ATI Pharmacology Proctored Exam 2025 — 55 Q&A Study Guide
Verified Answers Complete
Series:
CrashCourses Professional Study Series
Author:
Dr Z. Moomba, MBChB, MRCPsych | BethelWellness Ltd
Exam Target:
ATI Pharmacology
Year:
2025/2026
Format:
55 Questions with Verified Answers and Rationales
>
Author's Note:
This document is an original work produced for the CrashCourses Professional Study Series.
Clinical questions and professional scenarios were composed by Dr Z. Moomba based on current
exam objectives, published guidelines, and evidence-based sources (2024–2025). All patient
names, ages, and case details are fictional. Any resemblance to existing published Q&A banks is
coincidental. For personal study use only — not for reproduction or redistribution.
SECTION A — FOUNDATIONS
A nurse is preparing to administer intravenous phenytoin to a client experiencing status
epilepticus. Which of the following is the most appropriate action for the nurse to take
regarding the administration of this medication?
A. Mix the phenytoin in a 5% dextrose in water (D5W) solution.
B. Administer the infusion rapidly over 2 minutes to ensure immediate effect.
C. Flush the intravenous line with 0.9% sodium chloride before and after administration.
D. Discontinue cardiac monitoring once the infusion has been running for 5 minutes.
Answer: C
,Rationale:
a) Phenytoin precipitates in solutions containing dextrose; it must only be mixed or flushed with
normal saline (0.9% sodium chloride).
b) Ensuring the IV line is clear of incompatible fluids prevents crystallisation in the tubing, which is
a critical safety step.
c) Administering the infusion rapidly (Option B) is incorrect because phenytoin must not exceed an
infusion rate of 50 mg/min to prevent severe hypotension and cardiac arrhythmias.
d) Examiner Pearl: Continuous cardiac monitoring is mandatory during IV phenytoin administration
due to the high risk of dysrhythmias and bradycardia [BNF 2025].
A client with type 2 diabetes mellitus is prescribed subcutaneous insulin glargine once daily at
bedtime. The client asks the nurse if they can mix their morning lispro insulin with the glargine
to save an injection. What is the priority nursing education?
A. "You can mix them, but always draw up the clear glargine before the cloudy lispro."
B. "Glargine must never be mixed with any other insulin in the same syringe."
C. "It is safe to mix them as long as you administer the injection within 5 minutes."
D. "You should only mix glargine with NPH insulin, not rapid-acting insulin."
Answer: B
Rationale:
a) Insulin glargine is a long-acting, basal insulin formulated with a specific acidic pH. Mixing it with
other insulins alters its absorption profile and destroys its peakless, 24-hour delivery mechanism.
b) The absolute contraindication of mixing glargine sets it apart from intermediate-acting insulins
(like NPH) which can be mixed with short or rapid-acting insulins.
c) Option A incorrectly applies the "clear before cloudy" rule to glargine; glargine is clear, but it
still cannot be mixed.
d) Examiner Pearl: Glargine has no pronounced peak; therefore, the risk of profound
hypoglycaemia at a specific time is lower than with NPH [ADA Standards of Care 2025].
A client is prescribed oral spironolactone for the management of heart failure. Which statement
by the client indicates a need for further teaching?
A. "I will avoid using salt substitutes that contain potassium."
B. "I should report any breast tenderness or enlargement to my doctor."
C. "I will take a daily potassium supplement to prevent muscle cramps."
D. "I will have my kidney function and blood levels checked regularly."
,Answer: C
Rationale:
a) Spironolactone is a potassium-sparing diuretic. Taking additional potassium supplements can
lead to life-threatening hyperkalaemia.
b) The recognition that potassium must be restricted (not supplemented) is the key safety
parameter for this drug class.
c) Option A is a correct action by the client, as many salt substitutes are primarily potassium
chloride, which would further increase hyperkalaemia risk.
d) Examiner Pearl: Spironolactone has anti-androgenic effects, frequently causing gynaecomastia
and menstrual irregularities [AHA Heart Failure Guidelines 2025].
A nurse is reviewing the medication administration record of a client with a new prescription for
an ACE inhibitor, lisinopril. The nurse should hold the medication and notify the provider if the
client has a history of which of the following?
A. Asthma
B. Angioedema
C. Bradycardia
D. Hypokalaemia
Answer: B
Rationale:
a) A history of angioedema (especially related to prior ACE inhibitor use) is an absolute
contraindication for lisinopril due to the risk of life-threatening airway compromise.
b) ACE inhibitors prevent the breakdown of bradykinin, leading to vasodilation and increased
vascular permeability, which causes angioedema.
c) Asthma (Option A) is a contraindication for non-selective beta-blockers, not ACE inhibitors. ACE
inhibitors can cause a dry cough, but this is distinct from asthma exacerbation.
d) Examiner Pearl: ACE inhibitors can cause hyperkalaemia, not hypokalaemia; therefore,
concurrent use of spironolactone requires extreme caution [NICE NG136].
