NCLEX-RN PHARMACOLOGY & DOSAGE CALCULATION MASTER TEST (50
QUESTIONS) Format: Advanced Clinical Scenarios, Multi-Step Calculations &
Complex Explanations
QUESTION 1: CLINICAL PHARMACOLOGY & DIGOXIN TOXICITY
A client with a history of chronic heart failure is admitted displaying signs of digoxin toxicity (HR
42 bpm, yellow-green halos, serum digoxin 3.8 ng/mL, serum potassium 2.9 mEq/L). The nurse
anticipates an order for Digoxin Immune Fab (Digibind). Which of the following pathophysiological
mechanisms and nursing actions takes absolute priority?
(A) Digoxin Immune Fab works by enhancing the renal excretion of free digoxin; monitor for fluid
overload.
(B) Hypokalemia exacerbates digoxin toxicity; correct potassium levels rapidly before giving the
antidote.
(C) Digoxin Immune Fab binds to free digoxin in the intravascular space; continuously monitor for
severe hypokalemia and sudden rapid ventricular response.
(D) Digoxin Immune Fab causes immediate intracellular shifting of digoxin; withhold potassium for
48 hours.
Correct Answer: (C)
Detailed Explanation: Digoxin Immune Fab binds circulating free digoxin. Once neutralized,
the sodium-potassium ATPase pump resumes normal activity, driving potassium back into cells.
This drops serum potassium rapidly, triggering severe hypokalemia and life-threatening
arrhythmias.
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QUESTION 2: HEPARIN PROTOCOL & REVERSAL
A client on IV Unfractionated Heparin has an aPTT of 115 seconds with subconjunctival
hemorrhages and oozing from IV sites. Which sequence of immediate nursing actions is most
appropriate?
(A) Stop the heparin infusion immediately, notify the provider, assess for hidden bleeding,
and prepare Protamine Sulfate.
(B) Decrease heparin rate by 50%, recheck aPTT in 4 hours, and give IV Vitamin K.
(C) Stop heparin, give Fresh Frozen Plasma, and restart infusion when aPTT drops below
80 seconds.
(D) Stop Heparin and Warfarin, give Idarucizumab, and draw CBC.
Correct Answer: (A)
,Detailed Explanation: The aPTT is critically high (normal target 60-80s) with active
bleeding. Stop the infusion, alert the provider, check for internal bleeding, and prepare the
specific Heparin antidote, Protamine Sulfate.
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QUESTION 3: INSULIN PHARMACOKINETICS
A client with type 1 diabetes asks why they need both Insulin Glargine at bedtime and Insulin Lispro before meals. What
is the best response?
(A) Glargine acts rapidly for meals; Lispro acts over 24 hours without a peak.
(B) Glargine provides a peakless, continuous baseline over 24 hours, while Lispro has a rapid onset
of 15 minutes for postprandial glucose control.
(C) Lispro and Glargine can be mixed together in the same syringe at bedtime.
(D) Glargine peaks within 2 to 4 hours; Lispro maintains background coverage.
Correct Answer: (B)
Detailed Explanation: Insulin Glargine is long-acting and peakless (basal). Lispro is rapid-acting
(onset 10-15 mins) to control mealtime glucose spikes. Long-acting insulins must NEVER be mixed
with other insulins in the same syringe.
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QUESTION 4: MAOI & TYRAMINE INTERACTION
A client taking Phenelzine (MAOI) presents with severe occipital headache, palpitations, and BP 210/120 mmHg.
Which assessment question is most crucial?
(A) "Have you missed any doses of Phenelzine over the past 48 hours?"
(B) "Have you recently consumed foods such as aged cheeses, red wine, cured meats, or taken OTC
cold medications?"
(C) "Did you double your dose due to depression?"
(D) "Have you experienced light sensitivity?"
Correct Answer: (B)
Detailed Explanation: MAOIs prevent tyramine breakdown. Ingesting tyramine-rich foods (aged
cheese, red wine, cured meat) or sympathomimetics causes massive norepinephrine release,
precipitating a dangerous hypertensive crisis.
