ATI Pharmacology Midterm Exam ACTUAL
EXAM 2026/2027 | ATI Nursing Education
Pharmacology Review | Verified Q&A | Pass
Guaranteed - A+ Graded
Pharmacokinetics & Pharmacodynamics (Questions 1–18)
Q1: A nurse is caring for a patient who has been prescribed digoxin 0.25 mg PO daily for heart failure.
The nurse understands that digoxin has a narrow therapeutic index. Which statement best describes
what this means?
A. The drug is effective at very low doses and has minimal side effects
B. The difference between the therapeutic dose and the toxic dose is small, requiring careful monitoring
C. The drug can be given in a wide range of doses without adverse effects
D. The therapeutic dose is much higher than the toxic dose, making it very safe
Correct Answer: B
Rationale: The best answer is B. A narrow therapeutic index means the range between the dose that
produces the desired effect and the dose that causes toxicity is very small, so frequent monitoring of
serum drug levels and clinical signs is essential. Remember that digoxin, lithium, phenytoin, and warfarin
are all classic examples of drugs with narrow therapeutic windows where small changes in dose or
patient condition can push the patient from therapeutic to toxic.
Q2: A nurse is caring for a patient with liver cirrhosis who is receiving morphine for pain. The nurse
should expect which change in the patient's response to morphine?
A. Decreased drug effect due to impaired protein binding
B. Increased drug effect and prolonged duration due to decreased metabolism
C. No change in drug effect because the liver doesn't metabolize morphine
D. Faster drug elimination due to increased hepatic blood flow
Correct Answer: B
Rationale: The best answer is B. The liver is the primary site of morphine metabolism, and in cirrhosis,
decreased hepatic function leads to slower breakdown of the drug, causing increased effect and longer
duration of action. Remember that patients with liver disease often need lower doses or longer dosing
,intervals for drugs metabolized by the liver, and you need to monitor closely for signs of accumulation
and toxicity like excessive sedation or respiratory depression.
Q3: A nurse is caring for a patient who has been prescribed gentamicin for a severe infection. The
provider orders peak and trough levels. The nurse understands that peak levels are drawn:
A. Immediately before the next scheduled dose
B. 30 minutes after the infusion is completed
C. At the midpoint between doses
D. 24 hours after the first dose is given
Correct Answer: B
Rationale: The best answer is B. Peak levels for aminoglycosides like gentamicin are drawn 30 minutes
after the infusion ends to capture the highest concentration of drug in the bloodstream, which tells you
if the dose is high enough to kill the bacteria. Remember that trough levels are drawn immediately
before the next dose to ensure the drug isn't accumulating to toxic levels, and both are needed to guide
dosing adjustments for these nephrotoxic and ototoxic drugs.
Q4: A nurse is caring for a patient who has been prescribed warfarin following a pulmonary embolism.
The patient asks why they need frequent blood tests. What is the nurse's best explanation?
A. "Warfarin has a wide therapeutic range, so we need to make sure you're getting enough."
B. "Warfarin has a narrow therapeutic index, and your INR needs to stay in a specific range to prevent
clotting or bleeding."
C. "The blood tests check for infection since warfarin suppresses your immune system."
D. "We need to monitor your kidney function because warfarin is toxic to the kidneys."
Correct Answer: B
Rationale: The best answer is B. Warfarin has a narrow therapeutic index, meaning the difference
between an effective dose and a dangerous dose is small, so INR monitoring ensures the patient is
anticoagulated enough to prevent clots but not so much that they bleed. Remember that the
therapeutic INR for most conditions is 2.0–3.0, and values above 4.0 significantly increase bleeding risk
while values below 1.5 may not provide adequate protection against clots.
Q5: A nurse is caring for a patient who is taking phenytoin for seizure control. The patient's most recent
phenytoin level is 8 mcg/mL (therapeutic range 10–20 mcg/mL). The patient has had two breakthrough
seizures in the past week. What is the nurse's best action?
A. Continue the current dose and reassure the patient that levels will improve
B. Hold the next dose and notify the provider of the subtherapeutic level
C. Increase the dose independently to bring the level into range
, D. Document the level and schedule the next dose as ordered
Correct Answer: B
Rationale: The best answer is B. A phenytoin level of 8 mcg/mL is below the therapeutic range of 10–20,
which explains the breakthrough seizures, and the provider needs to be notified to adjust the dose.
