Module 1: Foundational Principles & General
Pharmacology
50 High-Yield MSN/NP-Level Prac ce Ques ons
Ques on 1 — Pharmacokine cs: Oral Absorp on
A 64-year-old pa ent with hypertension is prescribed an oral medica on that is primarily
absorbed in the small intes ne. The pa ent has recently undergone a surgical procedure that
markedly accelerates gastrointes nal transit. Which pharmacokine c change is the nurse
prac oner most likely to an cipate?
A. Increased renal elimina on of the medica on
B. Reduced systemic absorp on of the medica on
C. Increased plasma protein binding
D. Reduced hepa c metabolism
Correct Answer: B
Clinical Ra onale
The correct answer is B. Reduced systemic absorp on of the medica on. For an orally
administered drug, absorp on depends in part on the me available for dissolu on and
transport across the gastrointes nal epithelium. Rapid intes nal transit can shorten contact
me and decrease the frac on of the dose reaching the systemic circula on, poten ally
lowering the drug's bioavailability and therapeu c effect.
A. Increased renal elimina on is incorrect because renal clearance primarily determines
drug removal a er the drug has entered systemic circula on. Accelerated
gastrointes nal transit is an absorp on issue, not a direct renal clearance mechanism.
, C. Increased plasma protein binding is incorrect because protein binding occurs a er
systemic absorp on. It is not a predictable consequence of rapid gastrointes nal transit.
D. Reduced hepa c metabolism is incorrect because hepa c biotransforma on occurs
a er systemic exposure and is governed by hepa c blood flow, enzyme ac vity, and
intrinsic clearance rather than intes nal transit alone.
Key Concept: Changes in gastrointes nal physiology can alter the absorp on phase of ADME
without directly changing distribu on, metabolism, or elimina on.
Ques on 2 — Pharmacokine cs: Passive Diffusion
A drug is highly lipophilic, nonionized at physiologic pH, and administered enterally. Which
mechanism is most responsible for movement of this drug across biologic membranes?
A. Ac ve transport requiring ATP
B. Facilitated diffusion through a membrane transporter
C. Passive diffusion through the lipid bilayer
D. Endocytosis mediated by membrane receptors
Correct Answer: C
Clinical Ra onale
The correct answer is C. Passive diffusion through the lipid bilayer. Highly lipid-soluble,
nonionized molecules readily cross cell membranes by passive diffusion. This process does not
require cellular energy or a specific transporter and generally moves a drug down its
concentra on gradient.
A. Ac ve transport is incorrect because ac ve transport requires an energy-dependent
transport system and is not necessary for a sufficiently lipophilic, nonionized molecule.
, B. Facilitated diffusion is incorrect because although it does not directly require ATP, it
requires a membrane carrier. The described drug has characteris cs favoring simple
membrane diffusion.
D. Endocytosis is incorrect because this mechanism is generally used for large molecules
or par culate material rather than typical small lipophilic medica ons.
Key Concept: Lipid solubility and degree of ioniza on are major determinants of membrane
permeability.
Ques on 3 — First-Pass Effect
A pa ent receives a medica on orally and experiences a weaker-than-expected clinical response
despite taking the prescribed dose correctly. The medica on undergoes extensive first-pass
hepa c metabolism. Which explana on is most accurate?
A. The medica on is being eliminated predominantly through the lungs
B. A substan al frac on of the absorbed dose is metabolized before reaching systemic
circula on
C. The medica on is unable to bind to plasma proteins
D. The medica on is completely prevented from entering the intes nal circula on
Correct Answer: B
Clinical Ra onale
The correct answer is B. A substan al frac on of the absorbed dose is metabolized before
reaching systemic circula on. A er oral absorp on, many drugs enter the portal circula on and
pass through the liver before reaching the systemic circula on. Extensive hepa c metabolism
during this first pass can substan ally reduce bioavailability.
A. Pulmonary elimina on is not the defining mechanism of first-pass metabolism.
Although some vola le substances can undergo pulmonary elimina on, that is unrelated
to the described phenomenon.
, C. Failure of plasma protein binding does not explain first-pass metabolism. Protein
binding occurs primarily in the circula on and affects distribu on and free-drug
concentra on.
D. Complete preven on of intes nal entry is incorrect. The drug is absorbed into the
portal circula on; the issue is metabolism a er absorp on and before systemic
circula on.
Key Concept: Oral bioavailability can be significantly reduced by presystemic hepa c
metabolism.
Ques on 4 — Bioavailability and Route
A pa ent with severe vomi ng is unable to retain oral medica ons and requires rapid
therapeu c drug exposure. Which route would most reliably bypass gastrointes nal absorp on
and most first-pass hepa c metabolism?
A. Sublingual
B. Oral
C. Enteral feeding tube
D. Rectal administra on
Correct Answer: A
Clinical Ra onale
The correct answer is A. Sublingual. Sublingual administra on permits drug absorp on directly
through oral mucosa into systemic circula on, generally avoiding gastrointes nal degrada on
and substan ally bypassing first-pass hepa c metabolism. It can also produce rela vely rapid
onset.
B. Oral is inappropriate because ac ve vomi ng can prevent adequate absorp on and
may delay or eliminate the intended dose.
