NSG 318 Exams 1–4 Introduction to Pharmacology | Latest
Update 2026/2027 | Questions and Verified Answers with
Rationales | 100% Correct | GCU
1. What is the primary focus of pharmacology?
A) The study of drug prices and economics
B) The study of drugs and their action on living organisms
C) The study of disease progression in the body
D) The study of nursing interventions without medications
Correct Answer: B
Rationale: Pharmacology is the scientific study of drugs, including their origin, composition,
pharmacokinetics, pharmacodynamics, therapeutic use, and toxicology. It focuses on how drugs interact
with living systems to produce a biological effect.
2. A drug that binds to a receptor and produces a maximal response is called a:
A) Antagonist
B) Partial agonist
C) Agonist
D) Competitive inhibitor
Correct Answer: C
Rationale: An agonist is a drug that binds to a receptor and activates it, producing a biological response.
A full agonist produces the maximal possible effect, while a partial agonist produces a weaker response.
Antagonists block the receptor without activating it.
,3. Which route of drug administration undergoes the first-pass effect?
A) Intravenous
B) Sublingual
C) Oral
D) Transdermal
Correct Answer: C
Rationale: The first-pass effect refers to the liver's metabolism of a drug before it reaches systemic
circulation. Orally administered drugs are absorbed from the GI tract and travel to the liver via the portal
vein, where they may be extensively metabolized. Other routes bypass the portal circulation and avoid
the first-pass effect.
4. A patient asks what "half-life" means. The nurse explains that half-life is the time it takes for:
A) A drug to reach its peak concentration in the blood
B) The body to eliminate half of the drug's concentration
C) A drug to cause half of its therapeutic effect
D) The drug to be absorbed into the bloodstream
Correct Answer: B
Rationale: Half-life is defined as the time required for the plasma concentration of a drug to decrease by
50% (to be reduced by half). It is a key pharmacokinetic parameter that determines dosing frequency
and time to reach steady state (typically 4–5 half-lives).
5. Which term describes the process by which a drug moves from the administration site into the
bloodstream?
A) Distribution
B) Metabolism
,C) Absorption
D) Excretion
Correct Answer: C
Rationale: Absorption is the movement of a drug from its site of administration into the systemic
circulation. It is the first pharmacokinetic phase; factors such as route of administration, solubility, and
blood flow influence absorption rate and extent.
6. What is the most important responsibility of a nurse regarding medication administration?
A) Memorizing all drug names and doses
B) Ensuring the right drug, right dose, right patient, right route, and right time (Five Rights)
C) Administering all medications as fast as possible
D) Delegating medication administration to unlicensed personnel
Correct Answer: B
Rationale: The "Five Rights" (right patient, right drug, right dose, right route, right time) are the
foundation of safe medication administration. Additional rights include right documentation, right
indication, right to refuse, and right assessment. Adherence to these principles reduces medication
errors and enhances patient safety.
7. A nurse is preparing to administer digoxin. Which assessment finding would require the nurse to hold
the medication and contact the healthcare provider?
A) Heart rate of 58 beats/minute in an adult
B) Blood pressure of 130/80 mmHg
C) Respiratory rate of 18 breaths/minute
D) Serum potassium of 4.2 mEq/L
, Correct Answer: A
Rationale: Digoxin slows the heart rate and can cause bradycardia. For an adult, a heart rate below 60
beats/minute is a common parameter for holding digoxin. Hypokalemia increases the risk of digoxin
toxicity, but a potassium of 4.2 mEq/L is within normal limits.
8. A patient is prescribed warfarin. Which laboratory value should the nurse monitor to assess
therapeutic effect?
A) aPTT
B) INR
C) Platelet count
D) Bleeding time
Correct Answer: B
Rationale: Warfarin is an anticoagulant that inhibits vitamin K-dependent clotting factors (II, VII, IX, X).
Its therapeutic effect is monitored using the International Normalized Ratio (INR). The target INR
depends on the indication (e.g., 2–3 for atrial fibrillation). aPTT monitors heparin.
9. A patient is prescribed furosemide (Lasix). Which electrolyte imbalance is a common adverse effect?
A) Hyperkalemia
B) Hypokalemia
C) Hypernatremia
D) Hypercalcemia
Correct Answer: B
Rationale: Furosemide is a loop diuretic that inhibits sodium and chloride reabsorption in the thick
ascending loop of Henle. It causes increased excretion of potassium and magnesium, leading to
hypokalemia. Monitoring serum electrolytes and providing potassium supplementation or a potassium-
sparing diuretic may be necessary.
