NCLEX Pharmacology Cheat Sheet: 50 Must-Know Drugs Organized by Body System

Cardiovascular Drugs

Cardiovascular medications dominate the NCLEX. Expect questions on blood pressure management, heart failure, anticoagulation, and rhythm control. Focus on when to hold, what to monitor, and critical patient education.

Beta-Blockers (-olol)

• Key drugs: metoprolol, atenolol, propranolol, carvedilol
• Mechanism: Block beta-adrenergic receptors, decreasing heart rate, blood pressure, and cardiac workload.
• NCLEX nursing priority: Check apical pulse for 1 full minute before giving. Hold if HR < 60 bpm or systolic BP < 90 mmHg. Never stop abruptly — taper to avoid rebound hypertension.
• High-alert flag: Can mask hypoglycemia symptoms in diabetic patients.
• Memory trick: "-olol = Oh-so-LOw heart rate."

ACE Inhibitors (-pril)

• Key drugs: lisinopril, enalapril, captopril, ramipril
• Mechanism: Block angiotensin-converting enzyme, decreasing blood pressure by preventing vasoconstriction and aldosterone release.
• NCLEX nursing priority: Monitor potassium (hyperkalemia risk). Teach the patient to report a persistent dry cough (switch to an ARB if intolerable). Contraindicated in pregnancy (Category X).
• Memory trick: "-pril = Pressure Reducing In Lungs."

ARBs (-sartan)

• Key drugs: losartan, valsartan, irbesartan
• Mechanism: Block angiotensin II receptors directly — similar effect to ACE inhibitors but without the dry cough.
• NCLEX nursing priority: Same hyperkalemia monitoring as ACE inhibitors, and the same pregnancy contraindication. Common NCLEX scenario: a patient switched from an ACE inhibitor due to cough — the ARB is the answer.

Calcium Channel Blockers (-dipine)

• Key drugs: amlodipine, nifedipine (vascular); diltiazem, verapamil (cardiac + vascular)
• Mechanism: Block calcium channels, causing vasodilation and reduced cardiac contractility.
• NCLEX nursing priority: Monitor for peripheral edema (especially with dihydropyridines). Avoid grapefruit juice — it increases drug levels. Diltiazem and verapamil also slow heart rate (do not combine with beta-blockers without caution).

Anticoagulants

Heparin (IV/SubQ):

• Monitor: aPTT (activated partial thromboplastin time) — target 1.5–2.5x control
• Antidote: Protamine sulfate
• Never rub the SubQ injection site

Warfarin (Coumadin) — oral:

• Monitor: PT/INR — target INR 2.0–3.0 (2.5–3.5 for mechanical heart valves)
• Antidote: Vitamin K (phytonadione)
• Avoid foods high in vitamin K (consistent intake, not elimination)
• Interacts with MANY drugs — always check

Enoxaparin (Lovenox) — SubQ:

• Low-molecular-weight heparin — does NOT require routine aPTT monitoring
• Inject in the abdomen; do not aspirate or rub

Digoxin (Lanoxin)

• Mechanism: Increases cardiac contractility (positive inotrope) and slows heart rate (negative chronotrope).
• NCLEX nursing priority: Check apical pulse for 1 full minute. Hold if HR < 60 bpm in adults, < 70 in children. Therapeutic range: 0.5–2.0 ng/mL.
• Toxicity signs: Nausea, vomiting, halos around lights, bradycardia. Hypokalemia increases digoxin toxicity risk — always check potassium.
• Memory trick: "Dig the K" — digoxin and potassium are best friends. Low K = dig toxicity.

Statins (-statin)

• Key drugs: atorvastatin, simvastatin, rosuvastatin
• Mechanism: Inhibit HMG-CoA reductase, lowering LDL cholesterol.
• NCLEX nursing priority: Administer at bedtime (peak cholesterol synthesis at night). Monitor liver enzymes. Report unexplained muscle pain immediately (rhabdomyolysis risk).

Respiratory Drugs

Respiratory questions focus on understanding the difference between rescue inhalers and maintenance inhalers, and correct inhaler technique.

Short-Acting Beta-2 Agonists (SABAs)

• Key drug: albuterol (ProAir, Ventolin)
• Mechanism: Relax bronchial smooth muscle for rapid bronchodilation.
• NCLEX nursing priority: This is the RESCUE inhaler. Use BEFORE the corticosteroid inhaler. If using more than 2x/week, asthma is not well-controlled.
• Side effects: Tachycardia, tremors, nervousness.

