Free NAPLEX Practice Test: 100 Questions With Answers and Rationales

Correct answer: C. Calcium carbonate binds levothyroxine in the gut and lowers absorption. The levothyroxine labeling says to take it at least 4 hours before or after products containing calcium carbonate or iron. Taking levothyroxine on an empty stomach in the morning and calcium later in the day fixes the problem without dropping the supplement.

Why the other options are wrong:

• A: Food and calcium both reduce levothyroxine absorption; this makes the problem worse.
• B: One hour does not meet the labeled 4-hour separation.
• D: Stopping calcium is unnecessary. Spacing the doses solves the interaction, and she may need the calcium.

Remember: Levothyroxine: empty stomach, then 4 hours away from calcium carbonate or iron.

Source: Levoxyl (levothyroxine) patient information, Pfizer — How should I take LEVOXYL?

Correct answer: 300 mL. 500 mg ÷ (250 mg/5 mL) = 10 mL per dose. 10 mL × 3 doses/day × 10 days = 300 mL.

Remember: Convert the dose to a volume first, then multiply by doses per day and days.

Source: Worked calculation from the values in the question.

Correct answer: C. Entresto contains sacubitril, a neprilysin inhibitor, and valsartan, an angiotensin II receptor blocker. Together they form the ARNI class used in heart failure.

Why the other options are wrong:

• A: No marketed product pairs sacubitril with amlodipine.
• B: Valsartan/HCTZ is Diovan HCT, not Entresto.
• D: Ivabradine is Corlanor, a separate heart failure drug.

Remember: Entresto = sacubitril + valsartan = ARNI.

Source: Entresto prescribing information (DailyMed) — Title and Section 1, Indications

Correct answer: A. When no monograph or preparation-specific stability data exist, USP <795> sets default BUD limits by type of preparation. A preserved aqueous dosage form (water activity ≥0.60) is limited to 35 days, stored at controlled room temperature or in a refrigerator.

Why the other options are wrong:

• B: 14 days (refrigerated) is the limit for a NONpreserved aqueous dosage form.
• C: 90 days is the limit for a nonaqueous oral liquid (water activity <0.60).
• D: 180 days is the limit for other nonaqueous dosage forms, such as capsules or suppositories.

Remember: USP <795> defaults: nonpreserved aqueous 14 d (fridge) · preserved aqueous 35 d · nonaqueous oral liquid 90 d · other nonaqueous 180 d.

Source: USP <795> beyond-use date limits (USP slides hosted by NABP) — Slides 19-20, BUD table

Correct answer: B. CDC recommends 2 doses of recombinant zoster vaccine for immunocompetent adults aged 50 and older, separated by 2 to 6 months. If more than 6 months pass, give the second dose as soon as possible; do not restart the series.

Why the other options are wrong:

• A: Shingrix is a 2-dose series.
• C: A 1-2 month interval can be used for people who are or will be immunocompromised, not routinely for this patient.
• D: 12 months is outside the recommended window.

Remember: Shingrix: 2 doses, 2-6 months apart, age 50+ (or 19+ if immunocompromised).

Source: CDC, Shingles Vaccine Recommendations — Routine recommendations

Correct answer: C, D, F. The 2022 AHA/ACC/HFSA heart failure guideline lists nondihydropyridine calcium channel blockers (diltiazem, verapamil), thiazolidinediones (pioglitazone), and NSAIDs (naproxen) as harmful in HFrEF. Diltiazem is negatively inotropic, pioglitazone causes fluid retention, and NSAIDs promote sodium and water retention and worsen HF symptoms.

Why the other options are wrong:

• A: SGLT2 inhibitors such as empagliflozin are recommended in HFrEF; keep it.
• B: Sacubitril/valsartan is recommended HFrEF therapy; keep it.
• E: Carvedilol is an evidence-based beta-blocker for HFrEF; keep it.

Remember: In HFrEF, remember the 'harm' list: diltiazem/verapamil, TZDs, NSAIDs (plus class IC antiarrhythmics and dronedarone).

Source: 2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure — Section 7.3.7, drugs that may worsen HF

Correct answer: C. Metformin labeling lists severe renal impairment (eGFR below 30 mL/min/1.73 m²) as a contraindication because of lactic acidosis risk. RJ's eGFR is 24, so metformin should be stopped, and the team should choose another glucose-lowering option.

Why the other options are wrong:

• A: Continuing it ignores a labeled contraindication.
• B: Dose reduction does not remove a contraindication at eGFR <30.
• D: Contrast-related holds apply to patients who can otherwise take metformin; RJ cannot.

Remember: Metformin: contraindicated at eGFR <30; don't start at eGFR 30-45.

Source: Metformin hydrochloride tablets prescribing information (DailyMed) — Section 4, Contraindications; Section 2, renal dosing

Correct answer: 40 mL/min. CrCl = [(140 − age) × weight] ÷ (72 × SCr) × 0.85 for females. (140 − 72) × 60 = 4,080. 72 × 1.2 = 86.4. 4,080 ÷ 86.4 = 47.22. 47.22 × 0.85 = 40.14, which rounds to 40 mL/min.

Remember: Cockcroft-Gault: multiply by 0.85 for females, and use the weight the question tells you to use.

Source: Cockcroft DW, Gault MH. Nephron. 1976;16:31-41 — Original equation

Correct answer: A, B, C, D. The fluoroquinolone boxed warning covers disabling and potentially irreversible reactions, including tendinitis and tendon rupture, peripheral neuropathy, and CNS effects, plus possible exacerbation of muscle weakness in patients with myasthenia gravis.

Why the other options are wrong:

• E: QT prolongation is a labeled warning (Warnings and Precautions), not part of the boxed warning.

Remember: Fluoroquinolone box: tendons, nerves, CNS, myasthenia gravis.

Source: Levofloxacin tablets prescribing information (DailyMed) — Boxed Warning; Section 5

Correct answer: B. The ADA Standards of Care use an A1C of 6.5% or higher as a diagnostic criterion for diabetes (confirmed by repeat testing unless there is clear clinical diagnosis). An A1C of 5.7% to 6.4% indicates prediabetes.

Why the other options are wrong:

• A: 5.7% is the lower bound of the prediabetes range.
• C: 6.0% falls in the prediabetes range.
• D: 5.4% is below the prediabetes range.

Remember: A1C: <5.7 normal · 5.7-6.4 prediabetes · ≥6.5 diabetes.

Source: ADA Standards of Care in Diabetes—2026 (Diabetes Care, Supplement 1) — Section 2, Diagnosis and Classification

Correct answer: A. For ratios (hazard ratio, relative risk, odds ratio), 1 means no difference. A 95% confidence interval that crosses 1 means the data are consistent with no effect, so the result is not statistically significant at α = 0.05.

Why the other options are wrong:

• B: A point estimate of 0.91 suggests a 9% reduction, but the interval includes no effect, so significance is not shown.
• C: A ratio below 1 is not enough; the whole interval must exclude 1.
• D: 1.07 is only the upper limit of the interval, not the estimated effect.

Remember: Ratio CI includes 1 → not significant. Difference CI includes 0 → not significant.

Source: BMJ, Statistics at Square One — Chapters on confidence intervals

Correct answer: C. Clarithromycin is a strong CYP3A4 inhibitor. Simvastatin labeling contraindicates use with strong CYP3A4 inhibitors because simvastatin levels rise sharply and myopathy or rhabdomyolysis risk increases. If the macrolide is unavoidable, simvastatin is suspended for the course.

