NUR 334 Final Exam: Pharmacology I V3 - Arizona College
Updated and Latest Questions and Correct Answers with
Rationale
1. A patient with a high body fat percentage is prescribed a highly lipid-soluble drug. How will this affect the
drug’s distribution?
A. The drug will be excreted more rapidly by the kidneys.
B. The drug will have a shorter half-life in the body.
C. The drug will have a higher concentration in the blood plasma.
D. The drug will remain in the body longer due to storage in adipose tissue.
Ans: D
Explanation: Lipid-soluble drugs have a high affinity for adipose tissue where they can be stored. This
storage causes the drug to stay in the body for an extended period. Distribution is heavily influenced by
the patient’s body composition and the drug’s chemical properties. Nurses must be aware that obese
patients may experience prolonged effects of such medications. Monitoring for cumulative toxicity is
essential in these clinical scenarios.
2. When administering a drug with a narrow therapeutic index, which nursing action is most important?
A. Monitor serum drug levels frequently as ordered.
B. Administer the drug with a full glass of water.
C. Ask the patient to report any mild headaches.
D. Provide the medication only on an as-needed basis.
Ans: A
,Explanation: A narrow therapeutic index means the difference between a therapeutic dose and a toxic
dose is very small. Frequent monitoring of serum drug levels is required to ensure safety and efficacy. If
the level is too low, the drug is ineffective, but if it is too high, toxicity occurs. Nurses must coordinate
with the laboratory to obtain accurate peak and trough measurements. This vigilance prevents severe
adverse reactions and ensures optimal patient outcomes.
3. Which process is primarily responsible for the ‘first-pass effect’ of oral medications?
A. Gastric emptying into the small intestine.
B. Binding of the drug to albumin in the bloodstream.
C. Excretion by the kidneys through glomerular filtration.
D. Metabolism by liver enzymes before reaching systemic circulation.
Ans: D
Explanation: The first-pass effect occurs when an oral drug is absorbed and carried to the liver via the
portal vein. Liver enzymes metabolize a significant portion of the drug before it reaches the rest of the
body. This process reduces the overall bioavailability of the medication available for therapeutic use.
Consequently, oral doses are often much higher than intravenous doses of the same drug. Understanding
this concept helps nurses explain why different routes of administration require different dosages.
4. A patient is taking a drug that is a known cytochrome P450 (CYP450) enzyme inhibitor. What should the
nurse expect if a second drug metabolized by the same enzyme is added?
A. The second drug will be excreted faster.
B. The second drug will have a decreased therapeutic effect.
C. The second drug may reach toxic levels in the blood.
D. The second drug will not be absorbed in the GI tract.
, Ans: C
Explanation: Enzyme inhibitors slow down the metabolism of other drugs processed by the same
enzyme system. This leads to higher concentrations of the second drug remaining in the bloodstream.
Increased drug levels significantly raise the risk of adverse effects and toxicity for the patient. Nurses
must review the patient’s entire medication list for potential drug-drug interactions. Constant assessment
for signs of toxicity is required when such combinations are unavoidable.
5. Which patient is at the highest risk for drug toxicity related to impaired drug metabolism?
A. A 25-year-old with a history of asthma.
B. A 45-year-old with chronic kidney disease.
C. A 10-year-old with type 1 diabetes mellitus.
D. An 80-year-old with advanced cirrhosis of the liver.
Ans: D
Explanation: The liver is the primary organ responsible for the metabolism of most medications.
Advanced cirrhosis severely impairs the liver’s ability to process drugs into inactive metabolites. This
impairment results in higher circulating levels of active drugs and an increased risk of toxicity. Elderly
patients are particularly vulnerable because they often have reduced physiological reserves. Nurses must
advocate for lower dosages and more frequent monitoring in patients with hepatic failure.
6. What is the primary goal of administering a loading dose of a medication?
A. To minimize the risk of drug-related side effects.
B. To achieve a therapeutic drug level more quickly.
C. To prevent the drug from being metabolized by the liver.
D. To ensure the drug remains in the system for several days.
Updated and Latest Questions and Correct Answers with
Rationale
1. A patient with a high body fat percentage is prescribed a highly lipid-soluble drug. How will this affect the
drug’s distribution?