Inhaled Corticosteroids (ICS)

• Key drugs: fluticasone, budesonide, beclomethasone
• Mechanism: Reduce airway inflammation (maintenance, NOT rescue).
• NCLEX nursing priority: Rinse mouth after each use to prevent oral thrush (candidiasis). Use a spacer with an MDI. Takes days to weeks for full effect — not for acute attacks.

Central Nervous System & Psychiatric Drugs

CNS drugs are tested heavily across multiple NCLEX categories. Pay attention to safety: fall precautions, serotonin syndrome, and neuroleptic malignant syndrome.

Benzodiazepines (-pam, -lam)

• Key drugs: lorazepam (Ativan), diazepam (Valium), midazolam (Versed), alprazolam (Xanax)
• Mechanism: Enhance GABA activity for sedation, anxiolysis, and anticonvulsant effects.
• NCLEX nursing priority: Monitor respiratory status (CNS depression). Implement fall precautions. Do NOT stop abruptly — risk of seizures. Avoid alcohol.
• Antidote: Flumazenil (Romazicon)

SSRIs

• Key drugs: fluoxetine (Prozac), sertraline (Zoloft), escitalopram (Lexapro)
• Mechanism: Block serotonin reuptake, increasing serotonin availability in the brain.
• NCLEX nursing priority: Takes 2–4 weeks for therapeutic effect. Black box warning: increased suicidal ideation in children and adolescents. Watch for serotonin syndrome (hyperthermia, agitation, tremor, clonus) — especially when combined with MAOIs or triptans.

Opioid Analgesics

• Key drugs: morphine, hydromorphone (Dilaudid), fentanyl, oxycodone
• Mechanism: Bind to mu-opioid receptors for pain relief, sedation, and respiratory depression.
• NCLEX nursing priority: Monitor respiratory rate — hold if RR < 12 breaths/min. Assess pain using a validated scale. Anticipate constipation (start a bowel regimen prophylactically).
• Antidote: Naloxone (Narcan) — reverses opioid effects within 2 minutes IV.
• Memory trick: "Nal-OX-one knocks out opioids."

Atypical Antipsychotics (-pine, -done)

• Key drugs: olanzapine, quetiapine, risperidone, aripiprazole
• Mechanism: Block dopamine D2 and serotonin 5-HT2A receptors.
• NCLEX nursing priority: Monitor for metabolic syndrome — weight gain, hyperglycemia, hyperlipidemia. Check fasting glucose and lipids regularly. Watch for extrapyramidal symptoms (EPS) and report signs of neuroleptic malignant syndrome (fever, rigidity, altered mental status).

Antibiotics & Anti-Infectives

Antibiotic questions focus on allergies, proper administration, therapeutic drug monitoring, and patient education about completing the full course.

Penicillins (-cillin)

• Key drugs: amoxicillin, ampicillin, piperacillin
• Mechanism: Inhibit bacterial cell wall synthesis.
• NCLEX nursing priority: Always ask about penicillin allergy FIRST. Cross-sensitivity with cephalosporins exists (5–10%). Watch for anaphylaxis — have epinephrine available. Complete the full course.

Aminoglycosides (-mycin, -micin)

• Key drugs: gentamicin, tobramycin, amikacin
• Mechanism: Inhibit bacterial protein synthesis (bactericidal).
• NCLEX nursing priority: Monitor peak and trough levels. Watch for ototoxicity (tinnitus, hearing loss) and nephrotoxicity (rising creatinine, decreased urine output). Ensure adequate hydration.
• Memory trick: "A Mean Guy damages ears and kidneys" (AminoGlycoside).

Fluoroquinolones (-floxacin)

• Key drugs: ciprofloxacin, levofloxacin, moxifloxacin
• Mechanism: Inhibit DNA gyrase and topoisomerase IV.
• NCLEX nursing priority: Black box warning — tendon rupture and tendinitis. Avoid in children. Take with water on an empty stomach (avoid dairy, antacids, and iron — chelation). Photosensitivity — wear sunscreen.

Vancomycin

• Mechanism: Inhibits cell wall synthesis — reserved for MRSA and C. difficile.
• NCLEX nursing priority: Monitor trough levels (15–20 mcg/mL for serious infections). Infuse slowly over 60+ minutes — rapid infusion causes Red Man Syndrome (flushing, hypotension). Monitor renal function.

