NAPLEX Exam Flashcards

Q: How many questions are on the NAPLEX?

The NAPLEX contains 225 questions total: 200 scored and 25 unscored pretest questions. You have 6 hours to complete the exam at a Pearson VUE test center. The exam ends when time expires or when you have answered the minimum number of questions required for scoring.

Q: What domains does the NAPLEX content outline cover?

The NABP NAPLEX blueprint has 5 domains: Foundational Knowledge for Pharmacy Practice (25%), Medication Use Process (25%), Person-Centered Assessment and Treatment Planning (40%), Professional Practice (5%), and Pharmacy Management and Leadership (5%). Person-Centered Assessment is the largest domain at 40%.

Q: What is the NAPLEX pass rate?

The NAPLEX first-time pass rate is approximately 86.8% for 2025 graduates of ACPE-accredited pharmacy schools (NABP report dated February 2, 2026). Pass rates vary by school and preparation level. The exam is computer-based and assesses competence to practice pharmacy.

Q: How much does the NAPLEX cost in 2026?

The NAPLEX costs a $100 application fee plus a $520 exam fee ($620 total), not including any board-specific licensing fees. You apply through your board of pharmacy and NABP after graduating from an ACPE-accredited US pharmacy school or completing an approved foreign equivalency pathway.

Q: What happens if I fail the NAPLEX?

After a failed attempt, candidates must wait 45 days before retaking. There are no more than three attempts in 12 months and no more than five total attempts per board policy. Review your performance report to identify weak areas before retaking, and most states require passing within a set timeframe after graduation.

Q: How should I study for the NAPLEX?

Allocate time by blueprint weight, prioritizing the 40% Person-Centered Assessment domain. Master pharmaceutical calculations, major drug interactions (warfarin, statins, MAOIs), disease-state management (diabetes, hypertension, heart failure, asthma/COPD, infectious disease), biostatistics, and pharmacy law including USP / .

Question 1

Volume of Distribution (Vd)

Accepted Answer

A proportionality constant relating the total amount of drug in the body to the plasma concentration. Highly lipophilic drugs have a high Vd (distribute into adipose/tissues); hydrophilic drugs stay in plasma with a lower Vd.

Question 2

Clearance

Accepted Answer

The volume of blood or plasma completely cleared of drug per unit time by all eliminating organs (primarily liver and kidneys). It measures the efficiency of drug removal, distinct from Vd and half-life.

Question 3

Time to Steady State

Accepted Answer

It takes about 5 half-lives to reach steady state with continuous dosing. After 1 half-life ~50%, after 3 ~87.5%, after 5 ~97%. At steady state the rate of administration equals the rate of elimination.

Question 4

Zero-Order vs First-Order Elimination

Accepted Answer

Zero-order: a constant amount is eliminated per unit time (saturated mechanism — e.g., phenytoin at high levels, ethanol). First-order: a constant fraction is eliminated per unit time, which most drugs follow at therapeutic concentrations.

Question 5

Henderson-Hasselbalch (pH = pKa)

Accepted Answer

When pH equals pKa, a drug exists 50% ionized and 50% unionized. Unionized forms cross membranes more easily, so this ratio governs absorption and distribution.

Question 6

Pharmacodynamics vs Pharmacokinetics

Accepted Answer

Pharmacodynamics = what the drug does to the body (receptor effect, agonism/antagonism, efficacy, potency). Pharmacokinetics = what the body does to the drug (absorption, distribution, metabolism, excretion).

Question 7

Full vs Partial Agonist

Accepted Answer

A full agonist can produce a maximal response while occupying only some receptors (spare receptors, high efficacy). A partial agonist cannot reach a maximal response even at full receptor occupancy.

Question 8

CYP3A4

Accepted Answer

The most abundant hepatic cytochrome P450 enzyme, metabolizing roughly 50% of clinically used drugs (many statins, immunosuppressants, calcium channel blockers, benzodiazepines). Highly susceptible to induction and inhibition interactions.