A client receiving continuous IV heparin for a deep vein thrombosis develops new petechiae
and a sudden drop in platelet count from 250,000/mm³ to 80,000/mm³ on day 6 of therapy.
What is the priority nursing action?
A. Administer protamine sulphate immediately.
B. Stop the heparin infusion and notify the provider.
, C. Prepare to transfuse platelets.
D. Decrease the heparin infusion rate by half.
Answer: B
Rationale:
a) A sudden, significant drop in platelets occurring 5 to 10 days after starting heparin strongly
suggests Heparin-Induced Thrombocytopenia (HIT), a paradoxical prothrombotic immune
reaction. The immediate action is to stop all heparin exposure.
b) Recognising the specific timeline (day 5-10) and the precipitous platelet drop differentiates HIT
from general medication-induced bleeding.
c) Protamine sulphate (Option A) is the antidote for heparin overdose/bleeding, but it does not
treat the immune-mediated cascade of HIT.
d) Examiner Pearl: Clients with HIT must have heparin listed as a life-threatening allergy and
should be transitioned to a direct thrombin inhibitor like argatroban [Chest Guidelines 2024].
A client with chronic asthma is prescribed an albuterol metered-dose inhaler (MDI). Which
instruction should the nurse include in the teaching plan?
A. "Administer this medication twice daily to prevent asthma attacks."
B. "Wait at least 1 minute between puffs if a second puff is needed."
C. "Rinse your mouth out with water immediately after using the inhaler."
D. "Exhale completely while pressing the canister down."
Answer: B
Rationale:
a) Waiting 1 minute between puffs allows the first dose to dilate the airways, facilitating deeper
penetration of the second dose.
b) Proper MDI technique is essential for drug delivery; rapid successive puffs are ineffective.
c) Rinsing the mouth (Option C) is necessary for inhaled corticosteroids (e.g., fluticasone) to
prevent oral thrush, not for short-acting beta-agonists (SABAs) like albuterol.
d) Examiner Pearl: Albuterol is a rescue inhaler used PRN for acute bronchospasm; it is not a
scheduled preventative medication [GINA Guidelines 2025].
A nurse is caring for a client receiving intravenous vancomycin for a severe MRSA infection.
During the infusion, the client develops a flushed face, tachycardia, and a red rash on the upper
body. What is the nurse's priority action?
Verified Answers Complete
Series:
CrashCourses Professional Study Series
Author:
Dr Z. Moomba, MBChB, MRCPsych | BethelWellness Ltd
Exam Target:
ATI Pharmacology
Year:
2025/2026
Format:
55 Questions with Verified Answers and Rationales
>
Author's Note:
This document is an original work produced for the CrashCourses Professional Study Series.
Clinical questions and professional scenarios were composed by Dr Z. Moomba based on current
exam objectives, published guidelines, and evidence-based sources (2024–2025). All patient
names, ages, and case details are fictional. Any resemblance to existing published Q&A banks is
coincidental. For personal study use only — not for reproduction or redistribution.
SECTION A — FOUNDATIONS
A nurse is preparing to administer intravenous phenytoin to a client experiencing status
epilepticus. Which of the following is the most appropriate action for the nurse to take
regarding the administration of this medication?
A. Mix the phenytoin in a 5% dextrose in water (D5W) solution.
B. Administer the infusion rapidly over 2 minutes to ensure immediate effect.
C. Flush the intravenous line with 0.9% sodium chloride before and after administration.
D. Discontinue cardiac monitoring once the infusion has been running for 5 minutes.
Answer: C
,Rationale:
a) Phenytoin precipitates in solutions containing dextrose; it must only be mixed or flushed with
normal saline (0.9% sodium chloride).
b) Ensuring the IV line is clear of incompatible fluids prevents crystallisation in the tubing, which is
a critical safety step.
c) Administering the infusion rapidly (Option B) is incorrect because phenytoin must not exceed an
infusion rate of 50 mg/min to prevent severe hypotension and cardiac arrhythmias.
d) Examiner Pearl: Continuous cardiac monitoring is mandatory during IV phenytoin administration
due to the high risk of dysrhythmias and bradycardia [BNF 2025].
A client with type 2 diabetes mellitus is prescribed subcutaneous insulin glargine once daily at
bedtime. The client asks the nurse if they can mix their morning lispro insulin with the glargine
to save an injection. What is the priority nursing education?
