Chamberlain University NR 293 Exam 2 (pdf) | 2026/2027 |
Pharmacology Q&A | Nursing Complete Study Guide
1. Which of the following best describes the term used for what the body does to a drug,
including absorption, distribution, metabolism, and excretion?
A) Pharmacodynamics
B) Pharmacotherapeutics
C) Pharmacokinetics
D) Pharmacognosy
Correct Answer: Pharmacokinetics
Rationale: Pharmacokinetics is the study of what the body does to a drug, specifically involving
the processes of absorption, distribution, metabolism, and excretion (ADME).
Pharmacodynamics, in contrast, refers to what the drug does to the body, such as its
biochemical and physiological effects. Understanding these principles is foundational for safe
medication administration and predicting client responses.
2. What is the primary function of an agonist drug when it binds to a receptor site?
A) To block the receptor and prevent a response
B) To bind to the receptor and produce a response
C) To enhance the metabolism of other drugs
D) To increase the excretion of the drug
Correct Answer: To bind to the receptor and produce a response
Rationale: An agonist is a drug that binds to a receptor and activates it to produce a
physiological response. An antagonist, conversely, binds to a receptor but does not produce a
response, instead blocking other substances from binding. This distinction is crucial for
understanding the therapeutic action of various medication classes.
3. A researcher is studying a drug that is highly protein-bound (95%). If a second highly
protein-bound drug is added to the client's regimen, what is the most likely outcome?
A) Decreased effect of the first drug
B) Increased free drug levels and possible toxicity
,C) No significant interaction between the drugs
D) Increased renal excretion of both drugs
Correct Answer: Increased free drug levels and possible toxicity
Rationale: When two highly protein-bound drugs are administered together, they compete for
the same binding sites on plasma proteins. This competition displaces one drug, increasing its
free (unbound) concentration in the bloodstream, which can lead to exaggerated therapeutic
effects or toxicity. Monitoring for adverse effects is essential in clients on multiple protein-
bound medications.
4. Which route of administration has the fastest onset of action for a medication?
A) Oral
B) Subcutaneous
C) Intramuscular
D) Intravenous
Correct Answer: Intravenous
Rationale: Intravenous (IV) administration delivers the drug directly into the bloodstream,
bypassing the absorption phase entirely and providing the most rapid onset of action. Oral,
subcutaneous, and intramuscular routes require the drug to be absorbed before it can exert its
effects, resulting in a delayed onset. This route is preferred in emergencies when immediate
therapeutic effect is needed.
5. According to pharmacokinetic principles, what is the term for the time it takes for one-half
of the original amount of a drug to leave the body?
A) Onset
B) Peak
C) Half-life
D) Duration
Correct Answer: Half-life
Rationale: Half-life is the time required for the serum concentration of a drug to decrease by
50%. This parameter is essential for determining appropriate dosing intervals and predicting
how long a drug will remain active in the body. Onset refers to the time to first response, peak is
the time to maximum effect, and duration is the length of the therapeutic response.
,6. What is the term for the metabolism of an oral drug by the liver before it reaches systemic
circulation, reducing its bioavailability?
A) First-pass effect
B) Protein binding
C) Renal excretion
D) Blood-brain barrier crossing
Correct Answer: First-pass effect
Rationale: The first-pass effect refers to the metabolism of an oral drug by the liver before it
enters the systemic circulation. This process can significantly reduce the bioavailability of certain
medications, necessitating higher oral doses or alternative routes of administration. Drugs
administered intravenously bypass this effect entirely.
7. A nurse is reviewing the mechanism of action of enoxaparin. Which statement correctly
describes how this low-molecular-weight heparin (LMWH) differs from unfractionated
heparin (UFH)?