Why the other options are wrong:

• A: Lowering the dose does not make a contraindicated combination acceptable.
• B: The interaction is metabolic (enzyme inhibition), so separating doses does not help.
• D: Monitoring alone does not address a contraindication.

Remember: Simvastatin + strong CYP3A4 inhibitor (clarithromycin, itraconazole, ketoconazole, protease inhibitors) = contraindicated.

Source: Simvastatin tablets prescribing information (DailyMed) — Section 4, Contraindications; Section 7, Drug Interactions

Correct answer: D. Fentanyl patch labeling tells patients to fold patches so the sticky side sticks to itself and flush them. Fentanyl is on FDA's flush list for use when a take-back option isn't readily available, because a discarded patch can still kill a child or pet who finds it.

Why the other options are wrong:

• A: The trash method is for most medicines, but flush-list drugs like fentanyl patches should be flushed when take-back isn't available.
• B: Cutting exposes drug and does not prevent accidental exposure.
• C: Keeping unneeded opioids in the home creates misuse and exposure risk.

Remember: Fentanyl patch disposal: take-back first; if unavailable, fold sticky sides together and flush.

Sources:

• Fentanyl transdermal system patient instructions (DailyMed) — Instructions for Use, Disposing a Fentanyl Transdermal System
• FDA, Drug Disposal: FDA's Flush List for Certain Medicines — Flush list

Correct answer: C. Clopidogrel is a prodrug that relies on CYP2C19 to form its active metabolite. Its boxed warning states that poor metabolizers form less active metabolite, have a diminished antiplatelet effect, and prescribers should consider another platelet P2Y12 inhibitor.

Why the other options are wrong:

• A: Poor metabolizers form less, not more, active metabolite.
• B: Clopidogrel is a prodrug; that is why CYP2C19 matters.
• D: No labeled twice-daily regimen compensates for poor metabolism.

Remember: Clopidogrel + CYP2C19 poor metabolizer → weaker effect → consider prasugrel or ticagrelor.

Source: Plavix (clopidogrel) prescribing information (DailyMed) — Boxed Warning: Diminished antiplatelet effect in CYP2C19 poor metabolizers

Correct answer: B, C, D. Serotonin syndrome develops quickly (often within hours) after a serotonergic drug is added. Linezolid is a weak MAO inhibitor. Neuromuscular hyperactivity such as clonus, hyperreflexia, and tremor, along with agitation, diaphoresis, and hyperthermia, are the hallmark findings (the Hunter criteria focus on clonus).

Why the other options are wrong:

• A: Bradycardia with pinpoint pupils suggests opioid or cholinergic toxicity; serotonin syndrome typically causes tachycardia and dilated pupils.
• E: Lead-pipe rigidity with slow onset and reduced reflexes points to neuroleptic malignant syndrome.

Remember: Serotonin syndrome: fast onset, clonus and hyperreflexia. NMS: slow onset, rigidity, low reflexes.

Source: Boyer EW, Shannon M. The serotonin syndrome. N Engl J Med. 2005;352:1112-1120 — Clinical findings and Hunter criteria

Correct answer: 200 mL/h. 90 minutes = 1.5 hours. 300 mL ÷ 1.5 h = 200 mL/h.

Remember: Convert minutes to hours before dividing volume by time.

Source: Worked calculation from the values in the question.

Correct answer: A. MMR is a live attenuated vaccine, and its labeling lists pregnancy as a contraindication. A nonimmune pregnant patient should be vaccinated after delivery.

Why the other options are wrong:

• B: The risk of rubella does not override the contraindication to a live vaccine in pregnancy.
• C: There is no reduced-dose MMR regimen.
• D: Immune globulin does not make a live vaccine safe in pregnancy.

Remember: Live vaccines (MMR, varicella) are contraindicated in pregnancy.

Source: M-M-R II prescribing information (DailyMed) — Section 4, Contraindications

Correct answer: B, D, E. Acetylcysteine replenishes glutathione to prevent acetaminophen liver injury. Idarucizumab is a monoclonal antibody fragment that binds dabigatran. Protamine neutralizes heparin.

Why the other options are wrong:

• A: Flumazenil reverses benzodiazepines. The opioid antidote is naloxone.
• C: Vitamin K reverses warfarin, not factor Xa inhibitors. Andexanet alfa is labeled for apixaban and rivaroxaban reversal.

Remember: APAP-acetylcysteine · dabigatran-idarucizumab · heparin-protamine · warfarin-vitamin K · opioid-naloxone · benzo-flumazenil.

Sources:

• Acetadote (acetylcysteine) prescribing information — Section 1
• Praxbind (idarucizumab) prescribing information — Section 1
• Protamine sulfate prescribing information — Section 1
• Andexxa prescribing information — Section 1

Correct answer: B. Under an EUA, FDA may allow unapproved medical products, or unapproved uses of approved products, to be used during a declared emergency when legal criteria are met, including that known and potential benefits outweigh known and potential risks and there are no adequate, approved, available alternatives. It is not approval.

Why the other options are wrong:

• A: An EUA is not an approval; the product may later seek approval separately.
• C: Human trials require an Investigational New Drug (IND) application, not an EUA.
• D: EUAs have covered drugs, diagnostic tests, and devices, not only vaccines.

Remember: EUA ≠ approval. It is emergency permission tied to a declaration.

Source: FDA, Emergency Use Authorization — Overview

Correct answer: B. For rheumatoid arthritis, oral methotrexate is taken once weekly. Methotrexate labeling warns that serious toxic reactions, including death, have occurred when weekly regimens were taken daily by mistake. A 'daily' order needs clarification before dispensing.

Why the other options are wrong:

• A: Filling a probable daily-dosing error exposes the patient to fatal toxicity.
• C: Limiting the supply still allows daily overdosing.
• D: Leucovorin is a rescue agent, not a substitute for methotrexate.

Remember: Methotrexate for RA or psoriasis: once WEEKLY. A 'daily' order is a red flag.

Source: Methotrexate tablets prescribing information (DailyMed) — Boxed Warning; Section 2, Dosage

Correct answer: 5600 mg. Prescription product: 2 tablets × 4 doses = 8 tablets × 325 mg = 2,600 mg. OTC product: 2 tablets × 3 doses = 6 tablets × 500 mg = 3,000 mg. Total = 5,600 mg/day, which exceeds the 4,000 mg/day maximum in the combination product's labeling. This duplication should be resolved with the patient and prescriber.

Remember: Always add up acetaminophen from every prescription and OTC source.

Source: Hydrocodone bitartrate and acetaminophen tablets prescribing information (DailyMed) — Section 2 and hepatotoxicity warning

Correct answer: D. Dry cough is a known ACE inhibitor effect caused by bradykinin accumulation. It is a class effect, so another ACE inhibitor usually won't help. ARBs don't block bradykinin breakdown, so switching to an ARB is the usual fix.

Why the other options are wrong:

• A: Suppressing the cough treats the symptom while keeping its cause.
• B: The cough is a class effect of ACE inhibitors.
• C: Same problem as A: the cause continues.

Remember: ACE inhibitor cough → switch to an ARB. ACE inhibitor angioedema → avoid ACE inhibitors.

Sources:

• Lisinopril tablets prescribing information (DailyMed) — Section 6, Adverse Reactions (cough)
• 2025 AHA/ACC High Blood Pressure Guideline — Pharmacologic treatment, drug-class considerations

Correct answer: A. VAERS, co-managed by CDC and FDA, collects reports of adverse events after vaccination. Anyone can report, and a report does not have to prove the vaccine caused the event.