--------------------------------------------------------------------------------
QUESTION 5: AMINOGLYCOSIDE TOXICITY MONITORING
Aclient with AKI receives IV Gentamicin. Which monitoring strategy is imperative to
prevent severe toxicities?
, (A) Trough levels prior to the 4th dose, paired with serum creatinine, BUN, and
auditory/balance assessment.
(B) Peak levels 30 mins prior to infusion, paired with liver transaminases.
(C) Serum sodium levels every 12 hours with reflex testing.
(D) Daily PT/INR with pulmonary function monitoring.
Correct Answer: (A)
Detailed Explanation: Aminoglycosides are nephrotoxic and ototoxic. Trough levels (drawn
immediately before next dose) prevent drug accumulation. Renal functions
(BUN/Creatinine) and balance/hearing assessments monitor organ toxicity.
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QUESTION 6: DOSAGE CALCULATION (MCG/KG/MIN)
Order: Dopamine at 5 mcg/kg/min for a client weighing 176 lbs. Supply: 400 mg in 250 mL
D5W. Calculate flow rate in mL/hr.
(A) 12.0 mL/hr
(B) 15.0 mL/hr
(C) 18.8 mL/hr
(D) 22.5 mL/hr
Correct Answer: (B)
Detailed Calculation:
1. Weight = 176 lbs / 2.2 = 80 kg.
2. Dose/min = 5 mcg/kg/min * 80 kg = 400
mcg/min. 3. Dose/hr = 400 * 60 = 24,000 mcg/hr
= 24 mg/hr. 4. Concentration = 400 mg / 250 mL
= 1.6 mg/mL. 5. Rate = 24 mg/hr / 1.6 mg/mL =
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15 mL/hr.
QUESTION 7: HEPARIN DRIP CALCULATION
Order: Heparin infusion at 1,200 units/hr. Concentration: 25,000 units in 500 mL
0.9% NS. Calculate pump setting in mL/hr.
(A) 20 mL/hr
(B) 24 mL/hr
(C) 28 mL/hr
(D) 30 mL/hr
Correct Answer: (B)
Detailed Calculation:
1. Concentration = 25,000 units / 500 mL = 50 units/mL.
QUESTIONS) Format: Advanced Clinical Scenarios, Multi-Step Calculations &
Complex Explanations
QUESTION 1: CLINICAL PHARMACOLOGY & DIGOXIN TOXICITY
A client with a history of chronic heart failure is admitted displaying signs of digoxin toxicity (HR
42 bpm, yellow-green halos, serum digoxin 3.8 ng/mL, serum potassium 2.9 mEq/L). The nurse
anticipates an order for Digoxin Immune Fab (Digibind). Which of the following pathophysiological
mechanisms and nursing actions takes absolute priority?
(A) Digoxin Immune Fab works by enhancing the renal excretion of free digoxin; monitor for fluid
overload.
(B) Hypokalemia exacerbates digoxin toxicity; correct potassium levels rapidly before giving the
antidote.
(C) Digoxin Immune Fab binds to free digoxin in the intravascular space; continuously monitor for
severe hypokalemia and sudden rapid ventricular response.
(D) Digoxin Immune Fab causes immediate intracellular shifting of digoxin; withhold potassium for
48 hours.
Correct Answer: (C)
Detailed Explanation: Digoxin Immune Fab binds circulating free digoxin. Once neutralized,
the sodium-potassium ATPase pump resumes normal activity, driving potassium back into cells.
This drops serum potassium rapidly, triggering severe hypokalemia and life-threatening
arrhythmias.
--------------------------------------------------------------------------------
QUESTION 2: HEPARIN PROTOCOL & REVERSAL
A client on IV Unfractionated Heparin has an aPTT of 115 seconds with subconjunctival
hemorrhages and oozing from IV sites. Which sequence of immediate nursing actions is most
appropriate?
(A) Stop the heparin infusion immediately, notify the provider, assess for hidden bleeding,
and prepare Protamine Sulfate.
(B) Decrease heparin rate by 50%, recheck aPTT in 4 hours, and give IV Vitamin K.
(C) Stop heparin, give Fresh Frozen Plasma, and restart infusion when aPTT drops below
80 seconds.
(D) Stop Heparin and Warfarin, give Idarucizumab, and draw CBC.
