NURS 5334 Advanced Pharmacology Quiz 2 Test Bank
#### Section 1: Foundations of Advanced Pharmacology (Questions 1-20)
**1. A patient with a history of liver cirrhosis is prescribed a new medication that undergoes extensive first-pass
metabolism. Which route of administration would the nurse anticipate the prescriber to order to avoid this effect?**
A. Oral
B. Sublingual
C. Intravenous
D. Transdermal
**Answer: C. Intravenous**
**Rationale:** The first-pass effect is the metabolism of a drug by the liver before it reaches systemic circulation.
The IV route bypasses the liver completely, delivering the drug directly into systemic circulation. Sublingual and
transdermal routes also avoid the first-pass effect to a large extent, but IV is the definitive route to avoid it. The oral
route is subject to the most significant first-pass metabolism.
**2. A drug has a half-life of 4 hours. After 24 hours, approximately what percentage of the original drug remains in
the body?**
A. 12.5%
B. 6.25%
C. 3.125%
D. 1.56%
**Answer: D. 1.56%**
,**Rationale:** After 24 hours, 6 half-lives have passed (24 hours / 4 hours = 6 half-lives). The percentage remaining
is calculated as (1/2)^6 = 1/64 = 1.56%. This is a core concept for understanding drug accumulation and steady-state
concentrations.
**3. A patient's medication has a narrow therapeutic index. What is the most critical nursing action regarding this
medication?**
A. Monitor serum drug levels routinely.
B. Administer with food to minimize GI upset.
C. Instruct the patient to double the dose if a dose is missed.
D. Advise the patient to take the medication only when symptoms are severe.
**Answer: A. Monitor serum drug levels routinely.**
**Rationale:** A narrow therapeutic index means the difference between the therapeutic dose and the toxic dose
is small. Therefore, meticulous monitoring of serum drug levels is essential to ensure the patient is within the
therapeutic range and to prevent toxicity. Doubling doses or taking them as needed is dangerous.
**4. A patient is prescribed a drug that is a weak acid. Which of the following scenarios would the nurse expect to
see an increased renal excretion of the drug?**
A. Administering sodium bicarbonate to alkalinize the urine.
B. Administering ammonium chloride to acidify the urine.
C. The patient developing metabolic alkalosis.
D. The patient developing respiratory acidosis.
**Answer: B. Administering ammonium chloride to acidify the urine.**
**Rationale:** "Ion trapping" dictates that weak acids are more readily excreted in an alkaline environment because
they become ionized and cannot be reabsorbed. Conversely, a weak acid will be more readily reabsorbed (less
excreted) in an acidic environment. Therefore, acidifying the urine with ammonium chloride promotes the excretion
of a weak acid.
**5. A patient is on a drug that is highly protein-bound. Which of the following conditions would increase the risk of
drug toxicity?**
,A. Increased serum albumin levels.
B. Decreased serum albumin levels.
C. Administration of a drug with a lower protein-binding affinity.
D. Administration of the drug on an empty stomach.
**Answer: B. Decreased serum albumin levels.**
**Rationale:** If a drug is highly protein-bound, only the free (unbound) fraction is pharmacologically active. If
serum albumin is low, there are fewer binding sites, leading to a higher concentration of free drug. This increases
the risk of toxicity, as more of the drug is available to exert its effect.
**6. A patient is experiencing a severe anaphylactic reaction. Which medication would the nurse expect to be
administered first?**
A. Albuterol (bronchodilator)
B. Diphenhydramine (antihistamine)
C. Epinephrine
D. Methylprednisolone (corticosteroid)
**Answer: C. Epinephrine**
**Rationale:** Epinephrine is the first-line treatment for anaphylaxis. It is an alpha- and beta-adrenergic agonist
that rapidly reverses bronchospasm, hypotension, and laryngeal edema. While corticosteroids, antihistamines, and
bronchodilators are used in the management of anaphylaxis, they are considered adjunctive therapies and are not
the primary, immediate life-saving intervention.
