PRN 1381/PRN1381 Exam 1 V2 | Principles
of Pharmacology Q&A with Rationale |
Rasmussen University
1. A nurse is administering an oral medication that undergoes a high first-pass effect. Which
of the following statements best describes this phenomenon?
A. The drug is rapidly excreted by the kidneys before reaching the tissues.
B. The drug is absorbed slowly due to the presence of food in the stomach.
C. The drug is metabolized by the liver before it reaches the systemic circulation.
D. The drug has a high affinity for protein binding in the bloodstream.
Correct Answer: C
Expert Explanation: The first-pass effect occurs when a medication is extensively
metabolized by the liver after being absorbed from the gastrointestinal tract. This process
significantly reduces the amount of active drug that reaches the systemic circulation.
Consequently, drugs with a high first-pass effect often require higher oral doses or
alternative routes of administration.
2. Which pharmacokinetic phase is most affected by a patient having chronic renal failure?
A. Absorption
B. Distribution
C. Metabolism
,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. Chronic renal failure impairs the
ability of the kidneys to filter and eliminate these substances efficiently. This can lead to
drug accumulation and potential toxicity if dosages are not adjusted.
3. A nurse is reviewing a drug with a narrow therapeutic index. What does this term indicate
to the nurse?
A. The drug is safe to administer without frequent monitoring.
B. The drug is only effective for a very small number of medical conditions.
C. The difference between the effective dose and the toxic dose is very small.
D. The drug remains in the body for a very short period of time.
Correct Answer: C
Expert Explanation: A narrow therapeutic index means that the margin of safety between
a therapeutic dose and a toxic dose is slim. Patients taking these medications require close
monitoring of blood levels to ensure they stay within the safe range. Examples of such
drugs include digoxin and lithium.
4. Which of the following describes a drug that binds to a receptor and produces a maximal
biological response?
A. Agonist
, B. Antagonist
C. Partial Agonist
D. Inhibitor
Correct Answer: A
Expert Explanation: An agonist is a chemical that binds to a receptor and activates it to
produce a biological response. It mimics the action of endogenous substances like
hormones or neurotransmitters. This differs from an antagonist, which binds to the
receptor but blocks a response from occurring.
5. When assessing an elderly patient’s medication regimen, the nurse notes the patient is
taking 12 different medications. This is known as:
A. Drug Tolerance
B. Synergistic Effect
C. Drug Potentiation
D. Polypharmacy
Correct Answer: D
Expert Explanation: Polypharmacy refers to the use of multiple medications by a single
patient, which is common among the elderly population. This practice increases the risk of
drug-drug interactions and adverse drug reactions. It is essential for nurses to perform
regular medication reconciliations to minimize unnecessary drug use.
of Pharmacology Q&A with Rationale |
Rasmussen University
1. A nurse is administering an oral medication that undergoes a high first-pass effect. Which
of the following statements best describes this phenomenon?
A. The drug is rapidly excreted by the kidneys before reaching the tissues.
B. The drug is absorbed slowly due to the presence of food in the stomach.
C. The drug is metabolized by the liver before it reaches the systemic circulation.
D. The drug has a high affinity for protein binding in the bloodstream.
Correct Answer: C
Expert Explanation: The first-pass effect occurs when a medication is extensively
metabolized by the liver after being absorbed from the gastrointestinal tract. This process
significantly reduces the amount of active drug that reaches the systemic circulation.
Consequently, drugs with a high first-pass effect often require higher oral doses or
alternative routes of administration.
2. Which pharmacokinetic phase is most affected by a patient having chronic renal failure?
A. Absorption
B. Distribution
C. Metabolism
,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. Chronic renal failure impairs the
ability of the kidneys to filter and eliminate these substances efficiently. This can lead to
drug accumulation and potential toxicity if dosages are not adjusted.
3. A nurse is reviewing a drug with a narrow therapeutic index. What does this term indicate
to the nurse?
A. The drug is safe to administer without frequent monitoring.
B. The drug is only effective for a very small number of medical conditions.
C. The difference between the effective dose and the toxic dose is very small.
D. The drug remains in the body for a very short period of time.
Correct Answer: C
Expert Explanation: A narrow therapeutic index means that the margin of safety between
a therapeutic dose and a toxic dose is slim. Patients taking these medications require close
monitoring of blood levels to ensure they stay within the safe range. Examples of such
drugs include digoxin and lithium.
4. Which of the following describes a drug that binds to a receptor and produces a maximal
biological response?
A. Agonist
, B. Antagonist
C. Partial Agonist
D. Inhibitor
Correct Answer: A
Expert Explanation: An agonist is a chemical that binds to a receptor and activates it to
produce a biological response. It mimics the action of endogenous substances like
hormones or neurotransmitters. This differs from an antagonist, which binds to the
receptor but blocks a response from occurring.
5. When assessing an elderly patient’s medication regimen, the nurse notes the patient is
taking 12 different medications. This is known as:
A. Drug Tolerance
B. Synergistic Effect
C. Drug Potentiation
D. Polypharmacy
Correct Answer: D
Expert Explanation: Polypharmacy refers to the use of multiple medications by a single
patient, which is common among the elderly population. This practice increases the risk of
drug-drug interactions and adverse drug reactions. It is essential for nurses to perform
regular medication reconciliations to minimize unnecessary drug use.