Remember that you never independently increase anticonvulsant doses because rapid changes can
cause toxicity or worsen seizure control; the provider will likely increase the dose gradually and recheck
the level.
Q6: A nurse is caring for a patient with renal failure who is receiving vancomycin for MRSA. The nurse
understands that vancomycin dosing must be adjusted based on which pharmacokinetic parameter?
A. Absorption rate in the gastrointestinal tract
B. Creatinine clearance and glomerular filtration rate
C. Hepatic enzyme activity
D. Protein binding in the plasma
Correct Answer: B
Rationale: The best answer is B. Vancomycin is eliminated primarily by the kidneys, so in renal failure,
the drug accumulates and can cause nephrotoxicity and ototoxicity; dosing is adjusted based on
creatinine clearance and GFR to prevent toxicity. Remember that vancomycin requires trough level
monitoring, and in patients with impaired renal function, the dosing interval is lengthened or the dose is
reduced to maintain therapeutic levels without causing harm.
Q7: A nurse is caring for a patient who has been prescribed lithium carbonate for bipolar disorder. The
patient's most recent lithium level is 1.8 mEq/L (therapeutic range 0.6–1.2 mEq/L). The patient reports
nausea, tremors, and mild confusion. What is the nurse's priority action?
A. Continue the current dose and monitor for worsening symptoms
B. Hold the next dose and notify the provider immediately
C. Administer an antiemetic for the nausea
D. Increase fluid intake to help flush the lithium from the system
Correct Answer: B
Rationale: The best answer is B. A lithium level of 1.8 mEq/L is above the therapeutic range and the
patient is showing early signs of lithium toxicity, so the dose must be held and the provider notified
immediately to prevent progression to severe toxicity. Remember that lithium toxicity can progress to
seizures, coma, and permanent kidney damage if not addressed promptly, and the provider may order
IV fluids, dialysis, or dose reduction based on the severity.
EXAM 2026/2027 | ATI Nursing Education
Pharmacology Review | Verified Q&A | Pass
Guaranteed - A+ Graded
Pharmacokinetics & Pharmacodynamics (Questions 1–18)
Q1: A nurse is caring for a patient who has been prescribed digoxin 0.25 mg PO daily for heart failure.
The nurse understands that digoxin has a narrow therapeutic index. Which statement best describes
what this means?
A. The drug is effective at very low doses and has minimal side effects
B. The difference between the therapeutic dose and the toxic dose is small, requiring careful monitoring
C. The drug can be given in a wide range of doses without adverse effects
D. The therapeutic dose is much higher than the toxic dose, making it very safe
Correct Answer: B
Rationale: The best answer is B. A narrow therapeutic index means the range between the dose that
produces the desired effect and the dose that causes toxicity is very small, so frequent monitoring of
serum drug levels and clinical signs is essential. Remember that digoxin, lithium, phenytoin, and warfarin
are all classic examples of drugs with narrow therapeutic windows where small changes in dose or
patient condition can push the patient from therapeutic to toxic.
Q2: A nurse is caring for a patient with liver cirrhosis who is receiving morphine for pain. The nurse
should expect which change in the patient's response to morphine?
A. Decreased drug effect due to impaired protein binding
B. Increased drug effect and prolonged duration due to decreased metabolism
C. No change in drug effect because the liver doesn't metabolize morphine
D. Faster drug elimination due to increased hepatic blood flow
Correct Answer: B
Rationale: The best answer is B. The liver is the primary site of morphine metabolism, and in cirrhosis,
decreased hepatic function leads to slower breakdown of the drug, causing increased effect and longer
duration of action. Remember that patients with liver disease often need lower doses or longer dosing
,intervals for drugs metabolized by the liver, and you need to monitor closely for signs of accumulation
and toxicity like excessive sedation or respiratory depression.
