NU578 Exam 1: Pharmacokinetics, Pharmacodynamics & Basic Prescribing
Principles Practice Questions with Detailed Rationales
This comprehensive study guide covers the core domains tested on NU578 Exam 1 at the
University of South Alabama, aligned with the 2026–2027 curriculum. It includes original
practice questions with detailed rationales, organized by topic: Pharmacokinetics (ADME),
Pharmacodynamics (Receptor Theory & Dose-Response), Drug Metabolism & Interactions,
and Basic Prescribing Principles.
Pharmacokinetics and pharmacodynamics form the foundational bedrock of advanced
pharmacology practice. The exam tests your ability to apply these principles to clinical decision-
making, including drug selection, dosing, monitoring, and patient education across the lifespan.
Section 1: Pharmacokinetics – Absorption
Q1. Define pharmacokinetics.
A) The impact of drugs on the body – the nature and intensity
of the response
B) The impact of the body on drugs – how much of an
administered dose reaches its sites of action
C) The study of drug interactions with receptors
D) The process of drug excretion from the body
Answer: B
Rationale: Pharmacokinetics is the study of what the body does
to a drug, encompassing the processes of absorption,
distribution, metabolism, and excretion (ADME) that determine
how much of an administered dose reaches its sites of action.
Pharmacodynamics, by contrast, is the study of what the drug
does to the body.
,Q2. Which pharmacokinetic process is primarily affected by the
"first-pass effect"?
A) Excretion
B) Distribution
C) Absorption
D) Metabolism
Answer: D
Rationale: The first-pass effect refers to the rapid hepatic
metabolism of a drug absorbed from the GI tract before it
reaches systemic circulation. Drugs with high first-pass
metabolism have significantly reduced bioavailability when
administered orally.
Q3. A nurse is preparing to administer an oral medication that
undergoes extensive first-pass metabolism. Which route would
the nurse expect the prescriber to order to bypass this effect?
A) Oral
B) Sublingual
C) Rectal
D) Intravenous
Answer: D
Rationale: First-pass effect refers to rapid hepatic inactivation of
certain oral drugs as they pass through the gut wall and liver via
the portal circulation. IV administration bypasses the hepatic
,portal system entirely, allowing the drug to reach systemic
circulation before hepatic metabolism.
Q4. A patient with liver cirrhosis is prescribed a drug with high
first-pass metabolism. The NP anticipates:
A) Increased bioavailability
B) Decreased bioavailability
C) No change in drug effect
D) Faster drug excretion
Answer: A
Rationale: Liver disease reduces first-pass metabolism, leaving
more active drug to reach systemic circulation, thus increasing
bioavailability. This places the patient at risk for drug toxicity,
and dose reduction is often required.
Q5. Which patient condition would the APRN recognize as
having the potential to DECREASE drug absorption from the
intramuscular (IM) route?
A) Fever
B) Increased cardiac output
C) Shock or decreased tissue perfusion
D) Exercise
Answer: C
Rationale: Decreased blood flow to tissues (as seen in shock,
heart failure, or peripheral vascular disease) reduces drug
, absorption from IM sites. Fever and increased cardiac output
would increase absorption.
Q6. What is the primary mechanism by which most drugs cross
cell membranes?
A) Active transport
B) Passive diffusion
C) Pinocytosis
D) Facilitated diffusion
Answer: B
Rationale: Passive diffusion is the most common mechanism for
drug absorption. It requires no energy and depends on the
drug's lipid solubility and concentration gradient. Most drugs
are weak acids or bases that cross membranes in their non-
ionized form.
Q7. 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 first-pass metabolism
D) Food prevents drug-protein binding
Answer: B
Rationale: Food in the stomach slows gastric emptying,
delaying drug delivery to the small intestine where most
absorption occurs. For drugs that require rapid onset or are
Principles Practice Questions with Detailed Rationales
This comprehensive study guide covers the core domains tested on NU578 Exam 1 at the
University of South Alabama, aligned with the 2026–2027 curriculum. It includes original
practice questions with detailed rationales, organized by topic: Pharmacokinetics (ADME),
Pharmacodynamics (Receptor Theory & Dose-Response), Drug Metabolism & Interactions,
and Basic Prescribing Principles.
Pharmacokinetics and pharmacodynamics form the foundational bedrock of advanced
pharmacology practice. The exam tests your ability to apply these principles to clinical decision-
making, including drug selection, dosing, monitoring, and patient education across the lifespan.
Section 1: Pharmacokinetics – Absorption
Q1. Define pharmacokinetics.
A) The impact of drugs on the body – the nature and intensity
of the response
B) The impact of the body on drugs – how much of an
administered dose reaches its sites of action
C) The study of drug interactions with receptors
D) The process of drug excretion from the body
Answer: B
Rationale: Pharmacokinetics is the study of what the body does
to a drug, encompassing the processes of absorption,
distribution, metabolism, and excretion (ADME) that determine
how much of an administered dose reaches its sites of action.
Pharmacodynamics, by contrast, is the study of what the drug
does to the body.
,Q2. Which pharmacokinetic process is primarily affected by the
"first-pass effect"?
A) Excretion
B) Distribution
C) Absorption
D) Metabolism
Answer: D
Rationale: The first-pass effect refers to the rapid hepatic
metabolism of a drug absorbed from the GI tract before it
reaches systemic circulation. Drugs with high first-pass
metabolism have significantly reduced bioavailability when
administered orally.
Q3. A nurse is preparing to administer an oral medication that
undergoes extensive first-pass metabolism. Which route would
the nurse expect the prescriber to order to bypass this effect?
A) Oral
B) Sublingual
C) Rectal
D) Intravenous
Answer: D
Rationale: First-pass effect refers to rapid hepatic inactivation of
certain oral drugs as they pass through the gut wall and liver via
the portal circulation. IV administration bypasses the hepatic
,portal system entirely, allowing the drug to reach systemic
circulation before hepatic metabolism.
Q4. A patient with liver cirrhosis is prescribed a drug with high
first-pass metabolism. The NP anticipates:
A) Increased bioavailability
B) Decreased bioavailability
C) No change in drug effect
D) Faster drug excretion
Answer: A
Rationale: Liver disease reduces first-pass metabolism, leaving
more active drug to reach systemic circulation, thus increasing
bioavailability. This places the patient at risk for drug toxicity,
and dose reduction is often required.
Q5. Which patient condition would the APRN recognize as
having the potential to DECREASE drug absorption from the
intramuscular (IM) route?
A) Fever
B) Increased cardiac output
C) Shock or decreased tissue perfusion
D) Exercise
Answer: C
Rationale: Decreased blood flow to tissues (as seen in shock,
heart failure, or peripheral vascular disease) reduces drug
, absorption from IM sites. Fever and increased cardiac output
would increase absorption.
Q6. What is the primary mechanism by which most drugs cross
cell membranes?
A) Active transport
B) Passive diffusion
C) Pinocytosis
D) Facilitated diffusion
Answer: B
Rationale: Passive diffusion is the most common mechanism for
drug absorption. It requires no energy and depends on the
drug's lipid solubility and concentration gradient. Most drugs
are weak acids or bases that cross membranes in their non-
ionized form.
Q7. 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 first-pass metabolism
D) Food prevents drug-protein binding
Answer: B
Rationale: Food in the stomach slows gastric emptying,
delaying drug delivery to the small intestine where most
absorption occurs. For drugs that require rapid onset or are