A) LMWH inactivates both thrombin and factor Xa equally
B) LMWH primarily inactivates factor Xa with less effect on thrombin
C) LMWH directly inhibits thrombin without requiring antithrombin III
D) LMWH has a shorter half-life and requires more frequent dosing
Correct Answer: LMWH primarily inactivates factor Xa with less effect on thrombin
Rationale: Low-molecular-weight heparin (LMWH), such as enoxaparin, has a shorter
polysaccharide chain that preferentially binds antithrombin and inactivates factor Xa, with less
effect on thrombin compared to UFH. This difference explains LMWH's more predictable
pharmacokinetics, longer half-life, and the lack of need for routine aPTT monitoring. UFH
inactivates both thrombin and factor Xa.
8. A client has a new prescription for warfarin. Which laboratory value should the nurse
monitor to evaluate the therapeutic effect of this medication?
A) aPTT
B) INR
C) Platelet count
, D) Bleeding time
Correct Answer: INR
Rationale: Warfarin therapy is monitored using the International Normalized Ratio (INR), which
assesses the extrinsic pathway of coagulation. The therapeutic INR range for most indications is
2.0 to 3.0. aPTT is used to monitor unfractionated heparin therapy, not warfarin. Platelet count
and bleeding time do not reflect warfarin's anticoagulant effect.
9. If a client is receiving intravenous furosemide, which electrolyte imbalance is most likely
to occur?
A) Hyperkalemia
B) Hypokalemia
C) Hypernatremia
D) Hypercalcemia
Correct Answer: Hypokalemia
Rationale: Loop diuretics such as furosemide act on the ascending loop of Henle to inhibit
sodium and chloride reabsorption, leading to increased excretion of potassium as well.
Hypokalemia is a common adverse effect and can potentiate digoxin toxicity and cause cardiac
dysrhythmias. Clients should be monitored for low potassium levels and may require
supplementation.
10. Which drug, used for the treatment of hypothyroidism, can accelerate bone loss if taken in
excessive doses?
A) Methimazole
B) Levothyroxine
C) Propylthiouracil
D) Radioactive iodine
Correct Answer: Levothyroxine
Rationale: Levothyroxine is a synthetic thyroid hormone used to treat hypothyroidism. When
taken in excessive doses, it can induce a hyperthyroid state, which accelerates bone turnover and
leads to bone loss and osteoporosis over time. Clients should be monitored with thyroid function
tests to ensure proper dosing.
Pharmacology Q&A | Nursing Complete Study Guide
1. Which of the following best describes the term used for what the body does to a drug,
including absorption, distribution, metabolism, and excretion?
A) Pharmacodynamics
B) Pharmacotherapeutics
C) Pharmacokinetics
D) Pharmacognosy
Correct Answer: Pharmacokinetics
Rationale: Pharmacokinetics is the study of what the body does to a drug, specifically involving
the processes of absorption, distribution, metabolism, and excretion (ADME).
Pharmacodynamics, in contrast, refers to what the drug does to the body, such as its
biochemical and physiological effects. Understanding these principles is foundational for safe
medication administration and predicting client responses.
2. What is the primary function of an agonist drug when it binds to a receptor site?
A) To block the receptor and prevent a response
B) To bind to the receptor and produce a response
C) To enhance the metabolism of other drugs
D) To increase the excretion of the drug
Correct Answer: To bind to the receptor and produce a response
Rationale: An agonist is a drug that binds to a receptor and activates it to produce a
physiological response. An antagonist, conversely, binds to a receptor but does not produce a
response, instead blocking other substances from binding. This distinction is crucial for
understanding the therapeutic action of various medication classes.
3. A researcher is studying a drug that is highly protein-bound (95%). If a second highly
protein-bound drug is added to the client's regimen, what is the most likely outcome?
A) Decreased effect of the first drug
B) Increased free drug levels and possible toxicity
,C) No significant interaction between the drugs
D) Increased renal excretion of both drugs
Correct Answer: Increased free drug levels and possible toxicity
Rationale: When two highly protein-bound drugs are administered together, they compete for
the same binding sites on plasma proteins. This competition displaces one drug, increasing its
free (unbound) concentration in the bloodstream, which can lead to exaggerated therapeutic
effects or toxicity. Monitoring for adverse effects is essential in clients on multiple protein-
bound medications.
