ATI CMS Pharmacology Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. A patient prescribed digoxin for heart failure presents with nausea,
vomiting, and visual disturbances characterized by yellow-green halos
around lights. Which of the following serum laboratory values is most
consistent with this clinical presentation?
A. Serum potassium of 4.2 mEq/L
B. Serum digoxin level of 0.8 ng/mL
C. Serum magnesium of 2.0 mEq/L
D. Serum digoxin level of 2.5 ng/mL
Answer: D
Rationale: The patient is exhibiting classic signs of digoxin toxicity, which
include gastrointestinal symptoms (nausea, vomiting) and visual
disturbances (xanthopsia, or yellow-green halos). A therapeutic serum
digoxin level is typically between 0.8 and 2.0 ng/mL. A level of 2.5 ng/mL
is above the therapeutic range and is strongly associated with toxicity.
Hypokalemia, hypomagnesemia, and hypercalcemia can precipitate
toxicity at lower levels, but the elevated digoxin level is the direct cause of
the symptoms described.
2. A nurse is preparing to administer intravenous heparin to a patient with a
pulmonary embolism. Which of the following baseline laboratory tests is
most critical to obtain prior to initiating therapy?
A. Serum creatinine
B. Activated partial thromboplastin time (aPTT)
C. Prothrombin time (PT) and International Normalized Ratio (INR)
D. Complete blood count (CBC) with platelet count
, Answer: D
Rationale: Heparin can cause heparin-induced thrombocytopenia (HIT), a
life-threatening immune-mediated reaction characterized by a significant
drop in platelet count. A baseline CBC with platelet count is essential to
monitor for this complication. While aPTT is used for monitoring the
therapeutic effect of heparin, it is not the most critical baseline test to
obtain for safety. PT/INR is used for warfarin monitoring, and serum
creatinine is not the primary baseline test for heparin therapy safety.
3. A patient is prescribed an ACE inhibitor for hypertension. Which of the
following adverse effects is unique to this class of antihypertensives and
should be closely monitored?
A. Dry cough
B. Peripheral edema
C. Hypokalemia
D. Reflex tachycardia
Answer: A
Rationale: A persistent, dry, non-productive cough is a hallmark adverse
effect of ACE inhibitors due to the accumulation of bradykinin and
substance P in the lungs. Peripheral edema is more common with calcium
channel blockers. ACE inhibitors can cause hyperkalemia, not
hypokalemia. Reflex tachycardia is a compensatory response to
vasodilation, but is less common with ACE inhibitors compared to direct
vasodilators and is not unique to this class.
4. A nurse is providing education to a patient starting on an MAOI. The patient
asks if it is safe to drink red wine while taking this medication. Which of the
following responses by the nurse is correct?
A. "Red wine is allowed as long as you drink it with food."
B. "Red wine is strictly forbidden due to the risk of a hypertensive crisis."
C. "Red wine is safe, but you should limit your intake to one glass per day."
D. "Red wine is acceptable if you have taken your MAOI at least 2 hours
prior."
Answer: B
, Rationale: MAOIs interact with tyramine, an amino acid found in aged,
fermented, or pickled foods, including red wine. This interaction can cause
a severe hypertensive crisis. All tyramine-containing foods and beverages,
including red wine, are strictly contraindicated. The risk is not mitigated
by taking the medication with food, limiting intake, or timing the dose.
5. A patient with type 2 diabetes is started on metformin. Which of the
following instructions regarding this medication is most important for the
nurse to include in the patient's teaching?
A. "Take this medication with a meal to reduce gastrointestinal upset."
B. "Monitor your blood glucose for signs of hypoglycemia, especially at
night."
C. "Report any muscle pain or weakness to your healthcare provider
immediately."
D. "This medication will provide a rapid drop in your blood sugar after each
dose."
Answer: C
Rationale: Metformin carries a rare but serious risk of lactic acidosis, a
medical emergency. Early signs include muscle aches, weakness, and
malaise. The most important instruction is to report these symptoms
immediately so the drug can be held and the patient can be evaluated.
Metformin should be taken with meals to reduce GI upset, but this is a
lower-priority safety teaching point. Metformin does not typically cause
hypoglycemia and does not provide a rapid drop in blood sugar; it works
primarily by decreasing hepatic glucose production.
