N180 | N180 Exam 1: Pharmacology - WCU
Updated and Latest Questions and Correct
Answers with Rationale
1. Which pharmacokinetic process is primarily affected by a patient’s liver function?
A. Absorption
B. Distribution
C. Excretion
D. Metabolism
Correct Answer: D
Rationale: Metabolism is the biochemical transformation of a drug into an inactive
metabolite or a more soluble compound. The liver is the primary organ responsible for this
process through enzymatic reactions. When liver function is impaired, drug levels can rise
to toxic concentrations because the body cannot break them down. Nurses must monitor
liver enzymes like ALT and AST to ensure safe dosing. This phase is distinct from excretion,
which primarily involves the kidneys.
2. A patient is prescribed a medication that acts as an agonist. How does this drug work in the
body?
A. It blocks a receptor to prevent a response.
B. It accelerates the excretion of other drugs.
C. It binds to a receptor and triggers a biological response.
D. It permanently deactivates cellular enzymes.
Correct Answer: C
Rationale: An agonist is a drug that binds to a receptor and produces a functional response
similar to endogenous substances. This mimicry allows the medication to activate cellular
pathways effectively. In contrast, an antagonist would bind to the receptor simply to block
other substances from attaching. Understanding receptor activity is a fundamental concept
in pharmacodynamics. Agonists are often used to supplement or replace natural hormones
and neurotransmitters.
3. A drug has a half-life of 4 hours. If a patient takes 200 mg at 12:00 PM, how much drug will
remain in the system at 8:00 PM?
A. 100 mg
B. 50 mg
C. 75 mg
,D. 25 mg
Correct Answer: B
Rationale: The half-life of a drug is the time required for the concentration to decrease by
50 percent. From 12:00 PM to 8:00 PM is a total of 8 hours, representing two half-lives.
After the first 4 hours, the 200 mg dose is reduced to 100 mg. After the second 4 hours, the
100 mg is reduced by half again to 50 mg. Calculating half-lives is essential for determining
steady-state concentrations and dosing intervals.
4. Which route of administration provides 100% bioavailability?
A. Oral (PO)
B. Intravenous (IV)
C. Subcutaneous (SubQ)
D. Intramuscular (IM)
Correct Answer: B
Rationale: Bioavailability refers to the proportion of a drug that enters the systemic
circulation and is able to have an active effect. Intravenous administration bypasses all
absorption barriers and the first-pass effect of the liver. Because the drug is injected
directly into the bloodstream, the entire dose is immediately available. Other routes like
oral or intramuscular require absorption, which can be inconsistent or incomplete. This
makes the IV route the most predictable for emergency clinical situations.
5. The nurse is reviewing a patient’s labs and notes a significantly low serum albumin level.
What is the pharmacological concern?
A. There will be a higher level of free, active drug in the blood.
B. The drug will be absorbed more slowly.
C. The drug will be excreted faster by the kidneys.
D. The drug will not be able to cross the blood-brain barrier.
Correct Answer: A
Rationale: Many drugs bind to plasma proteins, primarily albumin, while circulating in the
bloodstream. Only the ‘free’ or unbound portion of the drug is pharmacologically active and
able to produce a therapeutic effect. When albumin levels are low, there are fewer binding
sites available for the medication. This leads to an increase in free drug concentration,
which significantly raises the risk of toxicity. Nurses must monitor patients with
malnutrition or liver disease closely for these adverse effects.
6. What is the primary purpose of a ‘loading dose’?
A. To reduce the risk of drug-drug interactions.
, B. To reach a therapeutic drug level in the body more rapidly.
C. To ensure the drug is metabolized as quickly as possible.
D. To prevent the patient from developing a drug tolerance.
Correct Answer: B
Rationale: A loading dose is a large initial dose given to achieve a therapeutic plasma
concentration quickly. This is common with medications that have a long half-life, which
would otherwise take days to reach steady state. Once the therapeutic level is achieved,
smaller maintenance doses are given to keep the drug at that level. This strategy is critical
in acute situations like treating severe infections or heart arrhythmias. Proper monitoring
is required to prevent immediate toxicity from the high initial amount.
7. Which of the following is considered one of the ‘6 Rights’ of medication administration?
A. Right Documentation
B. Right Physician
C. Right Room
D. Right Diagnosis
Correct Answer: A
Rationale: The 6 Rights are the standard safety checks performed to prevent medication
errors in clinical practice. They include Right Patient, Right Drug, Right Dose, Right Route,
Right Time, and Right Documentation. Right Documentation ensures that the
administration is recorded accurately to prevent double-dosing or omissions. While room
number and diagnosis are important, they are not part of the primary 6 safety checkpoints.
Adhering to these rights is a fundamental nursing responsibility for patient safety.