Endocrine Drugs

Endocrine pharmacology — especially insulin and newer diabetes drugs — is one of the most heavily tested categories on the NCLEX.

Insulin Types

This is an absolute must-know. The NCLEX loves insulin onset, peak, and duration questions.

• Critical facts: Only regular insulin can be given IV. When mixing NPH with regular, draw up Regular first ("clear before cloudy"). Glargine is NEVER mixed with other insulins.
• Memory trick: "RN" — Regular before NPH.

GLP-1 Receptor Agonists (-glutide)

• Key drugs: semaglutide (Ozempic/Wegovy), liraglutide (Victoza), dulaglutide (Trulicity)
• Mechanism: Mimic incretin hormones — stimulate insulin secretion, suppress glucagon, and slow gastric emptying.
• NCLEX nursing priority: Inject subcutaneously (not IV). Monitor for pancreatitis (severe abdominal pain radiating to the back). Causes nausea and weight loss — counsel patients that this is expected. A newer NCLEX favorite.

SGLT2 Inhibitors (-gliflozin)

• Key drugs: empagliflozin (Jardiance), dapagliflozin (Farxiga), canagliflozin (Invokana)
• Mechanism: Block glucose reabsorption in the kidneys — glucose is excreted in urine.
• NCLEX nursing priority: Monitor for UTIs and genital yeast infections (glycosuria creates a breeding ground). Watch for euglycemic diabetic ketoacidosis — DKA with normal blood glucose. Also indicated for heart failure (expanding use).

Levothyroxine (Synthroid)

• Mechanism: Synthetic T4 — replaces thyroid hormone in hypothyroidism.
• NCLEX nursing priority: Take on an empty stomach, 30–60 minutes before breakfast. Monitor for signs of hyperthyroidism (toxicity): tachycardia, weight loss, tremors, heat intolerance. Interacts with calcium and iron supplements (separate by 4 hours).

Emergency & High-Alert Drugs

These drugs show up in priority-setting and delegation questions. Know them cold.

Epinephrine

• Uses: Anaphylaxis, cardiac arrest, severe asthma.
• NCLEX key facts: First-line for anaphylaxis (IM in the lateral thigh). In cardiac arrest: 1 mg IV/IO every 3–5 minutes. Monitor heart rhythm continuously.

Adenosine

• Use: Supraventricular tachycardia (SVT).
• NCLEX key facts: Causes brief asystole (warn the patient). Push fast with a rapid NS flush. The patient must be on continuous telemetry.

Magnesium Sulfate

• Uses: Pre-eclampsia/eclampsia seizure prophylaxis, torsades de pointes, hypomagnesemia.
• NCLEX nursing priority: Monitor deep tendon reflexes (DTRs) — absent DTRs = toxicity. Monitor respiratory rate (hold if < 12). Monitor urine output (>=30 mL/hr). Antidote: Calcium gluconate.

Potassium Chloride (KCl)

• Use: Hypokalemia replacement.
• NCLEX nursing priority: NEVER give IV push — fatal cardiac arrest risk. Always dilute and infuse slowly (max 10 mEq/hr peripherally). Monitor cardiac rhythm. Check renal function first.

Antidotes Quick Reference

If the NCLEX asks about toxicity, it's usually asking for the antidote. Memorize this table.

5 Pharmacology Study Strategies That Actually Work

1. Study by drug class, not individual drugs. If you know the class, you know 80% of what the NCLEX tests — mechanism, side effects, and nursing priorities carry across the class.
2. Learn the suffix, learn the class. Use a drug suffixes cheat sheet alongside this guide to identify drug classes instantly.
3. Focus on safety first. The NCLEX is a safety exam. For every drug, ask: When do I hold it? What do I monitor? What do I teach the patient?
4. Use spaced repetition. Study 5–10 drugs per day, then review the previous day's drugs before adding new ones. NCLEX RN Mastery's adaptive algorithm does this for you.
5. Connect drugs to patient scenarios. Don't memorize in isolation — picture a real patient taking the drug and think through the nursing process.

Your Next Step

You now have the 50 most-tested drugs organized exactly how the NCLEX presents them. But reading a cheat sheet isn't the same as being tested on it.

Open NCLEX RN Mastery and filter to Pharmacology questions. The adaptive algorithm identifies exactly which drug classes you're weakest in and drills them until you've locked them in. That's how 3.2 million nurses studied — and passed.