NU150 | NU150 Pharmacology Exam 1 v1 |
Questions with Correct Answers and Expert
Explanation for Each Question | Galen
1. Which phase of pharmacokinetics is most significantly affected by a patient having
chronic liver disease?
A. Absorption
B. Excretion
C. Metabolism
D. Distribution
Correct Answer: C
Expert Explanation: Metabolism is the biochemical alteration of a drug into an
inactive metabolite or a more soluble compound. The liver is the primary organ
responsible for this process through the action of cytochrome P450 enzymes.
Patients with liver disease may experience impaired drug metabolism leading to
increased toxicity risks.
2. A nurse is reviewing the ‘Rights of Medication Administration.’ Which right is being
exercised when the nurse asks the patient for their date of birth?
A. Right Documentation
B. Right Route
,C. Right Dose
D. Right Patient
Correct Answer: D
Expert Explanation: The right patient is verified by using at least two unique
identifiers before administering any medication. Common identifiers include the
patient’s full name, date of birth, or medical record number. This safety check is
critical to prevent medication errors involving the wrong individual.
3. What is the term for the time it takes for one-half of the original amount of a drug
to be removed from the body?
A. Half-life
B. Peak effect
C. Onset of action
D. Duration of action
Correct Answer: A
Expert Explanation: Half-life is a measure of the rate at which a drug is removed
from the body. It determines the dosing interval and how long it takes for a drug to
reach a steady state. Most drugs are considered effectively eliminated after
approximately five half-lives.
,4. A drug that binds to a receptor and prevents a biological response is known as:
A. Agonist
B. Additive
C. Synergist
D. Antagonist
Correct Answer: D
Expert Explanation: An antagonist is a drug that binds to a receptor but does not
elicit a response. Instead, it blocks the receptor, preventing other substances like
agonists from binding and causing an effect. This competitive or non-competitive
inhibition is a key mechanism of many therapeutic agents.
5. The nurse is administering a medication with a very narrow therapeutic index. What
should the nurse prioritize?
A. Administer the drug with food to prevent nausea
B. Monitor serum drug levels closely
C. Educate the patient on the cost of the drug
D. Assess the patient’s heart rate only
Correct Answer: B
, Expert Explanation: A narrow therapeutic index means that the difference
between a therapeutic dose and a toxic dose is very small. Drugs in this category
require frequent blood level monitoring to ensure safety and efficacy. Examples of
such drugs include digoxin, lithium, and warfarin.
6. When administering an oral medication, the nurse understands that the ‘first-pass
effect’ refers to:
A. Excretion of the drug by the kidneys
B. Binding of the drug to plasma proteins
C. The time it takes for the drug to reach the stomach
D. Metabolism of the drug by the liver before reaching systemic circulation
Correct Answer: D
Expert Explanation: The first-pass effect occurs when drugs taken orally are
absorbed in the GI tract and carried directly to the liver via the portal vein. The liver
metabolizes a portion of the drug before it ever reaches the general circulation. This
process reduces the bioavailability of many oral medications compared to IV forms.
7. A patient is being treated for an overdose. The nurse knows that an ‘antidote’
performs which function?
A. Increases the drug’s absorption
B. Potentiates the drug’s effect
Questions with Correct Answers and Expert
Explanation for Each Question | Galen
1. Which phase of pharmacokinetics is most significantly affected by a patient having
chronic liver disease?
A. Absorption
B. Excretion
C. Metabolism
D. Distribution
Correct Answer: C
Expert Explanation: Metabolism is the biochemical alteration of a drug into an
inactive metabolite or a more soluble compound. The liver is the primary organ
responsible for this process through the action of cytochrome P450 enzymes.
Patients with liver disease may experience impaired drug metabolism leading to
increased toxicity risks.
2. A nurse is reviewing the ‘Rights of Medication Administration.’ Which right is being
exercised when the nurse asks the patient for their date of birth?
A. Right Documentation
B. Right Route
,C. Right Dose
D. Right Patient
Correct Answer: D
Expert Explanation: The right patient is verified by using at least two unique
identifiers before administering any medication. Common identifiers include the
patient’s full name, date of birth, or medical record number. This safety check is
critical to prevent medication errors involving the wrong individual.
3. What is the term for the time it takes for one-half of the original amount of a drug
to be removed from the body?
A. Half-life
B. Peak effect
C. Onset of action
D. Duration of action
Correct Answer: A
Expert Explanation: Half-life is a measure of the rate at which a drug is removed
from the body. It determines the dosing interval and how long it takes for a drug to
reach a steady state. Most drugs are considered effectively eliminated after
approximately five half-lives.
,4. A drug that binds to a receptor and prevents a biological response is known as:
A. Agonist
B. Additive
C. Synergist
D. Antagonist
Correct Answer: D
Expert Explanation: An antagonist is a drug that binds to a receptor but does not
elicit a response. Instead, it blocks the receptor, preventing other substances like
agonists from binding and causing an effect. This competitive or non-competitive
inhibition is a key mechanism of many therapeutic agents.
5. The nurse is administering a medication with a very narrow therapeutic index. What
should the nurse prioritize?
A. Administer the drug with food to prevent nausea
B. Monitor serum drug levels closely
C. Educate the patient on the cost of the drug
D. Assess the patient’s heart rate only
Correct Answer: B
, Expert Explanation: A narrow therapeutic index means that the difference
between a therapeutic dose and a toxic dose is very small. Drugs in this category
require frequent blood level monitoring to ensure safety and efficacy. Examples of
such drugs include digoxin, lithium, and warfarin.
6. When administering an oral medication, the nurse understands that the ‘first-pass
effect’ refers to:
A. Excretion of the drug by the kidneys
B. Binding of the drug to plasma proteins
C. The time it takes for the drug to reach the stomach
D. Metabolism of the drug by the liver before reaching systemic circulation
Correct Answer: D
Expert Explanation: The first-pass effect occurs when drugs taken orally are
absorbed in the GI tract and carried directly to the liver via the portal vein. The liver
metabolizes a portion of the drug before it ever reaches the general circulation. This
process reduces the bioavailability of many oral medications compared to IV forms.
7. A patient is being treated for an overdose. The nurse knows that an ‘antidote’
performs which function?
A. Increases the drug’s absorption
B. Potentiates the drug’s effect
