NCLEX Pharmacology Practice Questions — 40 Free Questions (Unofficial)
An unofficial practice set for NCLEX-RN pharmacology fundamentals. 40 original questions on routes and absorption, distribution and binding, metabolism, excretion, therapeutic levels and evaluating drug effects, each with a rationale.
- Questions: 40 multiple choice, each with an explanation.
- Based on: Original scenarios adapted from Nursing Pharmacology 2e, Open RN (eds. Kimberly Ernstmeyer and Elizabeth Christman), © 2023 WisTech Open, licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Scenarios, options and rationales rewritten; no author or NCSBN endorsement.
- Affiliation: Unofficial. Not affiliated with any exam board, agency or state.
- Last reviewed: 2026-11-04.
Topics covered
- Absorption and Routes
- Distribution and Binding
- Metabolism
- Excretion
- Therapeutic Levels
- Evaluating Drug Effects
All 40 questions with answers
Try each question first, then open the answer. To practice them as a timed quiz with a score and a mistake list, use the practice test.
Absorption and Routes
1. A tablet moves from the intestinal lumen into circulating blood. Which pharmacokinetic process is illustrated?
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Answer: B. Absorption
Absorption moves drug from an administration site into circulation.
2. A medication is given through a nasogastric tube into the stomach. Which route category applies?
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Answer: A. Enteral
Delivery through a feeding tube into the gastrointestinal tract is enteral.
3. A dose enters a vein directly. Which route avoids an intestinal absorption step?
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Answer: D. Intravenous
Intravenous administration places the dose directly in circulation.
4. A swallowed drug loses part of its active amount before reaching systemic circulation. Which concept best explains presystemic intestinal and hepatic metabolism?
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Answer: B. First-pass effect
Presystemic metabolism can reduce the amount reaching systemic circulation.
5. Which delivery method can provide gradual systemic delivery through skin?
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Answer: A. Transdermal patch
A transdermal formulation delivers suitable molecules across the skin over time.
6. A student says every oral drug works as quickly as an IV dose. Which response best corrects the claim?
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Answer: D. Oral delivery adds absorption and possible first-pass effects
Route changes absorption and presystemic exposure; equal timing is not guaranteed.
7. A study compares oral drug exposure in infants and adults. Which developmental factor must be considered?
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Answer: A. Immature gastrointestinal and hepatic processes in infants
Development can change absorption and first-pass elimination; drug-specific assessment remains necessary.
8. Which process explains a drug moving from a muscle injection site into local blood vessels?
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Answer: A. Absorption
Movement from the administration site to circulation is absorption.
Distribution and Binding
9. After entering circulation, a drug reaches distant tissues. Which process describes this movement?
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Answer: B. Distribution
Distribution concerns transport between blood and tissues.
10. A limb has reduced blood flow. Which pharmacokinetic step can be affected when a drug is transported toward that tissue?
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Answer: A. Distribution
Blood flow influences delivery to tissues.
11. For many protein-bound drugs, which fraction can readily leave plasma and interact with tissue receptors?
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Answer: B. The unbound fraction
Free drug is available for distribution and initial receptor interaction.
12. A drug binds reversibly to plasma proteins. What role can that binding play?
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Answer: C. A reservoir that releases drug over time
Reversible binding can sustain a pool of drug available for later release.
13. A client has low albumin and takes a highly protein-bound medication. Which concern is most relevant?
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Answer: D. A change in the free fraction and drug response
Reduced binding capacity can alter free drug exposure; clinical effects require assessment.
14. Two drugs compete for plasma binding sites. Which quantity may change directly?
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Answer: D. The amount of unbound drug
Binding-site competition can alter free concentrations.
15. A drug enters some tissues readily but reaches the central nervous system poorly. Which barrier can contribute?
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Answer: B. The blood-brain barrier
The blood-brain barrier restricts entry of many substances into the CNS.
16. A lipophilic drug accumulates disproportionately in adipose tissue. Which property helps explain this distribution pattern?
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Answer: C. Its affinity for lipid environments
Lipid solubility can favor distribution into fat; this does not prescribe a dose.
Metabolism
17. A drug molecule is chemically changed into a metabolite. Which process is occurring?
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Answer: C. Metabolism
Metabolism involves chemical biotransformation.
18. Which organ is a major site of drug biotransformation?
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Answer: C. Liver
Hepatic enzymes metabolize many drugs; metabolism is not confined exclusively to the liver.
19. A medication is inactive when administered and is converted to an active compound. What is the original medication called?
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Answer: D. A prodrug
A prodrug requires conversion to produce its active form.
20. Which transformation is characteristic of phase II metabolism?
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Answer: D. Conjugation with another molecule
Conjugation often increases water solubility and facilitates elimination.
