Pharmacology questions make up 12–18% of the NCLEX. They are among the most high-yield and most feared section. Here's how to master them systematically.
How to Approach NCLEX Pharmacology
NCLEX pharm questions rarely ask "what is the mechanism of this drug?" Instead, they ask what you would assess before giving the drug, what side effect to monitor for, what patient teaching is needed, and what adverse reaction requires immediate action. Your pharmacology knowledge must be clinically applied, not just factual.
The 10 Most Tested Drug Classes
1. Anticoagulants
Heparin, warfarin, and direct oral anticoagulants (DOACs) appear on almost every NCLEX. Know: warfarin is reversed with vitamin K, heparin with protamine sulfate. Therapeutic INR for most conditions is 2.0–3.0. Monitor PTT for heparin, PT/INR for warfarin. DOACs require no routine monitoring.
2. Insulin
Know all insulin types and their peak action times. Rapid-acting (lispro, aspart) peaks in 1–2 hours. Regular peaks in 2–4 hours. NPH peaks in 4–12 hours. Glargine has no peak. "Cloudy before clear" for mixing insulins — NPH before regular. Signs of hypoglycemia before hyperglycemia on the NCLEX.
3. Digoxin
Therapeutic range: 0.5–2.0 ng/mL. Toxicity signs: nausea, vomiting, visual disturbances (yellow-green halos), bradycardia, dysrhythmias. Always check apical pulse for 1 full minute before administration. Hold if pulse below 60. Hypokalemia potentiates toxicity — monitor potassium.
4. Lithium
Therapeutic range: 0.6–1.2 mEq/L. Toxicity is a medical emergency. Early toxicity: tremor, nausea, polyuria. Moderate: confusion, coarse tremor, hyperreflexia. Severe: seizures, coma, cardiac dysrhythmias. Sodium depletion raises lithium levels — ensure adequate sodium and fluid intake.
5. ACE Inhibitors
Ends in "-pril." Classic side effects: dry cough (most common), angioedema (most dangerous — stop immediately), hyperkalemia. Contraindicated in pregnancy. Monitor creatinine and potassium. Teach patients to avoid NSAIDs and potassium supplements.
| Drug Class | Monitor | Hold/Notify if |
|---|---|---|
| Beta-blockers | BP, HR, blood glucose | HR <60, SBP <90 |
| Calcium channel blockers | BP, HR, peripheral edema | HR <60, SBP <90 |
| Loop diuretics | Potassium, BUN, urine output | K+ <3.5, oliguria |
| Aminoglycosides | BUN, creatinine, hearing | Rising creatinine, tinnitus |
| Phenytoin | Drug level, CBC | Level >20 mcg/mL |
Antidotes You Must Know Cold
- Heparin → protamine sulfate
- Warfarin → vitamin K (phytonadione)
- Opioids → naloxone (Narcan)
- Benzodiazepines → flumazenil
- Acetaminophen overdose → N-acetylcysteine (Mucomyst)
- Digoxin toxicity → digoxin immune Fab (Digibind)
- Beta-blocker overdose → glucagon
- Magnesium toxicity → calcium gluconate
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