Question 9

Codeine and CYP2D6

Accepted Answer

Codeine is a prodrug converted to morphine by CYP2D6. In CYP2D6 poor metabolizers, analgesic efficacy is reduced. Morphine, oxycodone, and hydromorphone do not require CYP2D6 activation.

Question 10

HLA-B*57:01 Screening

Accepted Answer

Required before starting abacavir; positive patients are at high risk for severe, potentially fatal hypersensitivity. (Compare: HLA-B*15:02 before carbamazepine in certain Asian populations; CYP2C19 for clopidogrel.)

Question 11

Noyes-Whitney Equation

Accepted Answer

Dissolution rate is directly proportional to surface area. Smaller particle size and micronization increase dissolution; larger particles and hydrophobicity slow it. Basis for many bioavailability-enhancing formulations.

Question 12

Clinical Trial Phases

Accepted Answer

Phase I: safety/PK in healthy volunteers. Phase II: efficacy and side effects in small patient groups. Phase III: large studies confirming efficacy vs standard care. Phase IV: post-marketing long-term and rare-event surveillance.

Question 13

Prescription Frequency Abbreviations

Accepted Answer

QD = daily, BID = twice daily, TID (ter in die) = three times daily, QID = four times daily, Q4H = every 4 hours. Misreading these causes dosing errors; for TID x 10 days dispense 30 doses.

Question 14

Route/Timing Latin Abbreviations

Accepted Answer

OD = right eye, OS = left eye, OU = both eyes; AD/AS/AU = right/left/both ears; gtt = drop. ac = before meals, pc = after meals, hs = at bedtime, prn = as needed.

Question 15

DEA Controlled Substance Schedules

Accepted Answer

Schedule I: high abuse, no accepted US medical use (heroin, LSD). Schedule II: high abuse with accepted use (morphine, oxycodone). Schedules III-V: decreasing abuse potential with accepted uses.

Question 16

Controlled Substance Rx Expiration

Accepted Answer

Under federal law, Schedule III-V prescriptions are valid for 6 months from issuance with up to 5 refills. Schedule II prescriptions have no federal expiration but must be filled within a reasonable time.

Question 17

Schedule II Quantity Requirement

Accepted Answer

Required elements include patient, drug, strength, form, quantity, directions, prescriber info, DEA number, signature, and date. For Schedule II, the quantity should be written both numerically and alphabetically.

Question 18

Insulin Syringe Calibration

Accepted Answer

U-100 syringes are calibrated for 100 units/mL insulin; using the wrong syringe causes dangerous dosing errors. U-40 (40 units/mL) is uncommon in the US. Oral syringes are never used for insulin injection.

Question 19

REMS (Risk Evaluation and Mitigation Strategy)

Accepted Answer

Required for drugs with serious safety concerns to ensure benefits outweigh risks. Example: isotretinoin iPLEDGE requires prescriber certification, monthly pregnancy testing for childbearing-potential patients, and pharmacy verification before dispensing.

Question 20

Class III Prescription Balance

Accepted Answer

A mechanical (torsion) Class III balance has a 6 mg sensitivity requirement and must be certified annually. For quantities under ~120 mg, a more sensitive analytical balance is preferred for compounding accuracy.

Question 21

USP <797> Personnel Competency

Accepted Answer

Sterile compounding requires initial competency validation and annual re-evaluation: hand hygiene/garbing, aseptic technique (media-fill testing), and didactic knowledge. Reassess when deficiencies are seen or new procedures are introduced.

Question 22

Therapeutic Duplication

Accepted Answer

Two agents from the same therapeutic class/mechanism prescribed together (e.g., an ACE inhibitor plus an ARB), adding risk (hyperkalemia, renal dysfunction) without added benefit. Contact the prescriber to clarify and discontinue one.