Update 2026/2027 | Questions and Verified Answers with
Rationales | 100% Correct | GCU
1. What is the primary focus of pharmacology?
A) The study of drug prices and economics
B) The study of drugs and their action on living organisms
C) The study of disease progression in the body
D) The study of nursing interventions without medications
Correct Answer: B
Rationale: Pharmacology is the scientific study of drugs, including their origin, composition,
pharmacokinetics, pharmacodynamics, therapeutic use, and toxicology. It focuses on how drugs interact
with living systems to produce a biological effect.
2. A drug that binds to a receptor and produces a maximal response is called a:
A) Antagonist
B) Partial agonist
C) Agonist
D) Competitive inhibitor
Correct Answer: C
Rationale: An agonist is a drug that binds to a receptor and activates it, producing a biological response.
A full agonist produces the maximal possible effect, while a partial agonist produces a weaker response.
Antagonists block the receptor without activating it.
,3. Which route of drug administration undergoes the first-pass effect?
A) Intravenous
B) Sublingual
C) Oral
D) Transdermal
Correct Answer: C
Rationale: The first-pass effect refers to the liver's metabolism of a drug before it reaches systemic
circulation. Orally administered drugs are absorbed from the GI tract and travel to the liver via the portal
vein, where they may be extensively metabolized. Other routes bypass the portal circulation and avoid
the first-pass effect.
4. A patient asks what "half-life" means. The nurse explains that half-life is the time it takes for:
A) A drug to reach its peak concentration in the blood
B) The body to eliminate half of the drug's concentration
C) A drug to cause half of its therapeutic effect
D) The drug to be absorbed into the bloodstream
Correct Answer: B
Rationale: Half-life is defined as the time required for the plasma concentration of a drug to decrease by
50% (to be reduced by half). It is a key pharmacokinetic parameter that determines dosing frequency
and time to reach steady state (typically 4–5 half-lives).
5. Which term describes the process by which a drug moves from the administration site into the
bloodstream?
A) Distribution
B) Metabolism
,C) Absorption
D) Excretion
Correct Answer: C
Rationale: Absorption is the movement of a drug from its site of administration into the systemic
circulation. It is the first pharmacokinetic phase; factors such as route of administration, solubility, and
blood flow influence absorption rate and extent.
6. What is the most important responsibility of a nurse regarding medication administration?
A) Memorizing all drug names and doses
B) Ensuring the right drug, right dose, right patient, right route, and right time (Five Rights)
C) Administering all medications as fast as possible
D) Delegating medication administration to unlicensed personnel
Correct Answer: B
Rationale: The "Five Rights" (right patient, right drug, right dose, right route, right time) are the
foundation of safe medication administration. Additional rights include right documentation, right
indication, right to refuse, and right assessment. Adherence to these principles reduces medication
errors and enhances patient safety.
7. A nurse is preparing to administer digoxin. Which assessment finding would require the nurse to hold
the medication and contact the healthcare provider?
A) Heart rate of 58 beats/minute in an adult
B) Blood pressure of 130/80 mmHg
C) Respiratory rate of 18 breaths/minute
D) Serum potassium of 4.2 mEq/L
, Correct Answer: A
Rationale: Digoxin slows the heart rate and can cause bradycardia. For an adult, a heart rate below 60
beats/minute is a common parameter for holding digoxin. Hypokalemia increases the risk of digoxin
toxicity, but a potassium of 4.2 mEq/L is within normal limits.
8. A patient is prescribed warfarin. Which laboratory value should the nurse monitor to assess
therapeutic effect?
A) aPTT
B) INR
C) Platelet count
D) Bleeding time
Correct Answer: B
Rationale: Warfarin is an anticoagulant that inhibits vitamin K-dependent clotting factors (II, VII, IX, X).
Its therapeutic effect is monitored using the International Normalized Ratio (INR). The target INR
depends on the indication (e.g., 2–3 for atrial fibrillation). aPTT monitors heparin.
9. A patient is prescribed furosemide (Lasix). Which electrolyte imbalance is a common adverse effect?
A) Hyperkalemia
B) Hypokalemia
C) Hypernatremia
D) Hypercalcemia
Correct Answer: B
Rationale: Furosemide is a loop diuretic that inhibits sodium and chloride reabsorption in the thick
ascending loop of Henle. It causes increased excretion of potassium and magnesium, leading to
hypokalemia. Monitoring serum electrolytes and providing potassium supplementation or a potassium-
sparing diuretic may be necessary.
