NURS 180 | NURS180 Exam 1: Pharmacology - WCU
Updated and Latest Questions and Correct
Answers with Rationale
1. A nurse is preparing to administer an oral medication. Which physiological factor should
the nurse identify as most significantly affecting the rate of drug absorption in the
gastrointestinal tract?
A. The blood-brain barrier permeability
B. The level of plasma protein binding
C. The glomerular filtration rate
D. The pH environment of the stomach
Correct Answer: D
Expert Explanation: The pH of the gastric environment plays a vital role in how quickly a
drug dissolves and ionizes for absorption. Acidic drugs are absorbed more readily in the
stomach while basic drugs are absorbed in the small intestine. Other factors like blood-
brain barrier and renal filtration relate to distribution and excretion rather than initial
absorption. If a patient is taking antacids, the absorption of certain medications may be
delayed or reduced. Therefore, understanding the chemical nature of the drug and the
target site pH is essential for safe administration.
2. When administering a drug that is known to be highly protein-bound, the nurse notes the
patient has a very low serum albumin level. What is the priority concern for this patient?
A. The drug will be rapidly excreted by the kidneys
B. The onset of action for the drug will be delayed
C. The drug will remain inactive in the bloodstream
D. The patient is at an increased risk for drug toxicity
Correct Answer: D
Expert Explanation: Albumin is the primary protein to which drugs bind within the
systemic circulation. When albumin levels are low, there are fewer sites available for the
drug molecules to attach. This leads to an increase in the concentration of free, active drug
circulating in the blood. Increased levels of free drug significantly raise the risk of adverse
reactions and toxicity. The nurse must monitor these patients closely for unexpected
pharmacological responses.
,3. A patient is prescribed a medication that undergoes a significant ‘first-pass effect.’ Which
route of administration would the nurse expect the healthcare provider to avoid to ensure
maximum bioavailability?
A. Sublingual
B. Intravenous
C. Transdermal
D. Oral
Correct Answer: D
Expert Explanation: The first-pass effect occurs when a medication is metabolized by the
liver before it reaches the systemic circulation. Drugs taken orally are absorbed in the GI
tract and carried via the portal vein directly to the liver. This process can significantly
reduce the amount of active drug available to the body. Parenteral routes like IV or
sublingual bypass the liver initially, maintaining higher bioavailability. Consequently, oral
doses are often much higher than IV doses for the same medication.
4. A nurse is caring for a patient with chronic renal failure. What adjustment in drug therapy
does the nurse anticipate based on the pharmacokinetics of excretion?
A. An increase in the dosage amount
B. A reduction in the dosage or frequency
C. A decrease in the dosing interval
D. The use of a higher loading dose
Correct Answer: B
Expert Explanation: The kidneys are the primary organs responsible for the excretion of
drugs and their metabolites. In patients with renal failure, the body cannot clear
medications efficiently, leading to potential accumulation. To prevent toxicity, the nurse
should expect orders for lower doses or longer intervals between doses. Monitoring serum
creatinine and BUN levels is a critical nursing responsibility in these cases. Failing to adjust
the dose could result in severe systemic adverse effects.
5. Which statement best describes the concept of a drug’s half-life?
A. The amount of time it takes for 50% of the drug to be eliminated from the body
B. The time required for the drug to reach its peak concentration
C. The duration of time the drug produces a therapeutic effect
D. The time it takes for the drug to be completely absorbed
Correct Answer: A
, Expert Explanation: The half-life of a drug is a pharmacokinetic parameter defined as the
time needed for the plasma concentration to decrease by half. This value determines how
frequently a medication needs to be administered to maintain a steady state. Drugs with
short half-lives require more frequent dosing than those with long half-lives. It usually
takes about four to five half-lives for a drug to be almost entirely eliminated from the body.
Nurses use this information to educate patients on the importance of maintaining a strict
dosing schedule.
6. The nurse is reviewing a new medication order and notes the drug has a ‘narrow
therapeutic index.’ What is the nurse’s priority action?
A. Administer the drug immediately as it is highly potent
B. Instruct the patient that the drug is very safe to use
C. Monitor serum drug levels closely to prevent toxicity
D. Suggest a different medication with a wider index
Correct Answer: C
Expert Explanation: A narrow therapeutic index means there is a very small difference
between a therapeutic dose and a toxic dose. Medications in this category require precise
dosing and frequent blood monitoring to ensure patient safety. Examples include drugs like
digoxin, warfarin, and lithium. The nurse must be vigilant for signs of toxicity even if the
dose appears standard. Patient education should focus on the necessity of regular
laboratory follow-ups.
7. A patient is given a medication that acts as an ‘agonist’ at a specific receptor site. How
should the nurse explain the action of this drug to the patient?
A. The drug blocks the receptor to prevent a response
B. The drug mimics the body’s natural chemicals to trigger a response
C. The drug destroys the receptor site permanently
D. The drug attaches to the receptor but produces no effect
Correct Answer: B
Expert Explanation: An agonist is a molecule that binds to a receptor and activates it to
produce a biological response. It essentially mimics the action of endogenous substances
like hormones or neurotransmitters. For example, morphine is an agonist at opioid
receptors, resulting in pain relief. In contrast, an antagonist would block the receptor and
prevent activation. Understanding this relationship helps the nurse anticipate the intended
physiological effects of the treatment.
8. A nurse is preparing to administer a STAT dose of an intravenous antibiotic. Which
pharmacokinetic phase is bypassed when a drug is administered intravenously?