Correct Answer: (A)
,Detailed Explanation: The aPTT is critically high (normal target 60-80s) with active
bleeding. Stop the infusion, alert the provider, check for internal bleeding, and prepare the
specific Heparin antidote, Protamine Sulfate.
--------------------------------------------------------------------------------
QUESTION 3: INSULIN PHARMACOKINETICS
A client with type 1 diabetes asks why they need both Insulin Glargine at bedtime and Insulin Lispro before meals. What
is the best response?
(A) Glargine acts rapidly for meals; Lispro acts over 24 hours without a peak.
(B) Glargine provides a peakless, continuous baseline over 24 hours, while Lispro has a rapid onset
of 15 minutes for postprandial glucose control.
(C) Lispro and Glargine can be mixed together in the same syringe at bedtime.
(D) Glargine peaks within 2 to 4 hours; Lispro maintains background coverage.
Correct Answer: (B)
Detailed Explanation: Insulin Glargine is long-acting and peakless (basal). Lispro is rapid-acting
(onset 10-15 mins) to control mealtime glucose spikes. Long-acting insulins must NEVER be mixed
with other insulins in the same syringe.
--------------------------------------------------------------------------------
QUESTION 4: MAOI & TYRAMINE INTERACTION
A client taking Phenelzine (MAOI) presents with severe occipital headache, palpitations, and BP 210/120 mmHg.
Which assessment question is most crucial?
(A) "Have you missed any doses of Phenelzine over the past 48 hours?"
(B) "Have you recently consumed foods such as aged cheeses, red wine, cured meats, or taken OTC
cold medications?"
(C) "Did you double your dose due to depression?"
(D) "Have you experienced light sensitivity?"
Correct Answer: (B)
Detailed Explanation: MAOIs prevent tyramine breakdown. Ingesting tyramine-rich foods (aged
cheese, red wine, cured meat) or sympathomimetics causes massive norepinephrine release,
precipitating a dangerous hypertensive crisis.
--------------------------------------------------------------------------------
QUESTION 5: AMINOGLYCOSIDE TOXICITY MONITORING
Aclient with AKI receives IV Gentamicin. Which monitoring strategy is imperative to
prevent severe toxicities?
, (A) Trough levels prior to the 4th dose, paired with serum creatinine, BUN, and
auditory/balance assessment.
(B) Peak levels 30 mins prior to infusion, paired with liver transaminases.
(C) Serum sodium levels every 12 hours with reflex testing.
(D) Daily PT/INR with pulmonary function monitoring.
Correct Answer: (A)
Detailed Explanation: Aminoglycosides are nephrotoxic and ototoxic. Trough levels (drawn
immediately before next dose) prevent drug accumulation. Renal functions
(BUN/Creatinine) and balance/hearing assessments monitor organ toxicity.
--------------------------------------------------------------------------------
QUESTION 6: DOSAGE CALCULATION (MCG/KG/MIN)
Order: Dopamine at 5 mcg/kg/min for a client weighing 176 lbs. Supply: 400 mg in 250 mL
D5W. Calculate flow rate in mL/hr.
(A) 12.0 mL/hr
(B) 15.0 mL/hr
(C) 18.8 mL/hr
(D) 22.5 mL/hr
Correct Answer: (B)
Detailed Calculation:
1. Weight = 176 lbs / 2.2 = 80 kg.
2. Dose/min = 5 mcg/kg/min * 80 kg = 400
mcg/min. 3. Dose/hr = 400 * 60 = 24,000 mcg/hr
= 24 mg/hr. 4. Concentration = 400 mg / 250 mL
= 1.6 mg/mL. 5. Rate = 24 mg/hr / 1.6 mg/mL =
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15 mL/hr.
QUESTION 7: HEPARIN DRIP CALCULATION
Order: Heparin infusion at 1,200 units/hr. Concentration: 25,000 units in 500 mL
0.9% NS. Calculate pump setting in mL/hr.
(A) 20 mL/hr
(B) 24 mL/hr
(C) 28 mL/hr
(D) 30 mL/hr
Correct Answer: (B)
Detailed Calculation:
1. Concentration = 25,000 units / 500 mL = 50 units/mL.