8. The nurse is preparing to administer an enteric-coated tablet. What is the correct action?
A. Administer the tablet whole and do not crush it.
B. Have the patient chew the tablet for faster absorption.
C. Dissolve the tablet in warm water before administration.
D. Crush the tablet and mix it with applesauce.
Correct Answer: A
Rationale: Enteric-coated tablets are designed to dissolve in the alkaline environment of
the small intestine rather than the acidic stomach. This coating protects the stomach lining
from irritation and prevents the drug from being destroyed by gastric acid. Crushing or
chewing the tablet destroys this specialized barrier and alters the pharmacokinetics of the
medication. This could lead to premature drug release and increased side effects or
Updated and Latest Questions and Correct
Answers with Rationale
1. Which pharmacokinetic process is primarily affected by a patient’s liver function?
A. Absorption
B. Distribution
C. Excretion
D. Metabolism
Correct Answer: D
Rationale: Metabolism is the biochemical transformation of a drug into an inactive
metabolite or a more soluble compound. The liver is the primary organ responsible for this
process through enzymatic reactions. When liver function is impaired, drug levels can rise
to toxic concentrations because the body cannot break them down. Nurses must monitor
liver enzymes like ALT and AST to ensure safe dosing. This phase is distinct from excretion,
which primarily involves the kidneys.
2. A patient is prescribed a medication that acts as an agonist. How does this drug work in the
body?
A. It blocks a receptor to prevent a response.
B. It accelerates the excretion of other drugs.
C. It binds to a receptor and triggers a biological response.
D. It permanently deactivates cellular enzymes.
Correct Answer: C
Rationale: An agonist is a drug that binds to a receptor and produces a functional response
similar to endogenous substances. This mimicry allows the medication to activate cellular
pathways effectively. In contrast, an antagonist would bind to the receptor simply to block
other substances from attaching. Understanding receptor activity is a fundamental concept
in pharmacodynamics. Agonists are often used to supplement or replace natural hormones
and neurotransmitters.
3. A drug has a half-life of 4 hours. If a patient takes 200 mg at 12:00 PM, how much drug will
remain in the system at 8:00 PM?
A. 100 mg
B. 50 mg
C. 75 mg
,D. 25 mg
Correct Answer: B
Rationale: The half-life of a drug is the time required for the concentration to decrease by
50 percent. From 12:00 PM to 8:00 PM is a total of 8 hours, representing two half-lives.
After the first 4 hours, the 200 mg dose is reduced to 100 mg. After the second 4 hours, the
100 mg is reduced by half again to 50 mg. Calculating half-lives is essential for determining
steady-state concentrations and dosing intervals.
4. Which route of administration provides 100% bioavailability?
A. Oral (PO)
B. Intravenous (IV)
C. Subcutaneous (SubQ)
D. Intramuscular (IM)
Correct Answer: B
Rationale: Bioavailability refers to the proportion of a drug that enters the systemic
circulation and is able to have an active effect. Intravenous administration bypasses all
absorption barriers and the first-pass effect of the liver. Because the drug is injected
directly into the bloodstream, the entire dose is immediately available. Other routes like
oral or intramuscular require absorption, which can be inconsistent or incomplete. This
makes the IV route the most predictable for emergency clinical situations.
5. The nurse is reviewing a patient’s labs and notes a significantly low serum albumin level.
What is the pharmacological concern?
A. There will be a higher level of free, active drug in the blood.
B. The drug will be absorbed more slowly.
C. The drug will be excreted faster by the kidneys.
D. The drug will not be able to cross the blood-brain barrier.
Correct Answer: A
Rationale: Many drugs bind to plasma proteins, primarily albumin, while circulating in the
bloodstream. Only the ‘free’ or unbound portion of the drug is pharmacologically active and
able to produce a therapeutic effect. When albumin levels are low, there are fewer binding
sites available for the medication. This leads to an increase in free drug concentration,
which significantly raises the risk of toxicity. Nurses must monitor patients with
malnutrition or liver disease closely for these adverse effects.
6. What is the primary purpose of a ‘loading dose’?
A. To reduce the risk of drug-drug interactions.
, B. To reach a therapeutic drug level in the body more rapidly.
C. To ensure the drug is metabolized as quickly as possible.
D. To prevent the patient from developing a drug tolerance.
Correct Answer: B
Rationale: A loading dose is a large initial dose given to achieve a therapeutic plasma
concentration quickly. This is common with medications that have a long half-life, which
would otherwise take days to reach steady state. Once the therapeutic level is achieved,
smaller maintenance doses are given to keep the drug at that level. This strategy is critical
in acute situations like treating severe infections or heart arrhythmias. Proper monitoring
is required to prevent immediate toxicity from the high initial amount.
7. Which of the following is considered one of the ‘6 Rights’ of medication administration?
A. Right Documentation
B. Right Physician
C. Right Room
D. Right Diagnosis
Correct Answer: A
Rationale: The 6 Rights are the standard safety checks performed to prevent medication
errors in clinical practice. They include Right Patient, Right Drug, Right Dose, Right Route,
Right Time, and Right Documentation. Right Documentation ensures that the
administration is recorded accurately to prevent double-dosing or omissions. While room
number and diagnosis are important, they are not part of the primary 6 safety checkpoints.
Adhering to these rights is a fundamental nursing responsibility for patient safety.
8. The nurse is preparing to administer an enteric-coated tablet. What is the correct action?
A. Administer the tablet whole and do not crush it.
B. Have the patient chew the tablet for faster absorption.
C. Dissolve the tablet in warm water before administration.
D. Crush the tablet and mix it with applesauce.
Correct Answer: A
Rationale: Enteric-coated tablets are designed to dissolve in the alkaline environment of
the small intestine rather than the acidic stomach. This coating protects the stomach lining
from irritation and prevents the drug from being destroyed by gastric acid. Crushing or
chewing the tablet destroys this specialized barrier and alters the pharmacokinetics of the
medication. This could lead to premature drug release and increased side effects or