Question 23

Comprehensive Medication Reconciliation

Accepted Answer

Gather all prescriptions, OTC products, supplements, herbals, and allergies (the brown-bag review). Community pharmacy records typically give the most accurate current list; combine sources for the best reconciliation.

Question 24

Beers Criteria / STOPP

Accepted Answer

Tools identifying potentially inappropriate medications in older adults. The Medication Appropriateness Index (MAI) assesses indication, dose, directions, interactions, duplication, duration, and cost.

Question 25

Diabetes Add-On Therapy (ADA)

Accepted Answer

Add a second agent if A1C stays above target after ~3 months on maximum tolerated metformin. With ASCVD, heart failure, or CKD, SGLT2 inhibitors or GLP-1 agonists are preferred for their organ-protective benefits.

Question 26

HFrEF Guideline-Directed Medical Therapy

Accepted Answer

GDMT for reduced-EF heart failure: ACE inhibitor/ARB/ARNI, an evidence-based beta-blocker (carvedilol, metoprolol succinate, bisoprolol), a mineralocorticoid receptor antagonist, and an SGLT2 inhibitor as foundational therapy.

Question 27

Persistent Asthma Control

Accepted Answer

Daily short-acting beta-agonist use signals poor control. Persistent asthma needs a daily controller (inhaled corticosteroid or ICS/LABA); the SABA is for PRN rescue only. Frequent SABA use raises exacerbation and mortality risk.

Question 28

GOLD COPD Staging

Accepted Answer

By post-bronchodilator FEV1: GOLD 1 (>=80%), 2 (50-79%), 3 (30-49%), 4 (<30%). The ABCD grouping (symptoms + exacerbation history) guides initial pharmacologic therapy; all COPD patients receive a bronchodilator.

Question 29

CHA2DS2-VASc and Anticoagulation

Accepted Answer

Atrial fibrillation stroke-risk score: oral anticoagulation is recommended at >=2 in men or >=3 in women. DOACs (apixaban, rivaroxaban, dabigatran, edoxaban) are preferred over warfarin for most non-valvular AF.

Question 30

Metformin and Renal Function

Accepted Answer

Allowed down to an eGFR of 30 mL/min/1.73m2; max 1000 mg/day at eGFR 30-45; contraindicated below eGFR 30. Glycemic-control benefits often outweigh risks with dose adjustment and monitoring.

Question 31

Naloxone vs Naltrexone

Accepted Answer

Naloxone is the acute opioid-overdose antidote (IM/IV/SC or intranasal) that reverses respiratory depression by competing at opioid receptors. Naltrexone is for maintenance treatment of alcohol/opioid dependence, not acute reversal.

Question 32

Acetaminophen Overdose Antidote

Accepted Answer

N-acetylcysteine (NAC) replenishes glutathione and binds toxic metabolites. Most effective within 8 hours; treatment is guided by the Rumack-Matthew nomogram (level vs time since ingestion).

Question 33

Phenytoin Toxicity

Accepted Answer

Nystagmus, ataxia, and slurred speech are classic signs. Phenytoin shows zero-order (saturable) kinetics at therapeutic levels (range 10-20 mcg/mL), so small dose increases can cause large concentration jumps.

Question 34

Vancomycin AUC-Guided Dosing

Accepted Answer

Current guidelines recommend AUC-guided dosing (target AUC/MIC 400-600) rather than trough-only monitoring, optimizing efficacy while reducing nephrotoxicity, often using Bayesian software.

Question 35

Anti-TB Drug Adverse Effects

Accepted Answer

Rifampin: orange-red body fluids and potent CYP induction. Isoniazid: peripheral neuropathy (give pyridoxine). Ethambutol: optic neuritis. Pyrazinamide: hyperuricemia.

Question 36

Levothyroxine Absorption Interactions

Accepted Answer

Calcium, iron, magnesium, and aluminum products bind levothyroxine in the GI tract and reduce absorption; separate by at least 4 hours. Coffee, soy, and high-fiber diets also reduce absorption.