21. A new medicine inhibits the enzyme that metabolizes an existing active drug. Assuming other factors are unchanged, what concern deserves review?
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Answer: D. Greater exposure to the existing drug
Inhibiting an important metabolic pathway can increase exposure; the magnitude is drug specific.
22. A metabolite retains pharmacologic activity. Which statement is correct?
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Answer: A. Metabolism does not always immediately end a drug's effects
Some metabolites remain active, so biotransformation is not synonymous with inactivation.
Excretion
23. An unchanged drug is removed from blood into urine. Which process is illustrated?
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Answer: D. Excretion
Excretion removes drug or metabolites from the body.
24. Which organs provide the most common route of drug excretion described in this chapter?
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Answer: D. Kidneys
Renal elimination into urine is a major excretory route.
25. A renally cleared drug is given to a client whose kidney function has declined. Which risk should be assessed?
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Answer: C. Reduced elimination and possible accumulation
Reduced renal function can reduce clearance; any dose change requires appropriate prescribing review.
26. Which result is directly relevant when reviewing renal drug clearance?
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Answer: A. Estimated glomerular filtration rate
GFR and other renal measures help assess elimination capacity.
27. A drug is secreted into bile and then reaches the intestine. What possible route can remove drug that is not reabsorbed?
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Answer: A. Fecal excretion
Unabsorbed biliary drug and metabolites may leave in feces.
28. Why can reduced renal perfusion from heart failure matter for a renally eliminated medication?
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Answer: A. It can decrease filtration and elimination
Renal blood flow can influence elimination; effects depend on the drug and client.
Therapeutic Levels
29. Drug levels remain above the effective threshold and below the toxic threshold. Which concept describes this interval?
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Answer: A. Therapeutic window
The therapeutic window lies between ineffective and toxic exposure.
30. For a medication monitored with trough levels, a sample is ordered immediately before the next dose. What is being measured?
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Answer: C. The low concentration at the end of the dosing interval
A trough is sampled at the low point before the next scheduled dose.
31. For a drug requiring peak monitoring, why is the collection time important?
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Answer: A. The result must correspond to the protocol's expected high-concentration sampling time
Peak interpretation depends on timing relative to administration and the specific protocol.
32. A drug level exceeds the laboratory's stated toxic threshold. Which interpretation is justified?
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Answer: A. The concentration raises a toxicity concern requiring prompt clinical review
A value above the toxic boundary is a safety concern; this does not itself specify a replacement dose.
33. Why should an actual dose time be documented when interpreting a timed drug level?
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Answer: D. It helps determine whether the sample represents the intended monitoring point
Dose and sample timing are necessary context for level interpretation.
34. A student proposes using one universal peak sampling time for every medication. Which response is best?
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Answer: C. Use the drug-specific order and monitoring protocol
Formulation, route and protocol determine appropriate collection timing.
Evaluating Drug Effects
35. Two drugs produce a specified effect at different amounts. Which term describes the amount required for that effect?
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Answer: A. Potency
Potency refers to the amount needed for a defined response, not necessarily superior maximum benefit.
36. A highly potent drug is prescribed. Which assumption should be rejected?
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Answer: D. Higher potency automatically means greater safety
Potency describes dose-response properties, not an automatic safety advantage.
37. A medication acts on intended receptors and also affects other tissues. What should the nurse monitor?
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Answer: D. Both desired effects and unwanted effects
Selectivity is incomplete for many drugs, so unintended effects still require assessment.
38. A client develops a known unwanted effect after a medication. Which statement is appropriate?
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Answer: C. A known side effect still requires assessment in that client's context
Predictability does not establish that an effect is acceptable or safe in every client.
39. A severe harmful medication reaction occurs. Which response best fits the nurse's monitoring role?
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Answer: B. Assess and promptly report it using the clinical safety process
Serious harm needs assessment and escalation under clinical policy; the item gives no patient-specific treatment order.
40. A student evaluates drug effectiveness using only the absence of nausea. What additional information is essential?
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Answer: A. Whether the intended therapeutic outcome was achieved
Evaluation includes intended response as well as unwanted effects and relevant clinical data.
Frequently asked questions
Is this an official exam?
No. These are original, unofficial practice questions written by PocketLearn. They are not released exam items. This is a basic-concept review, not the full NCLEX test plan or clinical dosing guidance. Follow your program, current references and NCSBN materials.
How many questions are there?
40 multiple-choice questions in 6 topics. Each question has an explanation.
Is it free?
Yes. You can open the practice set without an account; signing in lets you save progress and review mistakes.
Can I use it on my phone?
It opens in a mobile browser. A laptop or tablet is easier for longer sets.