**7. The nurse is caring for a patient who has developed a significant drug allergy. The nurse knows this is a type of
adverse effect that is:**
A. Dose-dependent and predictable.
B. Not dose-related and unpredictable.
C. A result of cumulative drug effects.
D. An exaggeration of the therapeutic effect.
, **Answer: B. Not dose-related and unpredictable.**
**Rationale:** Adverse drug reactions (ADRs) are classified as Type A (augmented, predictable, dose-dependent) or
Type B (bizarre, unpredictable, not dose-dependent). Drug allergies are a prime example of a Type B reaction, as
they are immune-mediated and are not related to the drug's pharmacology or dosage.
**8. A patient on a cardiac medication is prescribed a new drug that is a CYP3A4 inhibitor. The nurse should monitor
this patient for:**
A. Decreased effects of the cardiac medication.
B. Increased effects and toxicity of the cardiac medication.
C. No change in the therapeutic effect of the cardiac medication.
D. An anaphylactic reaction to the new drug.
**Answer: B. Increased effects and toxicity of the cardiac medication.**
**Rationale:** CYP450 enzymes, like CYP3A4, are responsible for metabolizing many drugs. If a drug inhibits CYP3A4,
it will decrease the metabolism of other drugs that are substrates of this enzyme. This leads to increased serum
concentrations of those substrates, potentially causing toxicity.
**9. A patient with renal failure is prescribed a drug that is primarily excreted by the kidneys. The nurse anticipates
that the prescriber will:**
A. Increase the dose to achieve a therapeutic effect.
B. Decrease the dose or increase the dosing interval.
C. Keep the dose the same and monitor for adverse effects.
D. Change the route of administration from oral to IV.
**Answer: B. Decrease the dose or increase the dosing interval.**
**Rationale:** In renal failure, drug clearance is reduced. To prevent drug accumulation and toxicity, the dose must
be reduced or the dosing interval must be increased. This is a fundamental principle of pharmacokinetics in patients
with organ dysfunction.
**10. Which phase of clinical drug trials involves a large, diverse patient population and is designed to confirm
efficacy and monitor for adverse effects?**
#### Section 1: Foundations of Advanced Pharmacology (Questions 1-20)
**1. A patient with a history of liver cirrhosis is prescribed a new medication that undergoes extensive first-pass
metabolism. Which route of administration would the nurse anticipate the prescriber to order to avoid this effect?**
A. Oral
B. Sublingual
C. Intravenous
D. Transdermal
**Answer: C. Intravenous**
**Rationale:** The first-pass effect is the metabolism of a drug by the liver before it reaches systemic circulation.
The IV route bypasses the liver completely, delivering the drug directly into systemic circulation. Sublingual and
transdermal routes also avoid the first-pass effect to a large extent, but IV is the definitive route to avoid it. The oral
route is subject to the most significant first-pass metabolism.
**2. A drug has a half-life of 4 hours. After 24 hours, approximately what percentage of the original drug remains in
the body?**
A. 12.5%
B. 6.25%
C. 3.125%
D. 1.56%
**Answer: D. 1.56%**
,**Rationale:** After 24 hours, 6 half-lives have passed (24 hours / 4 hours = 6 half-lives). The percentage remaining
is calculated as (1/2)^6 = 1/64 = 1.56%. This is a core concept for understanding drug accumulation and steady-state
concentrations.
**3. A patient's medication has a narrow therapeutic index. What is the most critical nursing action regarding this
medication?**
A. Monitor serum drug levels routinely.
B. Administer with food to minimize GI upset.
C. Instruct the patient to double the dose if a dose is missed.
D. Advise the patient to take the medication only when symptoms are severe.
**Answer: A. Monitor serum drug levels routinely.**
**Rationale:** A narrow therapeutic index means the difference between the therapeutic dose and the toxic dose
is small. Therefore, meticulous monitoring of serum drug levels is essential to ensure the patient is within the
therapeutic range and to prevent toxicity. Doubling doses or taking them as needed is dangerous.
