NU 150 / NU150 Pharmacology Exam 2 Practice Test
Actual 2025/2026 with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
SECTION 1: Pharmacokinetics & Pharmacodynamics (Questions
1–12)
Q1: A nurse is administering a medication that is highly protein-bound. The nurse
understands that if the patient has low albumin levels, the risk of toxicity increases
because:
A. More free (unbound) drug is available to exert pharmacological effects
B. The drug is metabolized more quickly
C. The drug is excreted more rapidly
D. Protein binding increases drug absorption
Correct Answer: A
Rationale: Highly protein-bound drugs exist in equilibrium between bound (inactive)
and free (active) forms; low albumin reduces binding sites, increasing the
concentration of free drug available to bind receptors and potentially causing
toxicity.
Q2: A drug has a half-life of 6 hours. Approximately how long will it take to reach
steady-state concentration with repeated dosing?
A. 6 hours
,B. 12 hours
C. 24–30 hours (4–5 half-lives)
D. 60 hours
Correct Answer: C
Rationale: Steady-state concentration is achieved after approximately 4–5 half-lives,
when the rate of drug administration equals the rate of elimination; for a drug with a
6-hour half-life, this occurs in 24–30 hours.
Q3: The therapeutic index of a drug is defined as:
A. The dose that produces the desired effect
B. The ratio of the toxic dose to the effective dose (TD₅₀/ED₅₀), with a higher index
indicating greater safety
C. The time it takes for the drug to be absorbed
D. The potency of the drug compared to a placebo
Correct Answer: B
Rationale: The therapeutic index is the ratio of the toxic dose to the effective dose
(TD₅₀/ED₅₀); a higher therapeutic index indicates a wider margin of safety between
therapeutic and toxic doses, while a narrow therapeutic index requires careful
monitoring.
Q4: A patient is taking a medication that undergoes first-pass metabolism in the liver.
The nurse understands that this means:
A. The drug is completely destroyed before reaching systemic circulation
, B. A significant portion of the drug is metabolized by the liver before entering
systemic circulation, reducing bioavailability
C. The drug bypasses the liver entirely
D. First-pass metabolism increases drug absorption
Correct Answer: B
Rationale: First-pass metabolism occurs when a drug absorbed from the GI tract
travels via the portal vein to the liver, where a significant portion is metabolized
before reaching systemic circulation; this reduces oral bioavailability compared to
parenteral routes.
Q5: A drug that acts as an agonist at a receptor:
A. Blocks the receptor and prevents endogenous ligand binding
B. Binds to the receptor and produces a biological response similar to the
endogenous ligand
C. Has no effect on the receptor
D. Destroys the receptor
Correct Answer: B
Rationale: An agonist binds to a receptor and activates it, producing a biological
response similar to the endogenous ligand; the magnitude of response depends on
affinity (binding strength) and intrinsic activity (ability to activate the receptor).
Q6: A nurse is reviewing a drug's pharmacokinetic profile. The process by which a
drug is converted from active to inactive forms, primarily in the liver, is called:
A. Absorption
Actual 2025/2026 with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
SECTION 1: Pharmacokinetics & Pharmacodynamics (Questions
1–12)
Q1: A nurse is administering a medication that is highly protein-bound. The nurse
understands that if the patient has low albumin levels, the risk of toxicity increases
because:
A. More free (unbound) drug is available to exert pharmacological effects
B. The drug is metabolized more quickly
C. The drug is excreted more rapidly
D. Protein binding increases drug absorption
Correct Answer: A
Rationale: Highly protein-bound drugs exist in equilibrium between bound (inactive)
and free (active) forms; low albumin reduces binding sites, increasing the
concentration of free drug available to bind receptors and potentially causing
toxicity.
Q2: A drug has a half-life of 6 hours. Approximately how long will it take to reach
steady-state concentration with repeated dosing?
A. 6 hours
,B. 12 hours
C. 24–30 hours (4–5 half-lives)
D. 60 hours
Correct Answer: C
Rationale: Steady-state concentration is achieved after approximately 4–5 half-lives,
when the rate of drug administration equals the rate of elimination; for a drug with a
6-hour half-life, this occurs in 24–30 hours.
Q3: The therapeutic index of a drug is defined as:
A. The dose that produces the desired effect
B. The ratio of the toxic dose to the effective dose (TD₅₀/ED₅₀), with a higher index
indicating greater safety
C. The time it takes for the drug to be absorbed
D. The potency of the drug compared to a placebo
Correct Answer: B
Rationale: The therapeutic index is the ratio of the toxic dose to the effective dose
(TD₅₀/ED₅₀); a higher therapeutic index indicates a wider margin of safety between
therapeutic and toxic doses, while a narrow therapeutic index requires careful
monitoring.
Q4: A patient is taking a medication that undergoes first-pass metabolism in the liver.
The nurse understands that this means:
A. The drug is completely destroyed before reaching systemic circulation
, B. A significant portion of the drug is metabolized by the liver before entering
systemic circulation, reducing bioavailability
C. The drug bypasses the liver entirely
D. First-pass metabolism increases drug absorption
Correct Answer: B
Rationale: First-pass metabolism occurs when a drug absorbed from the GI tract
travels via the portal vein to the liver, where a significant portion is metabolized
before reaching systemic circulation; this reduces oral bioavailability compared to
parenteral routes.
Q5: A drug that acts as an agonist at a receptor:
A. Blocks the receptor and prevents endogenous ligand binding
B. Binds to the receptor and produces a biological response similar to the
endogenous ligand
C. Has no effect on the receptor
D. Destroys the receptor
Correct Answer: B
Rationale: An agonist binds to a receptor and activates it, producing a biological
response similar to the endogenous ligand; the magnitude of response depends on
affinity (binding strength) and intrinsic activity (ability to activate the receptor).
Q6: A nurse is reviewing a drug's pharmacokinetic profile. The process by which a
drug is converted from active to inactive forms, primarily in the liver, is called:
A. Absorption