4. Which route of administration has the fastest onset of action for a medication?
A) Oral
B) Subcutaneous
C) Intramuscular
D) Intravenous
Correct Answer: Intravenous
Rationale: Intravenous (IV) administration delivers the drug directly into the bloodstream,
bypassing the absorption phase entirely and providing the most rapid onset of action. Oral,
subcutaneous, and intramuscular routes require the drug to be absorbed before it can exert its
effects, resulting in a delayed onset. This route is preferred in emergencies when immediate
therapeutic effect is needed.
5. According to pharmacokinetic principles, what is the term for the time it takes for one-half
of the original amount of a drug to leave the body?
A) Onset
B) Peak
C) Half-life
D) Duration
Correct Answer: Half-life
Rationale: Half-life is the time required for the serum concentration of a drug to decrease by
50%. This parameter is essential for determining appropriate dosing intervals and predicting
how long a drug will remain active in the body. Onset refers to the time to first response, peak is
the time to maximum effect, and duration is the length of the therapeutic response.
,6. What is the term for the metabolism of an oral drug by the liver before it reaches systemic
circulation, reducing its bioavailability?
A) First-pass effect
B) Protein binding
C) Renal excretion
D) Blood-brain barrier crossing
Correct Answer: First-pass effect
Rationale: The first-pass effect refers to the metabolism of an oral drug by the liver before it
enters the systemic circulation. This process can significantly reduce the bioavailability of certain
medications, necessitating higher oral doses or alternative routes of administration. Drugs
administered intravenously bypass this effect entirely.
7. A nurse is reviewing the mechanism of action of enoxaparin. Which statement correctly
describes how this low-molecular-weight heparin (LMWH) differs from unfractionated
heparin (UFH)?
A) LMWH inactivates both thrombin and factor Xa equally
B) LMWH primarily inactivates factor Xa with less effect on thrombin
C) LMWH directly inhibits thrombin without requiring antithrombin III
D) LMWH has a shorter half-life and requires more frequent dosing
Correct Answer: LMWH primarily inactivates factor Xa with less effect on thrombin
Rationale: Low-molecular-weight heparin (LMWH), such as enoxaparin, has a shorter
polysaccharide chain that preferentially binds antithrombin and inactivates factor Xa, with less
effect on thrombin compared to UFH. This difference explains LMWH's more predictable
pharmacokinetics, longer half-life, and the lack of need for routine aPTT monitoring. UFH
inactivates both thrombin and factor Xa.
8. A client has a new prescription for warfarin. Which laboratory value should the nurse
monitor to evaluate the therapeutic effect of this medication?
A) aPTT
B) INR
C) Platelet count
, D) Bleeding time
Correct Answer: INR
Rationale: Warfarin therapy is monitored using the International Normalized Ratio (INR), which
assesses the extrinsic pathway of coagulation. The therapeutic INR range for most indications is
2.0 to 3.0. aPTT is used to monitor unfractionated heparin therapy, not warfarin. Platelet count
and bleeding time do not reflect warfarin's anticoagulant effect.
9. If a client is receiving intravenous furosemide, which electrolyte imbalance is most likely
to occur?
A) Hyperkalemia
B) Hypokalemia
C) Hypernatremia
D) Hypercalcemia
Correct Answer: Hypokalemia
Rationale: Loop diuretics such as furosemide act on the ascending loop of Henle to inhibit
sodium and chloride reabsorption, leading to increased excretion of potassium as well.
Hypokalemia is a common adverse effect and can potentiate digoxin toxicity and cause cardiac
dysrhythmias. Clients should be monitored for low potassium levels and may require
supplementation.
10. Which drug, used for the treatment of hypothyroidism, can accelerate bone loss if taken in
excessive doses?
A) Methimazole
B) Levothyroxine
C) Propylthiouracil
D) Radioactive iodine
Correct Answer: Levothyroxine
Rationale: Levothyroxine is a synthetic thyroid hormone used to treat hypothyroidism. When
taken in excessive doses, it can induce a hyperthyroid state, which accelerates bone turnover and
leads to bone loss and osteoporosis over time. Clients should be monitored with thyroid function
tests to ensure proper dosing.