Why the other options are wrong:

• B: MedWatch covers drugs, biologics other than vaccines, and devices.
• C: The ISMP program collects medication errors, not vaccine adverse events.
• D: Boards regulate practice; they don't run national vaccine safety surveillance.

Remember: Vaccines → VAERS. Drugs and devices → MedWatch. Errors → ISMP MERP.

Sources:

• VAERS — About VAERS
• FDA MedWatch — Overview

Correct answer: C, D. Sublingual tablets and translingual spray act within minutes and are labeled for acute relief of angina, as well as for prevention just before activities that trigger it.

Why the other options are wrong:

• A: Patches are labeled for prevention of angina; their onset is too slow for an acute attack.
• B: Extended-release capsules are for prevention, not acute relief.
• E: Ointment is used for prevention, not acute relief.

Remember: Acute angina: SL tablet or spray. Patch, ointment, ER capsule: prevention only.

Sources:

• Nitrostat prescribing information (DailyMed) — Section 1
• Nitrolingual Pumpspray prescribing information (DailyMed) — Section 1
• Nitroglycerin transdermal system prescribing information (DailyMed) — Indications

Correct answer: A. FDA's Approved Drug Products with Therapeutic Equivalence Evaluations, the Orange Book, publishes therapeutic equivalence codes such as AB for small-molecule drug products.

Why the other options are wrong:

• B: The Purple Book covers licensed biological products, including biosimilars and interchangeables.
• C: Red Book is a drug pricing reference.
• D: The Pink Book is CDC's vaccine-preventable diseases reference.

Remember: Orange = generic equivalence. Purple = biologics. Pink = vaccines.

Source: FDA, Orange Book — Preface: therapeutic equivalence codes

Correct answer: C. For nonvalvular atrial fibrillation, warfarin labeling targets an INR of 2.0 to 3.0 (goal 2.5). LM's INR of 2.4 is in range today.

Why the other options are wrong:

• A: Below the labeled range; stroke protection is reduced.
• B: 2.5 to 3.5 is used for certain mechanical heart valves, not nonvalvular AF.
• D: Above the labeled range for any common indication; bleeding risk rises.

Remember: Warfarin INR 2-3 for AF and VTE.

Source: Warfarin sodium tablets prescribing information (DailyMed) — Section 2, Dosage and Administration

Correct answer: A. Sulfamethoxazole inhibits CYP2C9, the main pathway for the more potent S-warfarin, and warfarin labeling lists it among drugs that can increase warfarin's effect. The INR can rise within days, so the prescriber should consider a noninteracting antibiotic or plan an INR check during the course.

Why the other options are wrong:

• B: This is a well-documented interaction that raises bleeding risk.
• C: The interaction is metabolic, so dose spacing doesn't prevent it.
• D: Increasing warfarin would push the INR even higher.

Remember: TMP-SMX, fluconazole, metronidazole, and amiodarone all raise warfarin's effect.

Source: Warfarin sodium tablets prescribing information (DailyMed) — Section 7, Drug Interactions (CYP2C9 inhibitors; antibiotics)

Correct answer: A. Every biosimilar has been shown to have no clinically meaningful differences from its reference product. An interchangeable biosimilar meets additional requirements, so it may be substituted at the pharmacy without the prescriber's involvement, as state pharmacy laws allow.

Why the other options are wrong:

• B: Biologics don't have generics; biosimilars follow a different pathway.
• C: True of ALL biosimilars, so it isn't what interchangeability adds.
• D: The reference product is the original biologic the biosimilar is compared with.

Remember: Biosimilar = highly similar, no meaningful differences. Interchangeable = pharmacy-level substitution allowed (state law).

Source: FDA, Biosimilar and Interchangeable Biologics: More Treatment Choices — Interchangeable products

Correct answer: 73 kg. Devine IBW for males = 50 kg + 2.3 kg for each inch over 5 feet. 5 ft 10 in is 10 inches over 5 feet: 50 + (2.3 × 10) = 73 kg.

Remember: IBW: male 50 kg, female 45.5 kg, plus 2.3 kg per inch over 5 feet.

Source: Pai MP, Paloucek FP. The origin of the 'ideal' body weight equations. Ann Pharmacother. 2000 — Devine equation

Correct answer: D. Alendronate is poorly absorbed and can irritate the esophagus. Labeling directs patients to take it on arising with a full glass of plain water, wait at least 30 minutes before food, other drinks, or medicines, and not lie down for at least 30 minutes.

Why the other options are wrong:

• A: Taking it at bedtime or lying down raises esophageal injury risk, and food blocks absorption.
• B: Coffee and juice reduce absorption; only plain water is allowed.
• C: Calcium binds alendronate; take calcium later in the day.

Remember: Alendronate: morning, plain water, upright 30 minutes, nothing else for 30 minutes.

Source: Fosamax (alendronate) prescribing information (DailyMed) — Section 2, Important Administration Instructions

Correct answer: D. Ceftriaxone labeling contraindicates its use in neonates 28 days old or younger who require, or are expected to require, calcium-containing IV solutions, because of fatal ceftriaxone-calcium precipitates in the lungs and kidneys. Changing lines, flushing, or route does not remove the contraindication in this age group.

Why the other options are wrong:

• A: Precipitates have occurred even with separate lines and times in neonates.
• B: Flushing is an option for patients older than 28 days, not neonates.
• C: The contraindication is not limited to the IV route.

Remember: Ceftriaxone + IV calcium in a neonate ≤28 days = contraindicated.

Source: Ceftriaxone for injection prescribing information (DailyMed) — Section 4, Contraindications; Warnings on calcium interaction

Correct answer: B. Oral nasal decongestants such as pseudoephedrine can raise blood pressure. Federal OTC labeling for these products tells consumers with high blood pressure, heart disease, thyroid disease, diabetes, or trouble urinating from an enlarged prostate to ask a doctor before use.

Why the other options are wrong:

• A: Saline spray has no systemic cardiovascular effect.
• C: Single-ingredient loratadine is an antihistamine without a decongestant. 'D' combination versions do contain pseudoephedrine.
• D: Guaifenesin is an expectorant without that warning.

Remember: Check the 'D' on combination products: it usually means pseudoephedrine.

Source: Pseudoephedrine hydrochloride OTC Drug Facts label (DailyMed) — Drug Facts: Warnings, Ask a doctor before use

Correct answer: D. Varivax labeling directs freezer storage (−50 °C to −15 °C). It may be kept in a refrigerator only for a limited time stated in the label, and then must be used or discarded.

Why the other options are wrong:

• A: Shingrix is refrigerated, not frozen.
• B: Tdap is refrigerated and must not be frozen.
• C: Inactivated influenza vaccines are refrigerated and must not be frozen.

Remember: Varivax: freezer. Most inactivated vaccines: refrigerator, never frozen.

Source: Varivax prescribing information (DailyMed) — Section 16, How Supplied/Storage and Handling

Correct answer: 72 %. Covered days: day 1-30 (30 days) + day 41-70 (30 days) + day 95-120 (26 days, because the period ends on day 120) = 86 days. PDC = 86 ÷ 120 = 71.7%, which rounds to 72%. That is below the 80% threshold commonly used in adherence quality measures.

Remember: PDC counts covered days in the window; supply that runs past the window's end doesn't count.

Source: Pharmacy Quality Alliance, adherence measures — Proportion of days covered

Correct answer: D. FDA's Drug Shortages Database lists current and resolved shortages, often with the reason and estimated resolution information supplied by manufacturers.