6. A patient is prescribed warfarin. The nurse should reinforce that which of
the following over-the-counter medications has the most significant
potential to increase the INR and the risk of bleeding?
A. Acetaminophen
B. Ibuprofen
C. Diphenhydramine
D. Omeprazole
Answer: B
, Rationale: Ibuprofen, a nonsteroidal anti-inflammatory drug (NSAID),
inhibits platelet aggregation and can cause gastrointestinal bleeding.
When combined with warfarin, an anticoagulant, this significantly
increases the risk of bleeding and an elevated INR. While acetaminophen
can have a mild effect on INR at very high doses, its effect is far less
significant than that of NSAIDs. Diphenhydramine and omeprazole do not
have the same level of clinically significant interaction.
7. A nurse is caring for a patient receiving an aminoglycoside antibiotic. The
patient's serum creatinine level has increased from 1.0 mg/dL to 1.8 mg/dL
since starting the medication. Which of the following is the priority nursing
action?
A. Administer the next dose of the antibiotic as scheduled.
B. Hold the next dose and notify the healthcare provider.
C. Encourage the patient to increase their oral fluid intake.
D. Obtain a serum trough level for the antibiotic.
Answer: B
Rationale: The increase in serum creatinine indicates acute kidney injury, a
known adverse effect of aminoglycosides. The priority action is to hold the
next dose and notify the healthcare provider to prevent further
nephrotoxicity. Administering the dose would be unsafe. While fluid intake
may be encouraged if not contraindicated, it is not the immediate priority
over holding the medication and contacting the provider. Obtaining a
serum trough level may be part of the assessment but does not address
the immediate need to discontinue the nephrotoxic agent.
8. A patient with heart failure is prescribed furosemide. Which of the
following dietary instructions is most important to include in the patient's
teaching?
A. "Increase your intake of potassium-rich foods."
B. "Restrict your intake of foods high in sodium."
C. "Limit your daily fluid intake to 1.5 liters."
D. "Avoid foods high in vitamin K."
Answer: A
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A patient prescribed digoxin for heart failure presents with nausea,
vomiting, and visual disturbances characterized by yellow-green halos
around lights. Which of the following serum laboratory values is most
consistent with this clinical presentation?
A. Serum potassium of 4.2 mEq/L
B. Serum digoxin level of 0.8 ng/mL
C. Serum magnesium of 2.0 mEq/L
D. Serum digoxin level of 2.5 ng/mL
Answer: D
Rationale: The patient is exhibiting classic signs of digoxin toxicity, which
include gastrointestinal symptoms (nausea, vomiting) and visual
disturbances (xanthopsia, or yellow-green halos). A therapeutic serum
digoxin level is typically between 0.8 and 2.0 ng/mL. A level of 2.5 ng/mL
is above the therapeutic range and is strongly associated with toxicity.
Hypokalemia, hypomagnesemia, and hypercalcemia can precipitate
toxicity at lower levels, but the elevated digoxin level is the direct cause of
the symptoms described.
2. A nurse is preparing to administer intravenous heparin to a patient with a
pulmonary embolism. Which of the following baseline laboratory tests is
most critical to obtain prior to initiating therapy?
A. Serum creatinine
B. Activated partial thromboplastin time (aPTT)
C. Prothrombin time (PT) and International Normalized Ratio (INR)
D. Complete blood count (CBC) with platelet count
, Answer: D
Rationale: Heparin can cause heparin-induced thrombocytopenia (HIT), a
life-threatening immune-mediated reaction characterized by a significant
drop in platelet count. A baseline CBC with platelet count is essential to
monitor for this complication. While aPTT is used for monitoring the
therapeutic effect of heparin, it is not the most critical baseline test to
obtain for safety. PT/INR is used for warfarin monitoring, and serum
creatinine is not the primary baseline test for heparin therapy safety.
3. A patient is prescribed an ACE inhibitor for hypertension. Which of the
following adverse effects is unique to this class of antihypertensives and
should be closely monitored?