A. "You can mix them, but always draw up the clear glargine before the cloudy lispro."
B. "Glargine must never be mixed with any other insulin in the same syringe."
C. "It is safe to mix them as long as you administer the injection within 5 minutes."
D. "You should only mix glargine with NPH insulin, not rapid-acting insulin."
Answer: B
Rationale:
a) Insulin glargine is a long-acting, basal insulin formulated with a specific acidic pH. Mixing it with
other insulins alters its absorption profile and destroys its peakless, 24-hour delivery mechanism.
b) The absolute contraindication of mixing glargine sets it apart from intermediate-acting insulins
(like NPH) which can be mixed with short or rapid-acting insulins.
c) Option A incorrectly applies the "clear before cloudy" rule to glargine; glargine is clear, but it
still cannot be mixed.
d) Examiner Pearl: Glargine has no pronounced peak; therefore, the risk of profound
hypoglycaemia at a specific time is lower than with NPH [ADA Standards of Care 2025].
A client is prescribed oral spironolactone for the management of heart failure. Which statement
by the client indicates a need for further teaching?
A. "I will avoid using salt substitutes that contain potassium."
B. "I should report any breast tenderness or enlargement to my doctor."
C. "I will take a daily potassium supplement to prevent muscle cramps."
D. "I will have my kidney function and blood levels checked regularly."
,Answer: C
Rationale:
a) Spironolactone is a potassium-sparing diuretic. Taking additional potassium supplements can
lead to life-threatening hyperkalaemia.
b) The recognition that potassium must be restricted (not supplemented) is the key safety
parameter for this drug class.
c) Option A is a correct action by the client, as many salt substitutes are primarily potassium
chloride, which would further increase hyperkalaemia risk.
d) Examiner Pearl: Spironolactone has anti-androgenic effects, frequently causing gynaecomastia
and menstrual irregularities [AHA Heart Failure Guidelines 2025].
A nurse is reviewing the medication administration record of a client with a new prescription for
an ACE inhibitor, lisinopril. The nurse should hold the medication and notify the provider if the
client has a history of which of the following?
A. Asthma
B. Angioedema
C. Bradycardia
D. Hypokalaemia
Answer: B
Rationale:
a) A history of angioedema (especially related to prior ACE inhibitor use) is an absolute
contraindication for lisinopril due to the risk of life-threatening airway compromise.
b) ACE inhibitors prevent the breakdown of bradykinin, leading to vasodilation and increased
vascular permeability, which causes angioedema.
c) Asthma (Option A) is a contraindication for non-selective beta-blockers, not ACE inhibitors. ACE
inhibitors can cause a dry cough, but this is distinct from asthma exacerbation.
d) Examiner Pearl: ACE inhibitors can cause hyperkalaemia, not hypokalaemia; therefore,
concurrent use of spironolactone requires extreme caution [NICE NG136].
A client receiving continuous IV heparin for a deep vein thrombosis develops new petechiae
and a sudden drop in platelet count from 250,000/mm³ to 80,000/mm³ on day 6 of therapy.
What is the priority nursing action?
A. Administer protamine sulphate immediately.
B. Stop the heparin infusion and notify the provider.
, C. Prepare to transfuse platelets.
D. Decrease the heparin infusion rate by half.
Answer: B
Rationale:
a) A sudden, significant drop in platelets occurring 5 to 10 days after starting heparin strongly
suggests Heparin-Induced Thrombocytopenia (HIT), a paradoxical prothrombotic immune
reaction. The immediate action is to stop all heparin exposure.
b) Recognising the specific timeline (day 5-10) and the precipitous platelet drop differentiates HIT
from general medication-induced bleeding.
c) Protamine sulphate (Option A) is the antidote for heparin overdose/bleeding, but it does not
treat the immune-mediated cascade of HIT.
d) Examiner Pearl: Clients with HIT must have heparin listed as a life-threatening allergy and
should be transitioned to a direct thrombin inhibitor like argatroban [Chest Guidelines 2024].
A client with chronic asthma is prescribed an albuterol metered-dose inhaler (MDI). Which
instruction should the nurse include in the teaching plan?
A. "Administer this medication twice daily to prevent asthma attacks."
B. "Wait at least 1 minute between puffs if a second puff is needed."
C. "Rinse your mouth out with water immediately after using the inhaler."
D. "Exhale completely while pressing the canister down."
Answer: B
Rationale:
a) Waiting 1 minute between puffs allows the first dose to dilate the airways, facilitating deeper
penetration of the second dose.
b) Proper MDI technique is essential for drug delivery; rapid successive puffs are ineffective.
c) Rinsing the mouth (Option C) is necessary for inhaled corticosteroids (e.g., fluticasone) to
prevent oral thrush, not for short-acting beta-agonists (SABAs) like albuterol.
d) Examiner Pearl: Albuterol is a rescue inhaler used PRN for acute bronchospasm; it is not a
scheduled preventative medication [GINA Guidelines 2025].
A nurse is caring for a client receiving intravenous vancomycin for a severe MRSA infection.
During the infusion, the client develops a flushed face, tachycardia, and a red rash on the upper
body. What is the nurse's priority action?
