NU 578 Units 1–5 Exam | Latest Update 2026/2027 | 200
Practice Questions & Detailed Answers | Pharmacology for
Advanced Practice Nurses | A+ Graded
UNIT 1: PHARMACOKINETICS & PHARMACODYNAMICS (Questions 1–50)
1. Which property of an ideal drug refers to its ability to elicit only the response for which it is given?
A) Effectiveness
B) Safety
C) Selectivity
D) Reversible action
E) Predictability
Answer: C) Selectivity
Rationale: Selectivity is the ability of a drug to produce only the desired therapeutic effect without
affecting other body systems. No drug is completely selective, but higher selectivity reduces adverse
effects.
2. Pharmacokinetics is best defined as:
A) The study of how drugs produce their effects on the body
B) The study of drug absorption, distribution, metabolism, and excretion
C) The study of drugreceptor interactions
D) The study of drug toxicity and adverse effects
E) The study of drug manufacturing processes
Answer: B) The study of drug absorption, distribution, metabolism, and excretion
,Rationale: Pharmacokinetics describes what the body does to the drug—specifically the processes of
absorption, distribution, metabolism, and excretion (ADME).
3. Pharmacodynamics is best defined as:
A) The study of drug absorption and distribution
B) The study of what the drug does to the body
C) The study of drug metabolism and excretion
D) The process of drug excretion from the body
E) The study of drug interactions with food
Answer: B) The study of what the drug does to the body
Rationale: Pharmacodynamics describes the biochemical and physiological effects of drugs on the body,
including drugreceptor interactions and mechanisms of action.
4. A patient asks why they must take a medication on an empty stomach. Which of the following is the
best explanation?
A) Food increases drug absorption in all cases
B) Food in the stomach slows drug absorption
C) Food enhances firstpass metabolism
D) Food prevents drugprotein binding
E) Food increases renal excretion of drugs
Answer: B) Food in the stomach slows drug absorption
,Rationale: The presence of food in the stomach delays gastric emptying and slows the rate of drug
absorption. The "empty stomach" rule typically means taking medication 2 hours before or after eating.
5. Which of the following statements best describes the role of cytochrome P450 (CYP450) enzymes in
drug metabolism?
A) CYP450 enzymes are located primarily in the kidneys
B) CYP450 enzymes metabolize all drugs through the same pathway
C) CYP450 enzymes are a family of enzymes that metabolize drugs and are subject to induction and
inhibition
D) CYP450 enzymes are not affected by genetic variations
E) CYP450 enzymes are located primarily in the plasma
Answer: C) CYP450 enzymes are a family of enzymes that metabolize drugs and are subject to induction
and inhibition
Rationale: CYP450 enzymes are primarily located in the liver and are responsible for metabolizing many
drugs. They can be induced (increasing metabolism) or inhibited (decreasing metabolism) by other
drugs, foods, or genetic factors.
6. A patient is prescribed clopidogrel and omeprazole together. The advanced practice nurse recognizes
this combination may:
A) Increase the antiplatelet effect of clopidogrel
B) Decrease the antiplatelet effect of clopidogrel due to metabolic inacti vation
C) Have no significant drug interaction
D) Increase the risk of gastrointestinal bleeding
E) Increase the absorption of both drugs
, Answer: B) Decrease the antiplatelet effect of clopidogrel due to metabolic inactivation
Rationale: Omeprazole inhibits CYP2C19, the enzyme responsible for activating clopidogrel (a prodrug).
This interaction reduces clopidogrel's antiplatelet efficacy, increasing the risk for thrombotic events.
7. Grapefruit juice interacts with certain drugs by:
A) Increasing drug absorption in the intestines
B) Inhibiting CYP3A4 metabolism in the liver and intestinal wall
C) Inducing CYP3A4 metabolism in the liver
D) Increasing renal excretion of drugs
E) Decreasing protein binding of drugs
Answer: B) Inhibiting CYP3A4 metabolism in the liver and intestinal wall
Rationale: Grapefruit juice inhibits CYP3A4, particularly in the intestinal wall and liver. The inhibition of
gut cells can last up to 3 days after consuming grapefruit juice, raising blood levels of certain drugs and
potentially causing toxicity.