Question 37

Warfarin + Amiodarone / TMP-SMX

Accepted Answer

Amiodarone inhibits CYP2C9/1A2 and displaces warfarin from protein, raising INR — reduce warfarin ~30-50% and monitor. TMP-SMX similarly inhibits CYP2C9 and displaces warfarin, increasing bleeding risk.

Question 38

Grapefruit Juice Interaction

Accepted Answer

Grapefruit inhibits intestinal CYP3A4 and P-glycoprotein, increasing exposure to CYP3A4 substrates (atorvastatin, simvastatin, cyclosporine, some CCBs). The effect can persist 24-72 hours.

Question 39

MAOI + Tyramine (Hypertensive Crisis)

Accepted Answer

Aged cheeses, aged/cured meats, fermented soy, draft beer, and wine are high in tyramine; with MAOIs this can trigger a hypertensive crisis because gut MAO-A normally degrades tyramine.

Question 40

Serotonin Syndrome Risk Combinations

Accepted Answer

Excess serotonergic activity (e.g., tramadol + SNRI, MAOI + SSRI, St. John's wort + serotonergic drugs) causes mental status change, autonomic instability, and neuromuscular signs (clonus, hyperreflexia, rigidity).

Question 41

MAOI Washout Period

Accepted Answer

Serotonergic antidepressants are contraindicated within 14 days of MAOI discontinuation. Fluoxetine needs a 5-week washout before an MAOI because of its long half-life.

Question 42

Macrolide + Digoxin

Accepted Answer

Clarithromycin and erythromycin inhibit P-glycoprotein, increasing digoxin levels 2-3 fold. Reduce digoxin ~50% when starting these macrolides, or switch to azithromycin (less P-gp inhibition).

Question 43

Cation Chelation of Quinolones

Accepted Answer

Magnesium, aluminum, calcium, iron, and zinc chelate fluoroquinolones, cutting absorption 50-90%. Separate by at least 2 hours (4 hours for iron). Tetracyclines and bisphosphonates have the same issue.

Question 44

Aspirin/NSAIDs With Warfarin

Accepted Answer

Aspirin and NSAIDs raise bleeding risk with warfarin via platelet inhibition and GI injury. Acetaminophen is the safer analgesic choice, though high doses may slightly increase INR.

Question 45

FDA MedWatch vs VAERS

Accepted Answer

MedWatch is the FDA program for adverse events, medication errors, and product-quality problems with drugs, biologics, and devices. VAERS is specifically for vaccine adverse events. Reporting is voluntary for clinicians and patients.

Question 46

Antimicrobial Stewardship

Accepted Answer

Optimizes antimicrobial use through appropriate selection, dose, duration, and route to improve outcomes, slow resistance, reduce adverse effects (C. difficile), and control cost — without eliminating necessary antibiotic use.

Question 47

Pharmacist Scope of Practice

Accepted Answer

Pharmacists generally cannot diagnose or prescribe (except via collaborative practice or protocol). Recommending prescription therapy without evaluation exceeds scope; refer to a licensed prescriber.

Question 48

High-Alert Medications (ISMP)

Accepted Answer

Drugs with heightened harm risk when errors occur: anticoagulants, insulin, opioids, chemotherapy, neuromuscular blockers, concentrated electrolytes. Safeguards include limited access, independent double-checks, and standardized protocols.

Question 49

FDA Recall Classifications

Accepted Answer

Class I: reasonable probability of serious harm or death (immediate removal). Class II: remote probability of reversible adverse effects. Class III: not likely to cause adverse effects. Pharmacists must identify and remove affected stock.

Question 50

Inventory Turnover Rate

Accepted Answer

Inventory turnover = Cost of goods sold / Average inventory. Higher turnover usually indicates efficient inventory management, but excessively high turnover can signal stockouts. ABC analysis prioritizes counting by item value.

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