NCLEX Pharmacology Cheat Sheet: The Drug Classes That Show Up Most (2026)

Pharmacology is the topic students dread most and the one the NCLEX tests hardest. The good news: you do not have to memorize 400 individual drugs. You have to know the classes, and one key nursing action for each. Here is the high-yield cheat sheet.

The trick with pharm is simple: learn the class, learn the suffix, learn the one thing that will hurt the patient. Do that and you can answer questions about drugs you have never seen.

Cardiovascular

• Beta blockers (-olol): hold for low heart rate or low blood pressure. Watch for masked hypoglycemia in diabetics.
• ACE inhibitors (-pril): watch for dry cough and high potassium. Angioedema is the emergency.
• Calcium channel blockers (-dipine): watch blood pressure; constipation is common.
• Digoxin: hold for a heart rate under 60, know the toxicity signs, and know the normal level.
• Anticoagulants (warfarin, heparin): know the antidotes (vitamin K, protamine) and the labs (INR, aPTT).

Endocrine

• Insulin: know onset and peak, because peak is when hypoglycemia hits. Regular insulin is the only IV one.
• Levothyroxine: take on an empty stomach, in the morning, for life.
• Corticosteroids (-sone): never stop abruptly, watch glucose and infection risk.

Infection

• Aminoglycosides (gentamicin, tobramycin): watch kidneys and hearing, monitor peak and trough.
• Vancomycin: monitor trough, infuse slowly to avoid red man syndrome.

Pain and psych

• Opioids: watch respiratory rate; naloxone is the antidote.
• SSRIs: take weeks to work, watch for serotonin syndrome.
• Benzodiazepines: watch sedation; flumazenil is the antidote.
• Lithium: narrow therapeutic range, watch sodium and hydration.

How to study pharm without losing your mind

Group by class. Learn the suffix. For each class, memorize one nursing action and one thing that signals danger. Then do practice questions until the pattern is automatic. Memorizing drug lists is how you burn out. Learning classes is how you pass.

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Frequently asked questions

How do I study pharmacology for the NCLEX?
Learn by drug class and suffix, not by individual drug. For each class, know one key nursing action and the sign of danger, then drill practice questions.

What pharmacology is most tested on the NCLEX?
Cardiac drugs, insulin, anticoagulants, antibiotics like aminoglycosides and vancomycin, opioids, and psych drugs like SSRIs and lithium are all high-yield.

Do I need to memorize exact drug doses?
Rarely. The NCLEX focuses on nursing actions, monitoring, and safety, not memorizing every dose.

You've got this. Learn the class, spot the danger, and pharm becomes points.

Nurse June, BSN, RN
Founder, Your Nursing Space