NCLEX Pharmacology: High-Yield Drug Classes and Suffixes
Nurseclex Editorial Team · Updated · 12 min read · Written around the NCSBN test plan
Short answer
NCLEX pharmacology rewards knowing drug classes rather than individual drugs. Learn the common suffixes, each class's most dangerous adverse effect, the assessment you perform before giving it, and the key reversal agents. Pair this with medication safety principles and you can reason through unfamiliar drugs.
Key takeaways
- Learn drug classes through their suffixes.
- Know each class's most dangerous adverse effect.
- Link each drug to the assessment done before giving it.
- Memorize the key reversal agents.
- Apply the rights of medication administration every time.
Suffixes that unlock drug classes
Suffixes let you identify a drug's class even when you don't recognize its name. That is a major advantage on the exam.
Pair each suffix with one key nursing check. For example, check the heart rate before giving a beta blocker.
Make flashcards that show the suffix, the class, the main risk and the nursing check.
- -olol: beta blockers
- -pril: ACE inhibitors
- -sartan: ARBs
- -statin: HMG-CoA reductase inhibitors
- -prazole: proton pump inhibitors
- -pam/-lam: benzodiazepines
- -mycin/-micin: some antibiotics
Cardiovascular medications
Beta blockers and calcium channel blockers lower heart rate and blood pressure, so check vitals before giving them. ACE inhibitors can cause a cough, angioedema and high potassium.
Digoxin requires an apical pulse check. Toxicity signs include nausea, vomiting and visual changes, and hypokalemia raises the risk.
Diuretics affect potassium. Loop and thiazide diuretics lower it, and potassium-sparing diuretics can raise it.
Anticoagulants
Heparin and warfarin carry bleeding risk. Monitor labs and watch for bleeding.
Teach clients to use a soft toothbrush, report dark stools and, for warfarin, keep vitamin K intake consistent.
Reversal agents: protamine for heparin, vitamin K for warfarin.
Endocrine medications
Insulin requires matching doses to meals and recognizing hypoglycemia.
Levothyroxine is taken on an empty stomach at the same time each day.
Long-term corticosteroids should not be stopped abruptly.
CNS and psychiatric medications
Opioids and benzodiazepines can cause respiratory depression. Naloxone and flumazenil are the respective reversal agents.
Lithium has a narrow therapeutic range, and toxicity risk rises with dehydration.
Antipsychotics can cause movement disorders and, rarely, neuroleptic malignant syndrome.
Anti-infectives
Ask about allergies before any first dose and watch for anaphylaxis.
Aminoglycosides and vancomycin require monitoring of kidney function and drug levels.
Teach clients to finish courses as prescribed.
Medication safety principles
Use two identifiers and the rights of medication administration. Double-check high-alert medications according to policy.
If an assessment finding makes a drug unsafe right now, hold it and notify the provider.
Report medication errors honestly and promptly.
Practice questions
1. Which drug is most likely a beta blocker?
Answer and rationale
Correct: B. The -olol suffix identifies beta blockers.
2. Which antidote should the nurse have available for heparin?
Answer and rationale
Correct: C. Protamine sulfate reverses heparin.
3. A client on furosemide has a potassium of 3.1 mEq/L. What should the nurse do?
Answer and rationale
Correct: B. Loop diuretics lower potassium further. Report the low result before giving the dose.
4. Which statement by a client taking warfarin needs correction?
Answer and rationale
Correct: C. Aspirin increases bleeding risk with warfarin. This statement shows the client needs more teaching.
Frequently asked questions
How much pharmacology is on the NCLEX?
Pharmacological and Parenteral Therapies is one of the larger RN test plan areas. Check the current NCSBN plan for exact weights.
Do I need to memorize every drug?
No. Focus on classes, suffixes, major risks and nursing checks.
What are the most important antidotes?
Naloxone, flumazenil, protamine and vitamin K are high-yield.
How should I study pharmacology?
Use suffix flashcards, practice questions and rationale review every day.
Does Nurseclex offer pharmacology practice?
Yes. See the pharmacology essentials topic and free practice pages.
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Sources
All practice questions are original and are not actual exam items. NCLEX® is a registered trademark of NCSBN, which does not endorse this site.