ is primarily responsible for the metabolism of most pharmacological agents?
A. Kidneys
B. Lungs
C. Liver
D. Small Intestine
Correct Answer: C
Expert Explanation: The liver is the central site for biotransformation where enzymes
break down drugs into metabolites. This process typically makes the drug more water-
soluble so it can be excreted by the kidneys. If a patient has liver disease, the metabolism of
drugs may be slowed, leading to potential toxicity.
4. The nurse is caring for a patient with chronic renal failure. What pharmacokinetic phase is
most likely to be impaired?
A. Metabolism
, B. Absorption
C. Distribution
D. Excretion
Correct Answer: D
Expert Explanation: Excretion is the process by which drugs and their metabolites are
removed from the body, primarily through the kidneys. In patients with renal failure, drugs
can accumulate in the system because the kidneys cannot filter them out effectively.
Monitoring lab values like serum creatinine and BUN is essential to ensure safe dosing in
these patients.
5. A drug has a half-life of 4 hours. If a dose of 100 mg is given, how much drug will remain in
the body after 8 hours?
A. 50 mg
B. 25 mg
C. 12.5 mg
D. 0 mg
Correct Answer: B
Expert Explanation: Half-life is the time required for the concentration of a drug in the
body to decrease by 50%. After 4 hours (one half-life), 50 mg remains; after another 4