Why the other options are wrong:

• A: The Orange Book covers approvals and therapeutic equivalence, not supply status.
• B: The NDC Directory lists product identifiers, not shortage status.
• C: A representative can add detail but isn't the official national record.

Remember: Shortages: FDA Drug Shortages Database (ASHP also tracks shortages).

Source: FDA Drug Shortages Database — Current and resolved shortages

Correct answer: C. Extended-release nifedipine tablets are designed to release drug slowly. Labeling says to swallow them whole, not chew, divide, or crush, because crushing can release the full dose at once and cause profound hypotension.

Why the other options are wrong:

• A: Immediate-release lisinopril has no release-controlling design.
• B: Amlodipine is an immediate-release tablet.
• D: Metoprolol tartrate immediate-release is not a controlled-release product (metoprolol succinate ER is).

Remember: ER, XL, SR, CR, and enteric-coated products are the usual do-not-crush suspects.

Source: Procardia XL (nifedipine extended-release) prescribing information (DailyMed) — Section 2, Dosage and Administration

Correct answer: B. The ADA sets an A1C goal of less than 7% for many nonpregnant adults without significant hypoglycemia, with more or less stringent goals individualized to the patient.

Why the other options are wrong:

• A: 5.7% is the prediabetes cutoff, not a treatment goal.
• C: A universal <6.0% goal would raise hypoglycemia risk.
• D: Less stringent goals are for selected patients, not everyone.

Remember: Default A1C goal: <7%, individualized.

Source: ADA Standards of Care in Diabetes—2026 — Section 6, Glycemic Goals

Correct answer: C. Under the HIPAA Privacy Rule, a pharmacy may not disclose protected health information to an employer for employment purposes without the patient's authorization. Knowing identifying details does not make the caller authorized.

Why the other options are wrong:

• A: Paying for coverage does not give the employer access to a patient's records.
• B: No exception exists for controlled substances in this situation.
• D: Knowing a date of birth doesn't grant access.

Remember: Employer requests → no disclosure without the patient's authorization.

Source: HHS, Summary of the HIPAA Privacy Rule — Uses and disclosures; authorization

Correct answer: C. This looks like a vasovagal (fainting) reaction, which is common after injections, especially in adolescents. CDC advises having patients seated or lying down and considering 15 minutes of observation after vaccination; if syncope develops, observe until symptoms resolve.

Why the other options are wrong:

• A: Epinephrine is for anaphylaxis; she has no signs of it.
• B: Standing increases the risk of falling and injury.
• D: She should not leave or drive until she has recovered.

Remember: Fainting: sit or lie down and observe. Anaphylaxis signs: give epinephrine IM.

Source: CDC, General Best Practice Guidelines: Preventing and Managing Adverse Reactions — Syncope

Correct answer: D. FMEA is a proactive tool. The team maps a process, lists ways each step could fail, and ranks failures by severity and likelihood before harm occurs.

Why the other options are wrong:

• A: Root cause analysis looks back at an event that has already happened.
• B: A medication use evaluation reviews how a drug is being used against criteria.
• C: A Pareto chart ranks past problems; it doesn't analyze a process that hasn't started.

Remember: FMEA = before (prospective). RCA = after (retrospective).

Source: IHI, Failure Modes and Effects Analysis (FMEA) Tool — Tool overview

Correct answer: A. The pen's Instructions for Use tell patients to prime before each injection: dial 2 units, hold the pen needle-up, tap out air bubbles, and push until insulin appears. Priming removes air and confirms the pen and needle work.

Why the other options are wrong:

• B: Shaking is not a preparation step for this clear insulin; priming is.
• C: Priming is needed before every injection, including the first.
• D: Pens are not handled like vials; injecting air is not a pen step.

Remember: Pen routine: new needle, prime 2 units, inject, hold, remove needle.

Source: Humalog KwikPen Instructions for Use (DailyMed) — Instructions for Use, Priming

Correct answer: 1.5 g. 2.5% w/w means 2.5 g per 100 g. 60 g × 0.025 = 1.5 g.

Remember: % w/w = grams of ingredient per 100 g of product.

Source: Worked calculation from the values in the question.

Correct answer: D. Antidepressants such as sertraline carry a boxed warning that they increased the risk of suicidal thoughts and behaviors in pediatric and young adult patients in short-term studies. Patients should be monitored for worsening mood and emergence of suicidal thoughts.

Why the other options are wrong:

• A: Statins have no such boxed warning.
• B: PPIs have no boxed warning.
• C: ARBs carry a boxed warning for fetal toxicity, not suicidality.

Remember: Antidepressant box: suicidality in children, adolescents, and young adults.

Source: Sertraline tablets prescribing information (DailyMed) — Boxed Warning

Correct answer: D. The AGS Beers Criteria list first-generation antihistamines such as diphenhydramine as potentially inappropriate for older adults because they are highly anticholinergic. Risks include confusion, constipation, and urinary retention, which is a special concern with BPH.

Why the other options are wrong:

• A: Recommending the drug ignores the Beers Criteria and his BPH.
• B: A higher dose adds anticholinergic burden.
• C: Doxylamine is also a strongly anticholinergic first-generation antihistamine.

Remember: Older adults: avoid first-generation antihistamines (diphenhydramine, doxylamine, hydroxyzine).

Source: American Geriatrics Society 2023 Updated AGS Beers Criteria — Table 2, first-generation antihistamines

Correct answer: A, B, C, D. Warfarin blocks regeneration of reduced vitamin K, which the liver needs to activate factors II, VII, IX, and X (and the anticoagulant proteins C and S).

Why the other options are wrong:

• E: Factor XII is not vitamin K-dependent.
• F: Factor VIII is not vitamin K-dependent.

Remember: Vitamin K-dependent factors: 2, 7, 9, 10 (plus proteins C and S).

Source: Warfarin sodium tablets prescribing information (DailyMed) — Section 12.1, Mechanism of Action

Correct answer: B. GINA no longer recommends SABA-only treatment for adults and adolescents. Its preferred Track 1 approach for mild asthma is as-needed low-dose ICS-formoterol, which cuts severe exacerbation risk compared with SABA alone.

Why the other options are wrong:

• A: SABA-only treatment is linked with higher exacerbation risk and is not recommended.
• C: LABA monotherapy without an inhaled corticosteroid is unsafe in asthma.
• D: Montelukast is a less effective alternative, not the preferred option.

Remember: GINA: no SABA-only treatment in adults; ICS-formoterol as reliever is preferred.

Source: GINA 2026 Strategy Report — Track 1, Steps 1–2 treatment for adults and adolescents

Correct answer: B. For nonvalvular AF, apixaban labeling recommends 5 mg twice daily unless the patient has at least two of: age ≥80 years, weight ≤60 kg, or serum creatinine ≥1.5 mg/dL. She meets two (age and weight), so the dose is 2.5 mg twice daily.

Why the other options are wrong:

• A: The standard dose applies when fewer than two criteria are met.
• C: The 10 mg lead-in is for treating acute VTE, not AF.
• D: Apixaban is dosed twice daily for AF.

Remember: Apixaban AF dose reduction: 2 of 3 (age ≥80, weight ≤60 kg, SCr ≥1.5).

Source: Eliquis (apixaban) prescribing information (DailyMed) — Section 2, Dosage and Administration

Correct answer: 37.5 g. Alligation: the 10% ointment contributes 5 − 2 = 3 parts and the 2% ointment 10 − 5 = 5 parts, 8 parts total. 3/8 × 100 g = 37.5 g of the 10% ointment (and 62.5 g of the 2%). Check: (37.5 × 0.10 + 62.5 × 0.02) ÷ 100 = 5%.