**4. A patient is prescribed a drug that is a weak acid. Which of the following scenarios would the nurse expect to
see an increased renal excretion of the drug?**
A. Administering sodium bicarbonate to alkalinize the urine.
B. Administering ammonium chloride to acidify the urine.
C. The patient developing metabolic alkalosis.
D. The patient developing respiratory acidosis.
**Answer: B. Administering ammonium chloride to acidify the urine.**
**Rationale:** "Ion trapping" dictates that weak acids are more readily excreted in an alkaline environment because
they become ionized and cannot be reabsorbed. Conversely, a weak acid will be more readily reabsorbed (less
excreted) in an acidic environment. Therefore, acidifying the urine with ammonium chloride promotes the excretion
of a weak acid.
**5. A patient is on a drug that is highly protein-bound. Which of the following conditions would increase the risk of
drug toxicity?**
,A. Increased serum albumin levels.
B. Decreased serum albumin levels.
C. Administration of a drug with a lower protein-binding affinity.
D. Administration of the drug on an empty stomach.
**Answer: B. Decreased serum albumin levels.**
**Rationale:** If a drug is highly protein-bound, only the free (unbound) fraction is pharmacologically active. If
serum albumin is low, there are fewer binding sites, leading to a higher concentration of free drug. This increases
the risk of toxicity, as more of the drug is available to exert its effect.
**6. A patient is experiencing a severe anaphylactic reaction. Which medication would the nurse expect to be
administered first?**
A. Albuterol (bronchodilator)
B. Diphenhydramine (antihistamine)
C. Epinephrine
D. Methylprednisolone (corticosteroid)
**Answer: C. Epinephrine**
**Rationale:** Epinephrine is the first-line treatment for anaphylaxis. It is an alpha- and beta-adrenergic agonist
that rapidly reverses bronchospasm, hypotension, and laryngeal edema. While corticosteroids, antihistamines, and
bronchodilators are used in the management of anaphylaxis, they are considered adjunctive therapies and are not
the primary, immediate life-saving intervention.
**7. The nurse is caring for a patient who has developed a significant drug allergy. The nurse knows this is a type of
adverse effect that is:**
A. Dose-dependent and predictable.
B. Not dose-related and unpredictable.
C. A result of cumulative drug effects.
D. An exaggeration of the therapeutic effect.
, **Answer: B. Not dose-related and unpredictable.**
**Rationale:** Adverse drug reactions (ADRs) are classified as Type A (augmented, predictable, dose-dependent) or
Type B (bizarre, unpredictable, not dose-dependent). Drug allergies are a prime example of a Type B reaction, as
they are immune-mediated and are not related to the drug's pharmacology or dosage.
**8. A patient on a cardiac medication is prescribed a new drug that is a CYP3A4 inhibitor. The nurse should monitor
this patient for:**
A. Decreased effects of the cardiac medication.
B. Increased effects and toxicity of the cardiac medication.
C. No change in the therapeutic effect of the cardiac medication.
D. An anaphylactic reaction to the new drug.
**Answer: B. Increased effects and toxicity of the cardiac medication.**
**Rationale:** CYP450 enzymes, like CYP3A4, are responsible for metabolizing many drugs. If a drug inhibits CYP3A4,
it will decrease the metabolism of other drugs that are substrates of this enzyme. This leads to increased serum
concentrations of those substrates, potentially causing toxicity.
**9. A patient with renal failure is prescribed a drug that is primarily excreted by the kidneys. The nurse anticipates
that the prescriber will:**
A. Increase the dose to achieve a therapeutic effect.
B. Decrease the dose or increase the dosing interval.
C. Keep the dose the same and monitor for adverse effects.
D. Change the route of administration from oral to IV.
**Answer: B. Decrease the dose or increase the dosing interval.**
**Rationale:** In renal failure, drug clearance is reduced. To prevent drug accumulation and toxicity, the dose must
be reduced or the dosing interval must be increased. This is a fundamental principle of pharmacokinetics in patients
with organ dysfunction.
**10. Which phase of clinical drug trials involves a large, diverse patient population and is designed to confirm
efficacy and monitor for adverse effects?**