8. Which compounds in grapefruit juice are responsible for its interaction with drug metabolism?
A) Naringin and naringenin only
B) Bergapten and 6',7'dihydroxybergamottin only
C) Two furanocoumarins (bergapten and 6',7'dihydroxybergamottin) and two flavonoids (naringin and
naringenin)
D) Only the flavonoids
E) Only the furanocoumarins
Practice Questions & Detailed Answers | Pharmacology for
Advanced Practice Nurses | A+ Graded
UNIT 1: PHARMACOKINETICS & PHARMACODYNAMICS (Questions 1–50)
1. Which property of an ideal drug refers to its ability to elicit only the response for which it is given?
A) Effectiveness
B) Safety
C) Selectivity
D) Reversible action
E) Predictability
Answer: C) Selectivity
Rationale: Selectivity is the ability of a drug to produce only the desired therapeutic effect without
affecting other body systems. No drug is completely selective, but higher selectivity reduces adverse
effects.
2. Pharmacokinetics is best defined as:
A) The study of how drugs produce their effects on the body
B) The study of drug absorption, distribution, metabolism, and excretion
C) The study of drugreceptor interactions
D) The study of drug toxicity and adverse effects
E) The study of drug manufacturing processes
Answer: B) The study of drug absorption, distribution, metabolism, and excretion
,Rationale: Pharmacokinetics describes what the body does to the drug—specifically the processes of
absorption, distribution, metabolism, and excretion (ADME).
3. Pharmacodynamics is best defined as:
A) The study of drug absorption and distribution
B) The study of what the drug does to the body
C) The study of drug metabolism and excretion
D) The process of drug excretion from the body
E) The study of drug interactions with food
Answer: B) The study of what the drug does to the body
Rationale: Pharmacodynamics describes the biochemical and physiological effects of drugs on the body,
including drugreceptor interactions and mechanisms of action.
4. A patient asks why they must take a medication on an empty stomach. Which of the following is the
best explanation?
A) Food increases drug absorption in all cases
B) Food in the stomach slows drug absorption
C) Food enhances firstpass metabolism
D) Food prevents drugprotein binding
E) Food increases renal excretion of drugs
Answer: B) Food in the stomach slows drug absorption
,Rationale: The presence of food in the stomach delays gastric emptying and slows the rate of drug
absorption. The "empty stomach" rule typically means taking medication 2 hours before or after eating.
5. Which of the following statements best describes the role of cytochrome P450 (CYP450) enzymes in
drug metabolism?
A) CYP450 enzymes are located primarily in the kidneys
B) CYP450 enzymes metabolize all drugs through the same pathway
C) CYP450 enzymes are a family of enzymes that metabolize drugs and are subject to induction and
inhibition
D) CYP450 enzymes are not affected by genetic variations
E) CYP450 enzymes are located primarily in the plasma
Answer: C) CYP450 enzymes are a family of enzymes that metabolize drugs and are subject to induction
and inhibition
Rationale: CYP450 enzymes are primarily located in the liver and are responsible for metabolizing many
drugs. They can be induced (increasing metabolism) or inhibited (decreasing metabolism) by other
drugs, foods, or genetic factors.
6. A patient is prescribed clopidogrel and omeprazole together. The advanced practice nurse recognizes
this combination may:
A) Increase the antiplatelet effect of clopidogrel
B) Decrease the antiplatelet effect of clopidogrel due to metabolic inacti vation
C) Have no significant drug interaction
D) Increase the risk of gastrointestinal bleeding
E) Increase the absorption of both drugs
, Answer: B) Decrease the antiplatelet effect of clopidogrel due to metabolic inactivation
Rationale: Omeprazole inhibits CYP2C19, the enzyme responsible for activating clopidogrel (a prodrug).
This interaction reduces clopidogrel's antiplatelet efficacy, increasing the risk for thrombotic events.
7. Grapefruit juice interacts with certain drugs by:
A) Increasing drug absorption in the intestines
B) Inhibiting CYP3A4 metabolism in the liver and intestinal wall
C) Inducing CYP3A4 metabolism in the liver
D) Increasing renal excretion of drugs
E) Decreasing protein binding of drugs
Answer: B) Inhibiting CYP3A4 metabolism in the liver and intestinal wall
Rationale: Grapefruit juice inhibits CYP3A4, particularly in the intestinal wall and liver. The inhibition of
gut cells can last up to 3 days after consuming grapefruit juice, raising blood levels of certain drugs and
potentially causing toxicity.
8. Which compounds in grapefruit juice are responsible for its interaction with drug metabolism?
A) Naringin and naringenin only
B) Bergapten and 6',7'dihydroxybergamottin only
C) Two furanocoumarins (bergapten and 6',7'dihydroxybergamottin) and two flavonoids (naringin and
naringenin)
D) Only the flavonoids
E) Only the furanocoumarins