Remember: Alligation: each strength's parts equal the distance of the OTHER strength from the target.

Source: Worked calculation from the values in the question.

Correct answer: A. ACE inhibitors carry a boxed warning for fetal toxicity: drugs acting on the renin-angiotensin system can injure and kill the developing fetus. Labeling says to discontinue as soon as possible when pregnancy is detected, so the prescriber needs to choose an alternative.

Why the other options are wrong:

• B: Lisinopril is not safe in pregnancy.
• C: Any dose carries the fetal risk.
• D: ARBs such as losartan carry the same fetal toxicity boxed warning.

Remember: ACE inhibitors, ARBs, and aliskiren: stop when pregnancy is detected.

Source: Lisinopril tablets prescribing information (DailyMed) — Boxed Warning: Fetal Toxicity

Correct answer: B, C, E. Rivastigmine (for dementia), clonidine (for hypertension), and fentanyl (for opioid-tolerant chronic pain) all come as transdermal systems.

Why the other options are wrong:

• A: Amlodipine is oral only.
• D: Metoprolol is available orally and IV, not as a patch.

Remember: Know common patches: rivastigmine, clonidine, fentanyl, buprenorphine, nitroglycerin, scopolamine, estradiol, rotigotine.

Sources:

• Rivastigmine transdermal system prescribing information (DailyMed) — Dosage forms
• Clonidine transdermal system prescribing information (DailyMed) — Dosage forms
• Fentanyl transdermal system prescribing information (DailyMed) — Dosage forms

Correct answer: D. Phenelzine is a monoamine oxidase inhibitor (MAOI). With MAO blocked, tyramine from aged, fermented, or cured foods isn't broken down and can trigger a dangerous release of norepinephrine and a hypertensive crisis. MAOI labeling tells patients to avoid high-tyramine foods.

Why the other options are wrong:

• A: Serotonin syndrome is a risk with serotonergic drugs, not tyramine-rich food.
• B: Tyramine does not cause hypoglycemia.
• C: The concern is a pharmacodynamic reaction, not absorption.

Remember: MAOI + tyramine (aged cheese, cured meats, tap beer, soy sauce) = hypertensive crisis.

Source: Nardil (phenelzine) prescribing information (DailyMed) — Warnings: hypertensive crises; dietary restrictions

Correct answer: D. Under FDA regulations (21 CFR 312), a sponsor must have an IND in effect before giving an investigational drug to humans in a clinical investigation. The NDA, ANDA, and BLA are marketing applications submitted later.

Why the other options are wrong:

• A: An NDA seeks marketing approval after clinical studies.
• B: An ANDA is for generic drug approval.
• C: A BLA seeks licensure to market a biologic.

Remember: IND = permission to study in humans. NDA/BLA = permission to market. ANDA = generics.

Source: FDA, Investigational New Drug (IND) Application — Overview

Correct answer: D. Spironolactone is a potassium-sparing aldosterone antagonist. Its labeling warns of hyperkalemia, especially with impaired kidney function, and advises checking potassium before starting and periodically after.

Why the other options are wrong:

• A: Sodium can change but isn't the key safety value here.
• B: A1C isn't related to spironolactone's main risk.
• C: Cholesterol isn't related to spironolactone's main risk.

Remember: Spironolactone, eplerenone, ACE inhibitors, ARBs: watch potassium and kidney function.

Source: Spironolactone tablets prescribing information (DailyMed) — Section 5, Hyperkalemia

Correct answer: C. FDA has warned that biotin can interfere with lab tests that use biotin-streptavidin technology, causing falsely high or falsely low results. A falsely low troponin could lead to a missed heart attack.

Why the other options are wrong:

• A: Biotin is not known to cause vasospasm.
• B: Biotin doesn't alter coagulation.
• D: Biotin doesn't raise potassium.

Remember: Ask about biotin when immunoassay results (troponin, thyroid tests) don't fit the clinical picture.

Source: FDA Safety Communication: Biotin may interfere with lab tests (updated 2019) — Summary

Correct answer: 20 mEq. 14.9% w/v = 14.9 g per 100 mL, so 10 mL contains 1.49 g KCl. 1.49 g ÷ 74.55 g/mol = 0.01999 mol = 19.99 mmol. KCl has a valence of 1, so mmol = mEq: about 20 mEq.

Remember: mEq = (mg ÷ molecular weight) × valence.

Source: Worked calculation from the values in the question.

Correct answer: B. The 5 A's are Ask, Advise, Assess, Assist, and Arrange. 'Arrange' means scheduling follow-up, preferably soon after the quit date, to support the attempt and address relapse.

Why the other options are wrong:

• A: This has nothing to do with the 5 A's.
• C: Brief interventions start with the clinician, not an automatic referral.
• D: Reduction plans aren't what 'Arrange' refers to.

Remember: Ask · Advise · Assess · Assist · Arrange (follow-up).

Source: Treating Tobacco Use and Dependence: 2008 Update (USPHS Clinical Practice Guideline, NCBI Bookshelf) — The 5 A's

Correct answer: B. Sitagliptin blocks DPP-4, the enzyme that breaks down incretin hormones, which raises GLP-1 and GIP levels. The '-gliptin' ending marks DPP-4 inhibitors.

Why the other options are wrong:

• A: Semaglutide is a GLP-1 receptor agonist ('-glutide').
• C: Canagliflozin is an SGLT2 inhibitor ('-gliflozin').
• D: Pioglitazone is a thiazolidinedione ('-glitazone').

Remember: -gliptin DPP-4 · -glutide GLP-1 RA · -gliflozin SGLT2 · -glitazone TZD.

Source: Januvia (sitagliptin) prescribing information (DailyMed) — Section 12.1

Correct answer: D. Sildenafil labeling contraindicates use with any nitrate, taken regularly or as needed, because the combination can cause profound, potentially fatal hypotension.

Why the other options are wrong:

• A: Spacing doses does not prevent the interaction with a daily long-acting nitrate.
• B: Any dose is contraindicated with nitrates.
• C: Grapefruit is a minor issue compared with the contraindication.

Remember: PDE-5 inhibitors + nitrates (including as-needed NTG) = contraindicated.

Source: Viagra (sildenafil) prescribing information (DailyMed) — Section 4, Contraindications

Correct answer: D. Intention-to-treat keeps everyone in the group they were randomized to. That preserves the balance randomization created and gives a more realistic, conservative estimate of treatment effect.

Why the other options are wrong:

• A: That describes a completers (per-protocol-style) analysis.
• B: Excluding crossovers breaks randomization; it is a per-protocol approach.
• C: That is an as-treated analysis.

Remember: ITT: analyze as randomized. Per-protocol: analyze those who followed the protocol.

Source: Moher D, et al. CONSORT 2010 explanation and elaboration. BMJ. 2010;340:c869 — Item 16, numbers analysed

Correct answer: B. Therapeutic interchange means substituting a chemically different drug that is expected to have similar effects, under a policy approved by the organization's P&T committee and medical staff.

Why the other options are wrong:

• A: Generic substitution swaps a brand for a product with the same active ingredient.
• C: Off-label use means using a drug for an unapproved indication.
• D: Biosimilar substitution involves biologics, not small-molecule PPIs.

Remember: Same active ingredient = generic substitution. Different drug, same class, by P&T policy = therapeutic interchange.