A. The drug will be excreted more rapidly by the kidneys.
B. The drug will have a shorter half-life in the body.
C. The drug will have a higher concentration in the blood plasma.
D. The drug will remain in the body longer due to storage in adipose tissue.
Ans: D
Explanation: Lipid-soluble drugs have a high affinity for adipose tissue where they can be stored. This
storage causes the drug to stay in the body for an extended period. Distribution is heavily influenced by
the patient’s body composition and the drug’s chemical properties. Nurses must be aware that obese
patients may experience prolonged effects of such medications. Monitoring for cumulative toxicity is
essential in these clinical scenarios.
2. When administering a drug with a narrow therapeutic index, which nursing action is most important?
A. Monitor serum drug levels frequently as ordered.
B. Administer the drug with a full glass of water.
C. Ask the patient to report any mild headaches.
D. Provide the medication only on an as-needed basis.
Ans: A
,Explanation: A narrow therapeutic index means the difference between a therapeutic dose and a toxic
dose is very small. Frequent monitoring of serum drug levels is required to ensure safety and efficacy. If
the level is too low, the drug is ineffective, but if it is too high, toxicity occurs. Nurses must coordinate
with the laboratory to obtain accurate peak and trough measurements. This vigilance prevents severe
adverse reactions and ensures optimal patient outcomes.
3. Which process is primarily responsible for the ‘first-pass effect’ of oral medications?
A. Gastric emptying into the small intestine.
B. Binding of the drug to albumin in the bloodstream.
C. Excretion by the kidneys through glomerular filtration.
D. Metabolism by liver enzymes before reaching systemic circulation.
Ans: D
Explanation: The first-pass effect occurs when an oral drug is absorbed and carried to the liver via the
portal vein. Liver enzymes metabolize a significant portion of the drug before it reaches the rest of the
body. This process reduces the overall bioavailability of the medication available for therapeutic use.
Consequently, oral doses are often much higher than intravenous doses of the same drug. Understanding
this concept helps nurses explain why different routes of administration require different dosages.
4. A patient is taking a drug that is a known cytochrome P450 (CYP450) enzyme inhibitor. What should the
nurse expect if a second drug metabolized by the same enzyme is added?
A. The second drug will be excreted faster.
B. The second drug will have a decreased therapeutic effect.
C. The second drug may reach toxic levels in the blood.
D. The second drug will not be absorbed in the GI tract.
, Ans: C
Explanation: Enzyme inhibitors slow down the metabolism of other drugs processed by the same
enzyme system. This leads to higher concentrations of the second drug remaining in the bloodstream.
Increased drug levels significantly raise the risk of adverse effects and toxicity for the patient. Nurses
must review the patient’s entire medication list for potential drug-drug interactions. Constant assessment
for signs of toxicity is required when such combinations are unavoidable.
5. Which patient is at the highest risk for drug toxicity related to impaired drug metabolism?
A. A 25-year-old with a history of asthma.
B. A 45-year-old with chronic kidney disease.
C. A 10-year-old with type 1 diabetes mellitus.
D. An 80-year-old with advanced cirrhosis of the liver.
Ans: D
Explanation: The liver is the primary organ responsible for the metabolism of most medications.
Advanced cirrhosis severely impairs the liver’s ability to process drugs into inactive metabolites. This
impairment results in higher circulating levels of active drugs and an increased risk of toxicity. Elderly
patients are particularly vulnerable because they often have reduced physiological reserves. Nurses must
advocate for lower dosages and more frequent monitoring in patients with hepatic failure.
6. What is the primary goal of administering a loading dose of a medication?
A. To minimize the risk of drug-related side effects.
B. To achieve a therapeutic drug level more quickly.
C. To prevent the drug from being metabolized by the liver.
D. To ensure the drug remains in the system for several days.
