NUR 6011/NUR6011 Exam 1 V1 | Advance
Pharmacology Q&A with Rationale |
William Paterson University
1. A patient is prescribed a drug that is known to have a high first-pass effect. Which route of
administration would most likely result in the highest bioavailability?
A. Oral
B. Nasogastric tube
C. Rectal
D. Sublingual
Correct Answer: D
Expert Explanation: The first-pass effect occurs when a drug is metabolized by the liver
before it reaches the systemic circulation. Sublingual administration allows the drug to
bypass the portal vein and enter the systemic circulation directly through the oral mucosa.
This results in higher bioavailability compared to oral or nasogastric routes which must
pass through the digestive system and liver first.
2. Which of the following describes the ‘Half-life’ of a medication accurately?
A. The time it takes for half of the drug to be absorbed into the blood.
B. The amount of time required for the concentration of the drug in the body to be reduced
by 50%.
,C. The time it takes for the drug to reach its maximum therapeutic effect.
D. The duration of time the drug remains at a steady-state concentration.
Correct Answer: B
Expert Explanation: Half-life is a pharmacokinetic parameter that indicates how quickly a
drug is eliminated from the plasma. It is defined as the time necessary for the total amount
of drug in the body to decrease by half. Understanding half-life is critical for determining
dosing intervals and the time required to reach steady state.
3. When a drug is an inhibitor of the Cytochrome P450 enzyme system, what is the expected
effect on a co-administered substrate drug?
A. The substrate drug will be excreted more rapidly.
B. The substrate drug will become less potent.
C. The substrate drug’s metabolism will be decreased, increasing the risk of toxicity.
D. The substrate drug’s absorption in the GI tract will be inhibited.
Correct Answer: C
Expert Explanation: Enzyme inhibitors slow down the metabolic breakdown of other
drugs that use the same pathway. This results in higher-than-expected serum levels of the
substrate drug, which can lead to adverse effects or toxicity. Clinicians must monitor for
these interactions when adding or removing medications from a patient’s regimen.
, 4. Which statement regarding protein binding is true?
A. Only the free, unbound portion of a drug is pharmacologically active.
B. Highly protein-bound drugs are easily filtered by the kidneys.
C. Low albumin levels lead to a decrease in the amount of free drug.
D. Drugs that are bound to albumin can easily cross the blood-brain barrier.
Correct Answer: A
Expert Explanation: Drugs in the bloodstream exist in a balance between being bound to
plasma proteins and being free. The bound portion acts as a reservoir and is inactive
because it cannot cross cell membranes. Only the ‘free’ drug is able to interact with
receptors and exert a therapeutic effect.
5. A drug with a narrow therapeutic index (TI) requires which of the following actions by the
healthcare provider?
A. Prescribing the drug only once daily to avoid accumulation.
B. Administering the drug only via the intravenous route.
C. Close monitoring of serum drug levels and signs of toxicity.
D. Assuming the drug is safe for all patient populations.
Correct Answer: C
Expert Explanation: A narrow therapeutic index means that the margin between a
therapeutic dose and a toxic dose is very small. Small changes in drug concentration can
Pharmacology Q&A with Rationale |
William Paterson University
1. A patient is prescribed a drug that is known to have a high first-pass effect. Which route of
administration would most likely result in the highest bioavailability?
A. Oral
B. Nasogastric tube
C. Rectal
D. Sublingual
Correct Answer: D
Expert Explanation: The first-pass effect occurs when a drug is metabolized by the liver
before it reaches the systemic circulation. Sublingual administration allows the drug to
bypass the portal vein and enter the systemic circulation directly through the oral mucosa.
This results in higher bioavailability compared to oral or nasogastric routes which must
pass through the digestive system and liver first.
2. Which of the following describes the ‘Half-life’ of a medication accurately?
A. The time it takes for half of the drug to be absorbed into the blood.
B. The amount of time required for the concentration of the drug in the body to be reduced
by 50%.
,C. The time it takes for the drug to reach its maximum therapeutic effect.
D. The duration of time the drug remains at a steady-state concentration.
Correct Answer: B
Expert Explanation: Half-life is a pharmacokinetic parameter that indicates how quickly a
drug is eliminated from the plasma. It is defined as the time necessary for the total amount
of drug in the body to decrease by half. Understanding half-life is critical for determining
dosing intervals and the time required to reach steady state.
3. When a drug is an inhibitor of the Cytochrome P450 enzyme system, what is the expected
effect on a co-administered substrate drug?
A. The substrate drug will be excreted more rapidly.
B. The substrate drug will become less potent.
C. The substrate drug’s metabolism will be decreased, increasing the risk of toxicity.
D. The substrate drug’s absorption in the GI tract will be inhibited.
Correct Answer: C
Expert Explanation: Enzyme inhibitors slow down the metabolic breakdown of other
drugs that use the same pathway. This results in higher-than-expected serum levels of the
substrate drug, which can lead to adverse effects or toxicity. Clinicians must monitor for
these interactions when adding or removing medications from a patient’s regimen.
, 4. Which statement regarding protein binding is true?
A. Only the free, unbound portion of a drug is pharmacologically active.
B. Highly protein-bound drugs are easily filtered by the kidneys.
C. Low albumin levels lead to a decrease in the amount of free drug.
D. Drugs that are bound to albumin can easily cross the blood-brain barrier.
Correct Answer: A
Expert Explanation: Drugs in the bloodstream exist in a balance between being bound to
plasma proteins and being free. The bound portion acts as a reservoir and is inactive
because it cannot cross cell membranes. Only the ‘free’ drug is able to interact with
receptors and exert a therapeutic effect.
5. A drug with a narrow therapeutic index (TI) requires which of the following actions by the
healthcare provider?
A. Prescribing the drug only once daily to avoid accumulation.
B. Administering the drug only via the intravenous route.
C. Close monitoring of serum drug levels and signs of toxicity.
D. Assuming the drug is safe for all patient populations.
Correct Answer: C
Expert Explanation: A narrow therapeutic index means that the margin between a
therapeutic dose and a toxic dose is very small. Small changes in drug concentration can