Source: ASHP Guidelines on the Pharmacy and Therapeutics Committee and the Formulary System — Formulary system; therapeutic interchange

Correct answer: B. He has clinical atherosclerotic cardiovascular disease (a recent MI). The 2026 ACC/AHA multisociety dyslipidemia guideline recommends high-intensity statin therapy for adults with clinical ASCVD who are not at very high risk, aiming for at least a 50% LDL-C reduction and an LDL-C goal below 70 mg/dL; more intensive LDL-C goals apply to very-high-risk secondary prevention.

Why the other options are wrong:

• A: Moderate intensity is for patients who can't tolerate high intensity, not the first choice here.
• C: Niacin has not been shown to reduce events when added to statins.
• D: OTC fish oil is not a substitute for statin therapy.

Remember: Clinical ASCVD after MI: high-intensity statin therapy is foundational secondary prevention.

Source: 2026 ACC/AHA Multisociety Guideline on the Management of Dyslipidemia — Section 4.2.6, Secondary ASCVD Prevention

Correct answer: 850 kcal. 50% dextrose = 50 g per 100 mL, so 500 mL contains 250 g. 250 g × 3.4 kcal/g = 850 kcal.

Remember: Dextrose (hydrated) = 3.4 kcal/g. Lipid 20% emulsion = 2 kcal/mL. Protein = 4 kcal/g.

Source: Dextrose 50% injection prescribing information (DailyMed) — Description: caloric content

Correct answer: A. Shingrix is given as a 0.5 mL intramuscular injection, usually in the deltoid.

Why the other options are wrong:

• B: Subcutaneous is used for some live vaccines, but not Shingrix.
• C: Intradermal is not a labeled route for Shingrix.
• D: No zoster vaccine is given intranasally.

Remember: Shingrix: 0.5 mL IM, 2 doses.

Source: Shingrix prescribing information (DailyMed) — Section 2, Dosage and Administration

Correct answer: B. Gingival hyperplasia is a recognized adverse effect of long-term phenytoin. Labeling recommends good oral hygiene and regular dental care to reduce it.

Why the other options are wrong:

• A: Gum overgrowth is not an allergic reaction.
• C: This is a direct drug effect, not scurvy.
• D: Toxicity typically shows as nystagmus, ataxia, and slurred speech, not gum growth.

Remember: Phenytoin: gingival hyperplasia, hirsutism, nystagmus and ataxia at high levels.

Source: Dilantin (phenytoin) prescribing information (DailyMed) — Adverse Reactions; gingival hyperplasia

Correct answer: D. An MUE is a performance improvement method that evaluates how a medication is being used against defined criteria and then acts to improve use. It is proactive and focused on patterns of use.

Why the other options are wrong:

• A: Root cause analysis investigates a specific adverse event or error.
• B: ADE reporting documents individual events.
• C: This review is about how the drug is used, not whether to remove it.

Remember: MUE: compare real use with criteria, then fix the process.

Source: ASHP Guidelines on Medication-Use Evaluation — Definition and purpose of MUE

Correct answer: 12.5 %. 18 hours ÷ 6 hours = 3 half-lives. 100% → 50% → 25% → 12.5%.

Remember: Fraction remaining = (1/2)^(number of half-lives).

Source: Worked calculation from the values in the question.

Correct answer: A. Hives plus breathing symptoms after vaccination suggest anaphylaxis. CDC guidance says epinephrine is the first-line treatment and should be available wherever vaccines are given; emergency services should be called.

Why the other options are wrong:

• B: Antihistamines can help skin symptoms but don't treat airway or circulation compromise.
• C: Albuterol may be added but does not replace epinephrine.
• D: Delaying epinephrine in anaphylaxis is dangerous.

Remember: Anaphylaxis: epinephrine IM first, then call 911.

Source: CDC, General Best Practice Guidelines: Preventing and Managing Adverse Reactions — Managing allergic reactions

Correct answer: B. Gastrointestinal effects are common when metformin is started too aggressively. Immediate-release metformin labeling directs taking it with meals and starting at a lower dose with gradual titration to improve tolerability.

Why the other options are wrong:

• A: GI intolerance often improves with administration with meals and slower titration; permanent discontinuation is not automatically necessary when kidney function is normal.
• C: Immediate-release metformin should be taken with meals, not on an empty stomach.
• D: Doubling the dose would be expected to worsen GI intolerance.

Remember: Metformin IR: take with meals and titrate gradually rather than starting at a high dose.

Source: Metformin hydrochloride tablets prescribing information (DailyMed) — Section 2, Dosage and Administration

Correct answer: C. An unpaired t-test compares the means of a continuous, normally distributed variable between two independent groups.

Why the other options are wrong:

• A: Chi-square compares categorical (nominal) data, such as proportions.
• B: A paired t-test compares two measurements on the same subjects.
• D: Kaplan-Meier describes time-to-event (survival) data.

Remember: Two independent means, normal data → unpaired t-test. Proportions → chi-square.

Source: BMJ, Statistics at Square One — Chapter on the t tests

Correct answer: B. A severe allergic reaction (such as anaphylaxis) after a previous dose, or to a vaccine component, is a contraindication for that vaccine in CDC guidance.

Why the other options are wrong:

• A: Local soreness and low-grade fever are expected reactions, not contraindications.
• C: Mild illness without fever is not a reason to delay vaccination.
• D: Antibiotics are not a contraindication for most vaccines.

Remember: Prior anaphylaxis to the vaccine or a component = contraindication.

Source: CDC, General Best Practice Guidelines: Contraindications and Precautions — General contraindications

Correct answer: C. The acetaminophen nomogram starts at 4 hours after ingestion because levels drawn earlier may not reflect peak absorption. Acetylcysteine labeling directs drawing the level at 4 hours or later and using the nomogram to decide on treatment.

Why the other options are wrong:

• A: Levels before 4 hours can't be interpreted on the nomogram.
• B: Waiting 12 hours delays treatment decisions; the nomogram starts at 4 hours.
• D: For a single acute ingestion with a known time, the level is central to the decision.

Remember: APAP level: at 4 hours or later, then plot on the nomogram.

Source: Acetadote (acetylcysteine) prescribing information (DailyMed) — Section 2, Dosage and Administration; nomogram

Correct answer: B. Healthy People 2030's five SDOH domains are economic stability, education access and quality, health care access and quality, neighborhood and built environment, and social and community context.

Why the other options are wrong:

• A: Genetics affects health but is a biological factor, not a social determinant.
• C: Pharmacogenomics is also biological.
• D: Age is a biological and demographic factor, not an SDOH domain.

Remember: SDOH: economic, education, health care access, neighborhood, social context.

Source: Healthy People 2030, Social Determinants of Health — Five domains

Correct answer: 490 mg. Vd = 0.7 L/kg × 70 kg = 49 L. Loading dose = target concentration × Vd = 10 mg/L × 49 L = 490 mg.

Remember: Loading dose = Cp × Vd ÷ (F × S).

Source: Worked calculation from the values in the question.

Correct answer: B. Humalog labeling states that an in-use pen kept at room temperature (up to 86 °F / 30 °C) should be discarded 28 days after first use, even if insulin remains.

Why the other options are wrong:

• A: Too short for this product.
• C: Too short for this product; some other insulins have shorter in-use times.
• D: The printed date applies to unopened pens stored in the refrigerator.

Remember: In-use times differ by insulin product. Check each label.

Source: Humalog prescribing information (DailyMed) — Section 16, Storage and Handling

Correct answer: A, C, E. Naloxone labeling teaches caregivers to look for the signs of opioid overdose: unusual sleepiness or unresponsiveness, breathing problems (slow or shallow breathing), and very small pupils.

