ATI PN Pharmacology Proctored Exam 2026 | 100-
Question Practice Exam with Answers & Detailed
Rationales | ATI PN Pharmacology Study Guide,
Practical Nursing Exam Prep, Test Review & High-
Yield Medication Concepts
Section 1: Pharmacokinetics & Pharmacodynamics (Questions 1–10)
1. A client who has been taking oral nitroglycerin tablets for stable angina asks the
practical nurse why the sublingual form works faster than the tablets swallowed with
water. Which explanation by the nurse is accurate?
A. "Sublingual medication passes through the liver twice before reaching the heart."
B. "Saliva activates the drug and increases its absorption in the stomach."
C. "Sublingual absorption bypasses hepatic first-pass metabolism, so more drug
reaches the systemic circulation."
D. "Oral nitroglycerin is destroyed by gastric acid and produces no therapeutic effect."
Answer: C
Rationale: Sublingual nitroglycerin is absorbed directly through the rich capillary
network of the oral mucosa into the systemic circulation, bypassing the portal vein and
hepatic first-pass inactivation that greatly reduces the bioavailability of orally
swallowed doses . Option A reverses the concept. Options B and D are incorrect
because saliva does not activate the drug, and oral nitroglycerin does have effect, only
at a much higher processed dose .
2. A client who takes warfarin, a highly protein-bound anticoagulant, is newly
prescribed a second medication that is also highly protein bound. Which nursing
intervention is the priority based on the expected pharmacokinetic interaction?
A. Monitor the client closely for bleeding such as bruising, gum bleeding, and dark tarry
stools.
,B. Teach the client that the anticoagulant effect of warfarin will be decreased.
C. Explain that protein-bound drugs never interact with one another.
D. Encourage additional protein intake to bind both medications completely.
Answer: A
Rationale: Two highly protein-bound drugs compete for binding sites, displacing
warfarin and raising the level of free, active drug, which increases the risk of bleeding .
The nurse should therefore monitor for bleeding, not for a weakened effect as in option
B. Options C and D are incorrect because competition for protein sites is a well-
established interaction, and dietary protein cannot redirect this pharmacokinetic
mechanism .
3. A client begins an oral antibiotic that has a half-life of 8 hours and will take it every 8
hours. The nurse should instruct the client that steady-state serum concentration of the
drug will generally be reached in approximately how long?
A. 16 hours
B. 32 to 40 hours
C. 24 hours
D. 72 hours
Answer: B
Rationale: Steady state is reached after about 4 to 5 half-lives of consistent dosing
regardless of dose size, so a drug with an 8-hour half-life reaches steady state in
roughly 32 to 40 hours . Option A represents only 2 half-lives and option C only 3 half-
lives, when drug levels would still be climbing. Option D unnecessarily extends therapy
monitoring far beyond the accepted window .
4. Before administering the morning dose of digoxin, the nurse reviews the client's
serum digoxin level, which is 2.6 ng/mL, and notes the client reports nausea and is
seeing yellow-green halos around lights. Which action should the nurse take?
A. Administer the dose as prescribed because nausea is an expected effect.
B. Give the dose with an antacid to reduce gastric irritation.
,C. Double the next scheduled dose to maintain therapeutic levels.
D. Withhold the dose and notify the provider of the findings.
Answer: D
Rationale: The therapeutic range for digoxin is approximately 0.5 to 2.0 ng/mL. A level
of 2.6 ng/mL indicates toxicity, and the client's symptoms of nausea and visual
disturbances (yellow-green halos) are classic signs of digoxin toxicity. The nurse should
withhold the dose and notify the provider immediately .
5. A nurse is providing teaching to a client about the pharmacokinetics of a newly
prescribed medication. Which statement correctly describes the term "absorption"?
A. The process by which a drug is transported throughout the body.
B. The process by which a drug moves from the site of administration into the
bloodstream.
C. The process by which a drug is chemically altered by the liver.
D. The process by which a drug is eliminated from the body.
Answer: B
Rationale: Absorption is the movement of a drug from its site of administration into the
bloodstream. Distribution transports the drug throughout the body, metabolism
chemically alters it, and excretion eliminates it .
6. A client asks why a medication must be taken on an empty stomach. Which
explanation by the nurse is most accurate?
A. "Food has no effect on medication absorption."
B. "Certain medications require an empty stomach for optimal absorption, since food
can delay or reduce absorption."
C. "All medications must always be taken with food."
D. "This instruction is only a general preference."
Answer: B
, Rationale: Food can alter gastric pH, motility, and binding, affecting absorption of
certain medications. Some medications require an empty stomach for optimal
absorption, while others should be taken with food to reduce GI upset .
7. A nurse is teaching a client about a sustained-release medication. Which instruction
should the nurse include?
A. "Chew the tablet for faster absorption."
B. "Swallow the tablet whole; do not crush or chew."
C. "Take with grapefruit juice for better absorption."
D. "Dissolve the tablet in water before taking."
Answer: B
Rationale: Sustained-release (SR, ER, XL, LA) medications should NEVER be crushed or
chewed because doing so releases the entire dose at once, risking toxicity .
8. A practical nurse is preparing to administer phenobarbital to a client who has a
seizure disorder. The medication has a long half-life of 4 days. How many times per day
should the nurse expect to administer this medication?
A. One
B. Two
C. Three
D. Four
Answer: A
Rationale: Medications with long half-lives remain at their therapeutic levels between
doses for long periods of time. The nurse should expect to administer this medication
once per day .
9. A nurse is caring for a client who is receiving intravenous therapy. The nurse should
identify which finding as a manifestation of fluid volume excess?