A. Absorption
Updated and Latest Questions and Correct
Answers with Rationale
1. A nurse is preparing to administer an oral medication. Which physiological factor should
the nurse identify as most significantly affecting the rate of drug absorption in the
gastrointestinal tract?
A. The blood-brain barrier permeability
B. The level of plasma protein binding
C. The glomerular filtration rate
D. The pH environment of the stomach
Correct Answer: D
Expert Explanation: The pH of the gastric environment plays a vital role in how quickly a
drug dissolves and ionizes for absorption. Acidic drugs are absorbed more readily in the
stomach while basic drugs are absorbed in the small intestine. Other factors like blood-
brain barrier and renal filtration relate to distribution and excretion rather than initial
absorption. If a patient is taking antacids, the absorption of certain medications may be
delayed or reduced. Therefore, understanding the chemical nature of the drug and the
target site pH is essential for safe administration.
2. When administering a drug that is known to be highly protein-bound, the nurse notes the
patient has a very low serum albumin level. What is the priority concern for this patient?
A. The drug will be rapidly excreted by the kidneys
B. The onset of action for the drug will be delayed
C. The drug will remain inactive in the bloodstream
D. The patient is at an increased risk for drug toxicity
Correct Answer: D
Expert Explanation: Albumin is the primary protein to which drugs bind within the
systemic circulation. When albumin levels are low, there are fewer sites available for the
drug molecules to attach. This leads to an increase in the concentration of free, active drug
circulating in the blood. Increased levels of free drug significantly raise the risk of adverse
reactions and toxicity. The nurse must monitor these patients closely for unexpected
pharmacological responses.
,3. A patient is prescribed a medication that undergoes a significant ‘first-pass effect.’ Which
route of administration would the nurse expect the healthcare provider to avoid to ensure
maximum bioavailability?
A. Sublingual
B. Intravenous
C. Transdermal
D. Oral
Correct Answer: D
Expert Explanation: The first-pass effect occurs when a medication is metabolized by the
liver before it reaches the systemic circulation. Drugs taken orally are absorbed in the GI
tract and carried via the portal vein directly to the liver. This process can significantly
reduce the amount of active drug available to the body. Parenteral routes like IV or
sublingual bypass the liver initially, maintaining higher bioavailability. Consequently, oral
doses are often much higher than IV doses for the same medication.
4. A nurse is caring for a patient with chronic renal failure. What adjustment in drug therapy
does the nurse anticipate based on the pharmacokinetics of excretion?
A. An increase in the dosage amount
B. A reduction in the dosage or frequency
C. A decrease in the dosing interval
D. The use of a higher loading dose
Correct Answer: B
Expert Explanation: The kidneys are the primary organs responsible for the excretion of
drugs and their metabolites. In patients with renal failure, the body cannot clear
medications efficiently, leading to potential accumulation. To prevent toxicity, the nurse
should expect orders for lower doses or longer intervals between doses. Monitoring serum
creatinine and BUN levels is a critical nursing responsibility in these cases. Failing to adjust
the dose could result in severe systemic adverse effects.
5. Which statement best describes the concept of a drug’s half-life?
A. The amount of time it takes for 50% of the drug to be eliminated from the body
B. The time required for the drug to reach its peak concentration
C. The duration of time the drug produces a therapeutic effect
D. The time it takes for the drug to be completely absorbed
Correct Answer: A
, Expert Explanation: The half-life of a drug is a pharmacokinetic parameter defined as the
time needed for the plasma concentration to decrease by half. This value determines how
frequently a medication needs to be administered to maintain a steady state. Drugs with
short half-lives require more frequent dosing than those with long half-lives. It usually
takes about four to five half-lives for a drug to be almost entirely eliminated from the body.
Nurses use this information to educate patients on the importance of maintaining a strict
dosing schedule.
6. The nurse is reviewing a new medication order and notes the drug has a ‘narrow
therapeutic index.’ What is the nurse’s priority action?
A. Administer the drug immediately as it is highly potent
B. Instruct the patient that the drug is very safe to use
C. Monitor serum drug levels closely to prevent toxicity
D. Suggest a different medication with a wider index
Correct Answer: C
Expert Explanation: A narrow therapeutic index means there is a very small difference
between a therapeutic dose and a toxic dose. Medications in this category require precise
dosing and frequent blood monitoring to ensure patient safety. Examples include drugs like
digoxin, warfarin, and lithium. The nurse must be vigilant for signs of toxicity even if the
dose appears standard. Patient education should focus on the necessity of regular
laboratory follow-ups.
7. A patient is given a medication that acts as an ‘agonist’ at a specific receptor site. How
should the nurse explain the action of this drug to the patient?
A. The drug blocks the receptor to prevent a response
B. The drug mimics the body’s natural chemicals to trigger a response
C. The drug destroys the receptor site permanently
D. The drug attaches to the receptor but produces no effect
Correct Answer: B
Expert Explanation: An agonist is a molecule that binds to a receptor and activates it to
produce a biological response. It essentially mimics the action of endogenous substances
like hormones or neurotransmitters. For example, morphine is an agonist at opioid
receptors, resulting in pain relief. In contrast, an antagonist would block the receptor and
prevent activation. Understanding this relationship helps the nurse anticipate the intended
physiological effects of the treatment.
8. A nurse is preparing to administer a STAT dose of an intravenous antibiotic. Which
pharmacokinetic phase is bypassed when a drug is administered intravenously?
A. Absorption
