,NURS 6521 Week 10 Quiz | Advanced Pharmacology (2026)
Q&A | Walden University
1. Which of the following best describes the primary purpose of a loading dose in
pharmacotherapy?
A) To rapidly achieve therapeutic drug concentrations in the bloodstream
B) To maintain steady-state drug levels after the initial dose
C) To reduce the risk of cumulative drug toxicity
D) To prolong the elimination half-life of a medication
Correct Answer: To rapidly achieve therapeutic drug concentrations in the
bloodstream
Rationale: A loading dose is given to quickly reach therapeutic drug levels, especially
for drugs with long half-lives or in urgent clinical situations. Maintenance doses then
sustain those levels. Loading doses do not primarily maintain steady state, reduce
cumulative toxicity, or prolong half-life.
2. What is the primary mechanism by which enzyme inducers alter drug metabolism?
A) They inhibit cytochrome P450 enzymes and increase drug levels
B) They increase cytochrome P450 activity and reduce substrate drug levels
C) They block renal tubular secretion of drugs
D) They increase plasma protein binding of drugs
Correct Answer: They increase cytochrome P450 activity and reduce substrate drug
levels
,Rationale: Enzyme inducers such as rifampin and phenytoin increase cytochrome
P450 enzyme activity, accelerating the metabolism of substrate drugs and lowering
their plasma concentrations. This can reduce therapeutic efficacy. Enzyme inhibitors
have the opposite effect.
3. Which medication is most appropriate for reversing warfarin anticoagulation in a
patient with major bleeding?
A) Protamine sulfate
B) Idarucizumab
C) Four-factor prothrombin complex concentrate
D) Naloxone
Correct Answer: Four-factor prothrombin complex concentrate
Rationale: Four-factor prothrombin complex concentrate rapidly replaces vitamin K-
dependent clotting factors and is preferred for urgent warfarin reversal with major
bleeding. Protamine reverses heparin, idarucizumab reverses dabigatran, and
naloxone reverses opioids. Vitamin K is also given but has a slower onset.
4. Which adverse effect is most closely associated with long-term amiodarone
therapy?
A) Pulmonary fibrosis
B) Hemorrhagic cystitis
C) Peripheral neuropathy
D) Nephrotoxicity
, Correct Answer: Pulmonary fibrosis
Rationale: Amiodarone can cause pulmonary fibrosis, thyroid dysfunction, corneal
microdeposits, hepatotoxicity, and peripheral neuropathy. Pulmonary toxicity is a
serious and potentially fatal adverse effect requiring monitoring. Hemorrhagic cystitis
is associated with cyclophosphamide, and nephrotoxicity with aminoglycosides.
5. A nurse is reviewing a medication order for a drug with a narrow therapeutic index.
Which action is most important?
A) Administering the drug with food to reduce gastrointestinal upset
B) Monitoring serum drug levels closely and assessing for toxicity
C) Using the oral route whenever possible
D) Avoiding all concurrent medications
Correct Answer: Monitoring serum drug levels closely and assessing for toxicity
Rationale: Drugs with a narrow therapeutic index have a small margin between
therapeutic and toxic concentrations. Close monitoring of serum levels, renal
function, and clinical signs of toxicity is essential. Food, route, and concurrent
medications may matter but are not the primary concern.
6. According to pharmacokinetic principles, which organ is primarily responsible for
drug excretion?
A) Liver
B) Lungs
C) Kidneys
D) Spleen
Q&A | Walden University
1. Which of the following best describes the primary purpose of a loading dose in
pharmacotherapy?
A) To rapidly achieve therapeutic drug concentrations in the bloodstream
B) To maintain steady-state drug levels after the initial dose
C) To reduce the risk of cumulative drug toxicity
D) To prolong the elimination half-life of a medication
Correct Answer: To rapidly achieve therapeutic drug concentrations in the
bloodstream
Rationale: A loading dose is given to quickly reach therapeutic drug levels, especially
for drugs with long half-lives or in urgent clinical situations. Maintenance doses then
sustain those levels. Loading doses do not primarily maintain steady state, reduce
cumulative toxicity, or prolong half-life.
2. What is the primary mechanism by which enzyme inducers alter drug metabolism?
A) They inhibit cytochrome P450 enzymes and increase drug levels
B) They increase cytochrome P450 activity and reduce substrate drug levels
C) They block renal tubular secretion of drugs
D) They increase plasma protein binding of drugs
Correct Answer: They increase cytochrome P450 activity and reduce substrate drug
levels
,Rationale: Enzyme inducers such as rifampin and phenytoin increase cytochrome
P450 enzyme activity, accelerating the metabolism of substrate drugs and lowering
their plasma concentrations. This can reduce therapeutic efficacy. Enzyme inhibitors
have the opposite effect.
3. Which medication is most appropriate for reversing warfarin anticoagulation in a
patient with major bleeding?
A) Protamine sulfate
B) Idarucizumab
C) Four-factor prothrombin complex concentrate
D) Naloxone
Correct Answer: Four-factor prothrombin complex concentrate
Rationale: Four-factor prothrombin complex concentrate rapidly replaces vitamin K-
dependent clotting factors and is preferred for urgent warfarin reversal with major
bleeding. Protamine reverses heparin, idarucizumab reverses dabigatran, and
naloxone reverses opioids. Vitamin K is also given but has a slower onset.
4. Which adverse effect is most closely associated with long-term amiodarone
therapy?
A) Pulmonary fibrosis
B) Hemorrhagic cystitis
C) Peripheral neuropathy
D) Nephrotoxicity
, Correct Answer: Pulmonary fibrosis
Rationale: Amiodarone can cause pulmonary fibrosis, thyroid dysfunction, corneal
microdeposits, hepatotoxicity, and peripheral neuropathy. Pulmonary toxicity is a
serious and potentially fatal adverse effect requiring monitoring. Hemorrhagic cystitis
is associated with cyclophosphamide, and nephrotoxicity with aminoglycosides.
5. A nurse is reviewing a medication order for a drug with a narrow therapeutic index.
Which action is most important?
A) Administering the drug with food to reduce gastrointestinal upset
B) Monitoring serum drug levels closely and assessing for toxicity
C) Using the oral route whenever possible
D) Avoiding all concurrent medications
Correct Answer: Monitoring serum drug levels closely and assessing for toxicity
Rationale: Drugs with a narrow therapeutic index have a small margin between
therapeutic and toxic concentrations. Close monitoring of serum levels, renal
function, and clinical signs of toxicity is essential. Food, route, and concurrent
medications may matter but are not the primary concern.
6. According to pharmacokinetic principles, which organ is primarily responsible for
drug excretion?
A) Liver
B) Lungs
C) Kidneys
D) Spleen