A. Dry cough
B. Peripheral edema
C. Hypokalemia
D. Reflex tachycardia
Answer: A
Rationale: A persistent, dry, non-productive cough is a hallmark adverse
effect of ACE inhibitors due to the accumulation of bradykinin and
substance P in the lungs. Peripheral edema is more common with calcium
channel blockers. ACE inhibitors can cause hyperkalemia, not
hypokalemia. Reflex tachycardia is a compensatory response to
vasodilation, but is less common with ACE inhibitors compared to direct
vasodilators and is not unique to this class.
4. A nurse is providing education to a patient starting on an MAOI. The patient
asks if it is safe to drink red wine while taking this medication. Which of the
following responses by the nurse is correct?
A. "Red wine is allowed as long as you drink it with food."
B. "Red wine is strictly forbidden due to the risk of a hypertensive crisis."
C. "Red wine is safe, but you should limit your intake to one glass per day."
D. "Red wine is acceptable if you have taken your MAOI at least 2 hours
prior."
Answer: B
, Rationale: MAOIs interact with tyramine, an amino acid found in aged,
fermented, or pickled foods, including red wine. This interaction can cause
a severe hypertensive crisis. All tyramine-containing foods and beverages,
including red wine, are strictly contraindicated. The risk is not mitigated
by taking the medication with food, limiting intake, or timing the dose.
5. A patient with type 2 diabetes is started on metformin. Which of the
following instructions regarding this medication is most important for the
nurse to include in the patient's teaching?
A. "Take this medication with a meal to reduce gastrointestinal upset."
B. "Monitor your blood glucose for signs of hypoglycemia, especially at
night."
C. "Report any muscle pain or weakness to your healthcare provider
immediately."
D. "This medication will provide a rapid drop in your blood sugar after each
dose."
Answer: C
Rationale: Metformin carries a rare but serious risk of lactic acidosis, a
medical emergency. Early signs include muscle aches, weakness, and
malaise. The most important instruction is to report these symptoms
immediately so the drug can be held and the patient can be evaluated.
Metformin should be taken with meals to reduce GI upset, but this is a
lower-priority safety teaching point. Metformin does not typically cause
hypoglycemia and does not provide a rapid drop in blood sugar; it works
primarily by decreasing hepatic glucose production.
6. A patient is prescribed warfarin. The nurse should reinforce that which of
the following over-the-counter medications has the most significant
potential to increase the INR and the risk of bleeding?
A. Acetaminophen
B. Ibuprofen
C. Diphenhydramine
D. Omeprazole
Answer: B
, Rationale: Ibuprofen, a nonsteroidal anti-inflammatory drug (NSAID),
inhibits platelet aggregation and can cause gastrointestinal bleeding.
When combined with warfarin, an anticoagulant, this significantly
increases the risk of bleeding and an elevated INR. While acetaminophen
can have a mild effect on INR at very high doses, its effect is far less
significant than that of NSAIDs. Diphenhydramine and omeprazole do not
have the same level of clinically significant interaction.
7. A nurse is caring for a patient receiving an aminoglycoside antibiotic. The
patient's serum creatinine level has increased from 1.0 mg/dL to 1.8 mg/dL
since starting the medication. Which of the following is the priority nursing
action?
A. Administer the next dose of the antibiotic as scheduled.
B. Hold the next dose and notify the healthcare provider.
C. Encourage the patient to increase their oral fluid intake.
D. Obtain a serum trough level for the antibiotic.
Answer: B
Rationale: The increase in serum creatinine indicates acute kidney injury, a
known adverse effect of aminoglycosides. The priority action is to hold the
next dose and notify the healthcare provider to prevent further
nephrotoxicity. Administering the dose would be unsafe. While fluid intake
may be encouraged if not contraindicated, it is not the immediate priority
over holding the medication and contacting the provider. Obtaining a
serum trough level may be part of the assessment but does not address
the immediate need to discontinue the nephrotoxic agent.
8. A patient with heart failure is prescribed furosemide. Which of the
following dietary instructions is most important to include in the patient's
teaching?
A. "Increase your intake of potassium-rich foods."
B. "Restrict your intake of foods high in sodium."
C. "Limit your daily fluid intake to 1.5 liters."
D. "Avoid foods high in vitamin K."
Answer: A