Why the other options are wrong:

• B: Opioids constrict the pupils. Dilated pupils point elsewhere, for example stimulant or anticholinergic toxicity.
• D: Fever with heavy sweating is more typical of serotonin syndrome or sympathomimetic toxicity.

Remember: Opioid overdose triad: unresponsive, slow breathing, pinpoint pupils.

Source: Narcan (naloxone) nasal spray labeling (DailyMed) — Quick Start Guide / Instructions for Use

Correct answer: A. Tall man lettering uses selective capital letters to highlight the parts of look-alike names that differ. ISMP publishes a list of drug name pairs for which it recommends this approach.

Why the other options are wrong:

• B: Barcode scanning is a separate technology-based safeguard.
• C: An independent double check is a second person verifying the work.
• D: Automatic stop orders end therapy after a set time.

Remember: Look-alike names: tall man lettering, separate storage, barcode scanning.

Source: ISMP, List of Confused Drug Names / Tall Man Letters — Tall man lettering list

Correct answer: A. Empagliflozin blocks SGLT2 in the proximal tubule. That reduces glucose reabsorption and lowers the renal threshold, so more glucose is excreted in the urine.

Why the other options are wrong:

• B: That describes sulfonylureas.
• C: That describes DPP-4 inhibitors such as sitagliptin.
• D: That is the main action attributed to metformin.

Remember: SGLT2 inhibitors: glucose out in the urine (watch genital infections and volume depletion).

Source: Jardiance (empagliflozin) prescribing information (DailyMed) — Section 12.1, Mechanism of Action

Correct answer: C. Methotrexate is an antineoplastic and immunosuppressant with carcinogenic, teratogenic, and other hazardous properties. It appears on the NIOSH hazardous drug list, so handling precautions apply.

Why the other options are wrong:

• A: Acetaminophen is not on the NIOSH list.
• B: Amoxicillin is not on the NIOSH list.
• D: Famotidine is not on the NIOSH list.

Remember: Many antineoplastics, some hormones, and certain teratogens are NIOSH hazardous drugs.

Source: NIOSH List of Hazardous Drugs in Healthcare Settings, 2024 — Table 1

Correct answer: A, C, E, F. Too little thyroid hormone slows metabolism, causing fatigue, feeling cold, weight gain, constipation, dry skin, and slowed thinking.

Why the other options are wrong:

• B: Tremor points to hyperthyroidism.
• D: Heat intolerance points to hyperthyroidism.

Remember: Hypo = slow and cold. Hyper = fast and hot.

Source: NIDDK, Hypothyroidism (Underactive Thyroid) — Symptoms

Correct answer: 25 %. Absolute risk reduction = 20% − 15% = 5%. Relative risk reduction = ARR ÷ control event rate = 5% ÷ 20% = 25%. (Equivalently, RR = 15/20 = 0.75, and RRR = 1 − 0.75 = 0.25.)

Remember: RRR = ARR ÷ control rate. NNT = 1 ÷ ARR.

Source: Worked calculation from the values in the question.

Correct answer: A. Dabigatran capsules are sensitive to moisture. Labeling says to keep them in the original bottle or blister, close the bottle tightly, and discard capsules remaining 4 months after first opening the bottle.

Why the other options are wrong:

• B: Pill organizers expose capsules to moisture.
• C: Refrigeration isn't the labeled storage.
• D: Opening capsules can greatly increase absorption and bleeding risk; labeling says to swallow them whole.

Remember: Dabigatran: original container, 4 months after opening, swallow whole.

Source: Pradaxa (dabigatran) prescribing information (DailyMed) — Section 16 and Section 2

Correct answer: A. The ADA Standards of Care in Diabetes—2026 recommend treating hypoglycemia at 70 mg/dL or less with fast-acting carbohydrate. For most individuals, 15 g of carbohydrate is the initial treatment; glucose should be rechecked 15 minutes later and treatment repeated if hypoglycemia persists.

Why the other options are wrong:

• B: Fat and protein in a large meal slow correction.
• C: Insulin would lower glucose further.
• D: Delaying treatment risks severe hypoglycemia.

Remember: For most alert patients: 15 g fast carbohydrate, recheck in 15 minutes, repeat if still low.

Source: ADA Standards of Care in Diabetes—2026: Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises — Hypoglycemia Treatment

Correct answer: A. LactMed, from the National Library of Medicine, summarizes data on drug levels in breast milk and infant blood, possible effects on breastfed infants, and alternatives.

Why the other options are wrong:

• B: The Orange Book covers approvals and equivalence ratings.
• C: ClinicalTrials.gov is a registry of studies, not a summary of lactation data.
• D: VAERS is a vaccine adverse event reporting system.

Remember: Lactation questions: LactMed.

Source: Drugs and Lactation Database (LactMed), NCBI Bookshelf — About LactMed

Correct answer: A. Oseltamivir labeling lists 75 mg twice daily for 5 days to treat influenza in adults and adolescents 13 and older. 75 mg once daily is the prophylaxis dose.

Why the other options are wrong:

• B: Once daily is the prophylaxis schedule (typically for 10 days after exposure).
• C: This is not a labeled regimen.
• D: 30 mg doses are used for small children or renal adjustment.

Remember: Oseltamivir: treatment 75 mg BID × 5 days; prophylaxis 75 mg daily.

Source: Tamiflu (oseltamivir) prescribing information (DailyMed) — Section 2, Dosage and Administration

Correct answer: C. The Joint Commission's goal on medication information (NPSG.03.06.01) calls for obtaining the patient's current medications and comparing them with those ordered, so omissions, duplications, dosing errors, and interactions can be resolved.

Why the other options are wrong:

• A: Coverage checks are not reconciliation.
• B: Controlled substance counts are an inventory control.
• D: Cost review is a formulary activity.

Remember: Reconciliation: collect the list, compare with new orders, resolve differences, communicate the updated list.

Source: The Joint Commission, National Patient Safety Goals — NPSG.03.06.01

Correct answer: B. Drug absorbed under the tongue enters the systemic circulation directly and largely bypasses the portal circulation. That is why sublingual nitroglycerin works quickly even though oral nitroglycerin undergoes extensive first-pass metabolism.

Why the other options are wrong:

• A: Swallowed drugs pass through the liver via the portal vein first.
• C: An oral solution is still absorbed from the GI tract into the portal circulation.
• D: Enteric coating changes where the drug is released, not whether it passes the liver.

Remember: Bypass first pass: sublingual, buccal, IV, transdermal, inhaled.

Source: Nitrostat prescribing information (DailyMed) — Section 12.3, Pharmacokinetics

Correct answer: D. Opioid labeling carries a boxed warning that concomitant use with benzodiazepines or other CNS depressants can cause profound sedation, respiratory depression, coma, and death. Use together should be limited to patients without alternatives, at the lowest doses and shortest durations.

Why the other options are wrong:

• A: Serotonin syndrome is not the boxed risk for this combination.
• B: The combination lowers, not raises, respiratory and CNS function.
• C: Hepatotoxicity is not the risk named in this warning.

Remember: Opioid + benzodiazepine = respiratory depression box. Coordinate with prescribers; consider naloxone.

Source: Oxycodone hydrochloride tablets prescribing information (DailyMed) — Boxed Warning

Correct answer: C. The 2025 guideline kept the 2017 categories: normal <120/<80, elevated 120-129/<80, stage 1 130-139 or 80-89, and stage 2 ≥140 or ≥90. A systolic value of 134 puts this reading in stage 1, even though the diastolic value is under 80. A diagnosis still requires confirmation across visits or with out-of-office readings.