Q3: A nurse is caring for a patient who has been prescribed gentamicin for a severe infection. The
provider orders peak and trough levels. The nurse understands that peak levels are drawn:
A. Immediately before the next scheduled dose
B. 30 minutes after the infusion is completed
C. At the midpoint between doses
D. 24 hours after the first dose is given
Correct Answer: B
Rationale: The best answer is B. Peak levels for aminoglycosides like gentamicin are drawn 30 minutes
after the infusion ends to capture the highest concentration of drug in the bloodstream, which tells you
if the dose is high enough to kill the bacteria. Remember that trough levels are drawn immediately
before the next dose to ensure the drug isn't accumulating to toxic levels, and both are needed to guide
dosing adjustments for these nephrotoxic and ototoxic drugs.
Q4: A nurse is caring for a patient who has been prescribed warfarin following a pulmonary embolism.
The patient asks why they need frequent blood tests. What is the nurse's best explanation?
A. "Warfarin has a wide therapeutic range, so we need to make sure you're getting enough."
B. "Warfarin has a narrow therapeutic index, and your INR needs to stay in a specific range to prevent
clotting or bleeding."
C. "The blood tests check for infection since warfarin suppresses your immune system."
D. "We need to monitor your kidney function because warfarin is toxic to the kidneys."
Correct Answer: B
Rationale: The best answer is B. Warfarin has a narrow therapeutic index, meaning the difference
between an effective dose and a dangerous dose is small, so INR monitoring ensures the patient is
anticoagulated enough to prevent clots but not so much that they bleed. Remember that the
therapeutic INR for most conditions is 2.0–3.0, and values above 4.0 significantly increase bleeding risk
while values below 1.5 may not provide adequate protection against clots.
Q5: A nurse is caring for a patient who is taking phenytoin for seizure control. The patient's most recent
phenytoin level is 8 mcg/mL (therapeutic range 10–20 mcg/mL). The patient has had two breakthrough
seizures in the past week. What is the nurse's best action?
A. Continue the current dose and reassure the patient that levels will improve
B. Hold the next dose and notify the provider of the subtherapeutic level
C. Increase the dose independently to bring the level into range
, D. Document the level and schedule the next dose as ordered
Correct Answer: B
Rationale: The best answer is B. A phenytoin level of 8 mcg/mL is below the therapeutic range of 10–20,
which explains the breakthrough seizures, and the provider needs to be notified to adjust the dose.
Remember that you never independently increase anticonvulsant doses because rapid changes can
cause toxicity or worsen seizure control; the provider will likely increase the dose gradually and recheck
the level.
Q6: A nurse is caring for a patient with renal failure who is receiving vancomycin for MRSA. The nurse
understands that vancomycin dosing must be adjusted based on which pharmacokinetic parameter?
A. Absorption rate in the gastrointestinal tract
B. Creatinine clearance and glomerular filtration rate
C. Hepatic enzyme activity
D. Protein binding in the plasma
Correct Answer: B
Rationale: The best answer is B. Vancomycin is eliminated primarily by the kidneys, so in renal failure,
the drug accumulates and can cause nephrotoxicity and ototoxicity; dosing is adjusted based on
creatinine clearance and GFR to prevent toxicity. Remember that vancomycin requires trough level
monitoring, and in patients with impaired renal function, the dosing interval is lengthened or the dose is
reduced to maintain therapeutic levels without causing harm.
Q7: A nurse is caring for a patient who has been prescribed lithium carbonate for bipolar disorder. The
patient's most recent lithium level is 1.8 mEq/L (therapeutic range 0.6–1.2 mEq/L). The patient reports
nausea, tremors, and mild confusion. What is the nurse's priority action?
A. Continue the current dose and monitor for worsening symptoms
B. Hold the next dose and notify the provider immediately
C. Administer an antiemetic for the nausea
D. Increase fluid intake to help flush the lithium from the system
Correct Answer: B
Rationale: The best answer is B. A lithium level of 1.8 mEq/L is above the therapeutic range and the
patient is showing early signs of lithium toxicity, so the dose must be held and the provider notified
immediately to prevent progression to severe toxicity. Remember that lithium toxicity can progress to
seizures, coma, and permanent kidney damage if not addressed promptly, and the provider may order
IV fluids, dialysis, or dose reduction based on the severity.