Question Practice Exam with Answers & Detailed
Rationales | ATI PN Pharmacology Study Guide,
Practical Nursing Exam Prep, Test Review & High-
Yield Medication Concepts
Section 1: Pharmacokinetics & Pharmacodynamics (Questions 1–10)
1. A client who has been taking oral nitroglycerin tablets for stable angina asks the
practical nurse why the sublingual form works faster than the tablets swallowed with
water. Which explanation by the nurse is accurate?
A. "Sublingual medication passes through the liver twice before reaching the heart."
B. "Saliva activates the drug and increases its absorption in the stomach."
C. "Sublingual absorption bypasses hepatic first-pass metabolism, so more drug
reaches the systemic circulation."
D. "Oral nitroglycerin is destroyed by gastric acid and produces no therapeutic effect."
Answer: C
Rationale: Sublingual nitroglycerin is absorbed directly through the rich capillary
network of the oral mucosa into the systemic circulation, bypassing the portal vein and
hepatic first-pass inactivation that greatly reduces the bioavailability of orally
swallowed doses . Option A reverses the concept. Options B and D are incorrect
because saliva does not activate the drug, and oral nitroglycerin does have effect, only
at a much higher processed dose .
2. A client who takes warfarin, a highly protein-bound anticoagulant, is newly
prescribed a second medication that is also highly protein bound. Which nursing
intervention is the priority based on the expected pharmacokinetic interaction?
A. Monitor the client closely for bleeding such as bruising, gum bleeding, and dark tarry
stools.
,B. Teach the client that the anticoagulant effect of warfarin will be decreased.
C. Explain that protein-bound drugs never interact with one another.
D. Encourage additional protein intake to bind both medications completely.
Answer: A
Rationale: Two highly protein-bound drugs compete for binding sites, displacing
warfarin and raising the level of free, active drug, which increases the risk of bleeding .
The nurse should therefore monitor for bleeding, not for a weakened effect as in option
B. Options C and D are incorrect because competition for protein sites is a well-
established interaction, and dietary protein cannot redirect this pharmacokinetic
mechanism .
3. A client begins an oral antibiotic that has a half-life of 8 hours and will take it every 8
hours. The nurse should instruct the client that steady-state serum concentration of the
drug will generally be reached in approximately how long?
A. 16 hours
B. 32 to 40 hours
C. 24 hours
D. 72 hours
Answer: B
Rationale: Steady state is reached after about 4 to 5 half-lives of consistent dosing
regardless of dose size, so a drug with an 8-hour half-life reaches steady state in
roughly 32 to 40 hours . Option A represents only 2 half-lives and option C only 3 half-
lives, when drug levels would still be climbing. Option D unnecessarily extends therapy
monitoring far beyond the accepted window .
4. Before administering the morning dose of digoxin, the nurse reviews the client's
serum digoxin level, which is 2.6 ng/mL, and notes the client reports nausea and is
seeing yellow-green halos around lights. Which action should the nurse take?
A. Administer the dose as prescribed because nausea is an expected effect.
B. Give the dose with an antacid to reduce gastric irritation.
,C. Double the next scheduled dose to maintain therapeutic levels.
D. Withhold the dose and notify the provider of the findings.
Answer: D
Rationale: The therapeutic range for digoxin is approximately 0.5 to 2.0 ng/mL. A level
of 2.6 ng/mL indicates toxicity, and the client's symptoms of nausea and visual
disturbances (yellow-green halos) are classic signs of digoxin toxicity. The nurse should
withhold the dose and notify the provider immediately .
5. A nurse is providing teaching to a client about the pharmacokinetics of a newly
prescribed medication. Which statement correctly describes the term "absorption"?
A. The process by which a drug is transported throughout the body.
B. The process by which a drug moves from the site of administration into the
bloodstream.
C. The process by which a drug is chemically altered by the liver.
D. The process by which a drug is eliminated from the body.
Answer: B
Rationale: Absorption is the movement of a drug from its site of administration into the
bloodstream. Distribution transports the drug throughout the body, metabolism
chemically alters it, and excretion eliminates it .
6. A client asks why a medication must be taken on an empty stomach. Which
explanation by the nurse is most accurate?
A. "Food has no effect on medication absorption."
B. "Certain medications require an empty stomach for optimal absorption, since food
can delay or reduce absorption."
C. "All medications must always be taken with food."
D. "This instruction is only a general preference."
Answer: B
, Rationale: Food can alter gastric pH, motility, and binding, affecting absorption of
certain medications. Some medications require an empty stomach for optimal
absorption, while others should be taken with food to reduce GI upset .
7. A nurse is teaching a client about a sustained-release medication. Which instruction
should the nurse include?
A. "Chew the tablet for faster absorption."
B. "Swallow the tablet whole; do not crush or chew."
C. "Take with grapefruit juice for better absorption."
D. "Dissolve the tablet in water before taking."
Answer: B
Rationale: Sustained-release (SR, ER, XL, LA) medications should NEVER be crushed or
chewed because doing so releases the entire dose at once, risking toxicity .
8. A practical nurse is preparing to administer phenobarbital to a client who has a
seizure disorder. The medication has a long half-life of 4 days. How many times per day
should the nurse expect to administer this medication?
A. One
B. Two
C. Three
D. Four
Answer: A
Rationale: Medications with long half-lives remain at their therapeutic levels between
doses for long periods of time. The nurse should expect to administer this medication
once per day .
9. A nurse is caring for a client who is receiving intravenous therapy. The nurse should
identify which finding as a manifestation of fluid volume excess?