Why the other options are wrong:

• A: Systolic 134 is above the normal range.
• B: Elevated requires systolic 120-129.
• D: Stage 2 requires ≥140 systolic or ≥90 diastolic.

Remember: Classify by the higher category of systolic or diastolic.

Source: 2025 AHA/ACC Guideline for the Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults — BP classification

Correct answer: C. Autonomy is respect for a capable person's right to make informed decisions about their own care. The APhA Code of Ethics states that a pharmacist respects the autonomy and dignity of each patient.

Why the other options are wrong:

• A: Beneficence is acting for the patient's good, which here might argue for the statin.
• B: Justice concerns fair distribution of resources and care.
• D: Nonmaleficence is avoiding harm.

Remember: Informed refusal by a capable adult = autonomy.

Source: APhA Code of Ethics for Pharmacists — Principle II

Correct answer: C. Thiazide diuretics reduce renal lithium clearance, which raises lithium levels. Lithium labeling warns of this interaction; if the combination is used, levels should be monitored closely and the lithium dose may need to be lowered.

Why the other options are wrong:

• A: The change goes the other way.
• B: This is a well-known, clinically significant interaction.
• D: Lithium, not the diuretic, is the drug affected.

Remember: Thiazides, ACE inhibitors, ARBs, and NSAIDs raise lithium levels.

Source: Lithium carbonate prescribing information (DailyMed) — Section 7, Drug Interactions

Correct answer: C. Linezolid can cause myelosuppression (anemia, leukopenia, pancytopenia, thrombocytopenia), especially with longer courses. Labeling recommends weekly complete blood counts.

Why the other options are wrong:

• A: Digoxin levels aren't related to linezolid.
• B: INR isn't a linezolid monitoring parameter.
• D: TSH isn't a linezolid monitoring parameter.

Remember: Linezolid: weekly CBC, and watch serotonergic drugs.

Source: Zyvox (linezolid) prescribing information (DailyMed) — Section 5, Myelosuppression

Correct answer: B. ACE inhibitors reduce efferent arteriolar tone and aldosterone, so they can raise serum creatinine and potassium. Labeling warns about hyperkalemia and changes in renal function, which is why both are checked after starting or increasing the dose.

Why the other options are wrong:

• A: Blood counts aren't the main ACE inhibitor safety labs.
• C: Liver enzymes aren't routinely the key labs.
• D: Uric acid and calcium aren't the key labs.

Remember: ACE inhibitor or ARB start: check SCr and K.

Source: Lisinopril tablets prescribing information (DailyMed) — Section 5, Impaired renal function; Hyperkalemia

Correct answer: C. Effective feedback is timely, specific, based on first-hand observation, and focused on behavior that can change. Holding problems until a final evaluation or giving only general praise denies the learner a chance to improve.

Why the other options are wrong:

• A: Late feedback removes the chance to improve during the rotation.
• B: Vague praise doesn't tell the learner what to keep or change.
• D: Comparisons with peers aren't feedback on the learner's behavior.

Remember: Feedback: timely, specific, observed, behavior-focused.

Source: Ende J. Feedback in clinical medical education. JAMA. 1983;250:777-781 — Guidelines for giving feedback

Correct answer: A. Levothyroxine has a long half-life, so steady state takes weeks. Labeling recommends monitoring TSH 6 to 8 weeks after any dose change in adults with primary hypothyroidism.

Why the other options are wrong:

• B: Too early for TSH to reflect the new dose.
• C: Annual checks are for stable patients, not right after a change.
• D: Waiting for symptoms risks months of over- or under-treatment.

Remember: Levothyroxine dose change → TSH in 6-8 weeks.

Source: Levothyroxine sodium tablets prescribing information (DailyMed) — Section 2, Monitoring TSH

Correct answer: A, B, D, E. Amiodarone can cause hypo- or hyperthyroidism, hepatic injury, pulmonary toxicity, and optic neuropathy or corneal deposits. Its labeling describes monitoring for each of these.

Why the other options are wrong:

• C: CK isn't routinely monitored for amiodarone.
• F: Uric acid isn't an amiodarone monitoring parameter.

Remember: Amiodarone: thyroid, liver, lungs, eyes (plus skin, ECG).

Source: Amiodarone hydrochloride tablets prescribing information (DailyMed) — Section 5, Warnings and Precautions

Correct answer: D. The guidelines call for at least 150 to 300 minutes a week of moderate-intensity aerobic activity (or 75 to 150 minutes of vigorous activity), plus muscle-strengthening activity at least 2 days a week.

Why the other options are wrong:

• A: 60 minutes is below the minimum.
• B: The guideline gives a moderate-intensity option and does not require vigorous activity only.
• C: A step count isn't the federal guideline's target.

Remember: Adults: 150+ min moderate or 75+ min vigorous per week, plus strength training 2 days.

Source: Physical Activity Guidelines for Americans, 2nd edition (ODPHP) — Current guidelines for adults

Correct answer: D. Nitrostat labeling directs dissolving 1 tablet under the tongue at the first sign of an attack. If chest pain isn't improved or is worse 5 minutes after the first dose, patients should call emergency services. Another tablet may be taken every 5 minutes, up to 3 in 15 minutes.

Why the other options are wrong:

• A: Swallowed nitroglycerin is largely broken down by first-pass metabolism.
• B: Doses are taken one at a time, 5 minutes apart, not together.
• C: Tablets should stay in the original glass container, tightly capped.

Remember: SL NTG: 1 tablet; call 911 at 5 minutes if not better; max 3 in 15 minutes.

Source: Nitrostat prescribing information (DailyMed) — Section 2; Patient Counseling Information

Correct answer: A. Inhaled corticosteroids can cause oropharyngeal candidiasis. Labeling advises rinsing the mouth with water without swallowing after each dose to reduce this risk.

Why the other options are wrong:

• B: Inhaled corticosteroids are maintenance therapy and don't provide quick relief.
• C: Food has no role in thrush prevention.
• D: A brief breath hold is part of inhaler technique, but it does not prevent thrush.

Remember: Inhaled steroid: rinse and spit.

Source: Flovent HFA (fluticasone propionate) prescribing information (DailyMed) — Section 5, Local effects; Patient Counseling Information

Correct answer: D. St. John's wort induces drug-metabolizing enzymes (including CYP3A4) and can lower levels of many drugs. NCCIH notes it can make birth control pills less effective, leading to breakthrough bleeding and unplanned pregnancy.

Why the other options are wrong:

• A: It lowers, not raises, hormone levels.
• B: The interaction is well documented.
• C: Hypoglycemia is not the concern.

Remember: St. John's wort = inducer: contraceptives, warfarin, cyclosporine, HIV drugs, and more.

Source: NCCIH, St. John's Wort — Safety: drug interactions

Correct answer: A. Epinephrine auto-injector labeling directs injection into the anterolateral aspect of the thigh, through clothing if needed. Patients should not inject into the buttocks, hands, or feet, and should seek emergency care afterward.

Why the other options are wrong:

• B: The thigh is the labeled site.
• C: Injection into the buttock is warned against.
• D: Auto-injectors are not designed for abdominal injection.

Remember: Epinephrine auto-injector: outer thigh, through clothes if needed, then call 911.

Source: EpiPen (epinephrine injection) auto-injector prescribing information (DailyMed) — Section 2, Dosage and Administration