Pharmacology
50 High-Yield MSN/NP-Level Prac ce Ques ons
Ques on 1 — Pharmacokine cs: Oral Absorp on
A 64-year-old pa ent with hypertension is prescribed an oral medica on that is primarily
absorbed in the small intes ne. The pa ent has recently undergone a surgical procedure that
markedly accelerates gastrointes nal transit. Which pharmacokine c change is the nurse
prac oner most likely to an cipate?
A. Increased renal elimina on of the medica on
B. Reduced systemic absorp on of the medica on
C. Increased plasma protein binding
D. Reduced hepa c metabolism
Correct Answer: B
Clinical Ra onale
The correct answer is B. Reduced systemic absorp on of the medica on. For an orally
administered drug, absorp on depends in part on the me available for dissolu on and
transport across the gastrointes nal epithelium. Rapid intes nal transit can shorten contact
me and decrease the frac on of the dose reaching the systemic circula on, poten ally
lowering the drug's bioavailability and therapeu c effect.
A. Increased renal elimina on is incorrect because renal clearance primarily determines
drug removal a er the drug has entered systemic circula on. Accelerated
gastrointes nal transit is an absorp on issue, not a direct renal clearance mechanism.
, C. Increased plasma protein binding is incorrect because protein binding occurs a er
systemic absorp on. It is not a predictable consequence of rapid gastrointes nal transit.
D. Reduced hepa c metabolism is incorrect because hepa c biotransforma on occurs
a er systemic exposure and is governed by hepa c blood flow, enzyme ac vity, and
intrinsic clearance rather than intes nal transit alone.
Key Concept: Changes in gastrointes nal physiology can alter the absorp on phase of ADME
without directly changing distribu on, metabolism, or elimina on.
Ques on 2 — Pharmacokine cs: Passive Diffusion
A drug is highly lipophilic, nonionized at physiologic pH, and administered enterally. Which
mechanism is most responsible for movement of this drug across biologic membranes?
A. Ac ve transport requiring ATP
B. Facilitated diffusion through a membrane transporter
C. Passive diffusion through the lipid bilayer
D. Endocytosis mediated by membrane receptors
Correct Answer: C
Clinical Ra onale
The correct answer is C. Passive diffusion through the lipid bilayer. Highly lipid-soluble,
nonionized molecules readily cross cell membranes by passive diffusion. This process does not
require cellular energy or a specific transporter and generally moves a drug down its
concentra on gradient.
A. Ac ve transport is incorrect because ac ve transport requires an energy-dependent
transport system and is not necessary for a sufficiently lipophilic, nonionized molecule.
, B. Facilitated diffusion is incorrect because although it does not directly require ATP, it
requires a membrane carrier. The described drug has characteris cs favoring simple
membrane diffusion.
D. Endocytosis is incorrect because this mechanism is generally used for large molecules
or par culate material rather than typical small lipophilic medica ons.
Key Concept: Lipid solubility and degree of ioniza on are major determinants of membrane
permeability.
Ques on 3 — First-Pass Effect
A pa ent receives a medica on orally and experiences a weaker-than-expected clinical response
despite taking the prescribed dose correctly. The medica on undergoes extensive first-pass
hepa c metabolism. Which explana on is most accurate?
A. The medica on is being eliminated predominantly through the lungs
B. A substan al frac on of the absorbed dose is metabolized before reaching systemic
circula on
C. The medica on is unable to bind to plasma proteins
D. The medica on is completely prevented from entering the intes nal circula on
Correct Answer: B
Clinical Ra onale
The correct answer is B. A substan al frac on of the absorbed dose is metabolized before
reaching systemic circula on. A er oral absorp on, many drugs enter the portal circula on and
pass through the liver before reaching the systemic circula on. Extensive hepa c metabolism
during this first pass can substan ally reduce bioavailability.
A. Pulmonary elimina on is not the defining mechanism of first-pass metabolism.
Although some vola le substances can undergo pulmonary elimina on, that is unrelated
to the described phenomenon.
, C. Failure of plasma protein binding does not explain first-pass metabolism. Protein
binding occurs primarily in the circula on and affects distribu on and free-drug
concentra on.
D. Complete preven on of intes nal entry is incorrect. The drug is absorbed into the
portal circula on; the issue is metabolism a er absorp on and before systemic
circula on.
Key Concept: Oral bioavailability can be significantly reduced by presystemic hepa c
metabolism.
Ques on 4 — Bioavailability and Route
A pa ent with severe vomi ng is unable to retain oral medica ons and requires rapid
therapeu c drug exposure. Which route would most reliably bypass gastrointes nal absorp on
and most first-pass hepa c metabolism?
A. Sublingual
B. Oral
C. Enteral feeding tube
D. Rectal administra on
Correct Answer: A
Clinical Ra onale
The correct answer is A. Sublingual. Sublingual administra on permits drug absorp on directly
through oral mucosa into systemic circula on, generally avoiding gastrointes nal degrada on
and substan ally bypassing first-pass hepa c metabolism. It can also produce rela vely rapid
onset.
B. Oral is inappropriate because ac ve vomi ng can prevent adequate absorp on and
may delay or eliminate the intended dose.
