Pharmacology Nursing Cheat Sheet — Drug Classes

Pharmacology Nursing Cheat Sheet — Drug Classes Every Student Must Know

Pharmacology is the subject that breaks the most nursing students — not because they aren't smart, but because there are over 20,000 medications and no one tells you where to start. This cheat sheet gives you the framework that makes everything else click.

Learn the drug class system and you'll never have to memorize blindly again.

The Secret: Learn Suffixes, Not Drug Names

Every drug name ending tells you what class it belongs to. Learn 20 suffixes and you can identify hundreds of drugs you've never seen before.

Suffix Drug Class Examples
-olol Beta Blocker Metoprolol, Atenolol, Propranolol
-pril ACE Inhibitor Lisinopril, Enalapril, Captopril
-sartan ARB Losartan, Valsartan, Irbesartan
-statin Cholesterol (HMG-CoA Reductase Inhibitor) Atorvastatin, Rosuvastatin, Simvastatin
-pam / -lam Benzodiazepine Diazepam, Lorazepam, Alprazolam
-mycin / -micin Antibiotic (Macrolide/Aminoglycoside) Azithromycin, Gentamicin, Clarithromycin
-cillin Penicillin Antibiotic Amoxicillin, Ampicillin, Nafcillin
-zole Antifungal / PPI Fluconazole, Omeprazole, Pantoprazole
-dipine Calcium Channel Blocker Amlodipine, Nifedipine, Felodipine
-tidine H2 Blocker Famotidine, Ranitidine, Cimetidine

High-Priority Drug Classes for Nursing

1. Beta Blockers (-olol)

Use Side Effects Nursing Considerations
Hypertension, heart failure, angina, dysrhythmias Bradycardia, hypotension, fatigue, bronchospasm Check HR before giving — hold if HR <60. Never stop abruptly. Caution in asthma/COPD.

2. ACE Inhibitors (-pril)

Use Side Effects Nursing Considerations
Hypertension, heart failure, diabetic nephropathy Dry cough, hyperkalemia, angioedema, hypotension Monitor K+ levels. First dose hypotension — give at bedtime. Contraindicated in pregnancy.

3. Diuretics

Type Example Key Side Effect Remember
Loop Furosemide (Lasix) Hypokalemia Loses K+ — monitor levels, give K+ supplement
Thiazide Hydrochlorothiazide Hypokalemia, hyperglycemia Caution in diabetics
K+ Sparing Spironolactone Hyperkalemia Saves K+ — avoid K+ supplements

NCLEX tip: Furosemide (Lasix) — "Lasix Loses potassium." Spironolactone "Spares potassium." Opposites on the same exam question every time.

4. Anticoagulants

Drug Monitors Antidote Key Point
Heparin aPTT (60–100 sec therapeutic) Protamine sulfate Never give IM — IV or SubQ only
Warfarin PT/INR (2–3 therapeutic) Vitamin K Many food and drug interactions — consistent Vitamin K intake
Enoxaparin No routine monitoring Protamine sulfate (partial) SubQ only, rotate sites, don't rub after

5. Opioids

Examples Side Effects Antidote Nursing Priority
Morphine, Oxycodone, Hydromorphone, Fentanyl Respiratory depression, constipation, sedation, hypotension Naloxone (Narcan) Assess respiratory rate before every dose — hold if RR <12. Keep Narcan at bedside.

High-Alert Medications — Know These Cold

These drugs cause the most serious patient harm when given incorrectly. NCLEX loves them.

Drug Why High Alert Key Nursing Action
Insulin Wrong dose = hypoglycemia or DKA Always check blood glucose before giving. Two-nurse verification for IV insulin.
IV Potassium Cardiac arrest if given too fast Never give IV push. Max rate 10–20 mEq/hr. Always diluted.
Heparin Bleeding risk, dosing errors common Double-check dose. Monitor aPTT. Watch for bleeding.
Digoxin Narrow therapeutic range (0.5–2.0) Check apical pulse 1 full minute before giving. Hold if HR <60. Monitor K+ — hypokalemia increases toxicity.
Warfarin Multiple interactions, bleeding risk Check INR before giving. Consistent Vitamin K diet. Teach patient to avoid NSAIDs.

The 10 Rights of Medication Administration

  1. Right Patient — 2 identifiers
  2. Right Drug
  3. Right Dose
  4. Right Route
  5. Right Time
  6. Right Documentation
  7. Right Reason
  8. Right Response
  9. Right Education
  10. Right Refusal

Top 5 NCLEX Pharmacology Tips

  1. Learn suffixes first — identify the class before worrying about individual drugs.
  2. Know the antidotes cold — Narcan for opioids, Vitamin K for warfarin, Protamine for heparin, Flumazenil for benzos.
  3. High-alert meds always need a second check — insulin, heparin, IV potassium.
  4. Check HR before beta blockers and digoxin — hold if below 60.
  5. ACE inhibitors cause a dry cough — if it bothers the patient, switch to an ARB (-sartan).

Want This as a PDF?

Our Pharmacology Study Guide covers all major drug classes, suffix system, high-alert medications, antidotes, and 10 NCLEX practice questions with full rationales — beautifully color-coded and organized for fast studying.

Get the Pharmacology Guide →

Written by Nora — NurseLegacy Study Guides

Back to blog