Preparing for the NAPLEX or FPGEE means mastering not just pharmacology in theory, but also the drugs you’ll encounter most often in practice. Year after year, the same medications dominate prescriptions across the U.S. — and these are the very names that appear again and again in exam questions, clinical case scenarios, and patient-counseling sections.
This guide covers the Top 20 Most-Prescribed Drugs that every candidate must know — their classes, key uses, adverse effects, and counseling points.
1. Lisinopril (Prinivil, Zestril)
Class: ACE inhibitor
Use: Hypertension, heart failure, post-MI
Key point: Can cause cough, hyperkalemia, angioedema — avoid in pregnancy.
2. Levothyroxine (Synthroid, Levoxyl)
Class: Thyroid hormone replacement
Use: Hypothyroidism
Key point: Take on an empty stomach, 30–60 min before breakfast; avoid calcium/iron near dosing.
3. Atorvastatin (Lipitor)
Class: HMG-CoA reductase inhibitor
Use: Dyslipidemia, ASCVD prevention
Key point: Monitor LFTs and muscle pain; take any time of day.
4. Metformin (Glucophage)
Class: Biguanide
Use: Type 2 diabetes mellitus
Key point: First-line agent; GI upset common; contraindicated in severe renal impairment (eGFR < 30).
5. Amlodipine (Norvasc)
Class: Calcium channel blocker (dihydropyridine)
Use: Hypertension, angina
Key point: May cause ankle edema, flushing, headache.
6. Metoprolol (Lopressor, Toprol XL)
Class: Beta-1 blocker
Use: Hypertension, angina, heart failure, post-MI
Key point: Don’t stop abruptly; watch for bradycardia and fatigue.
7. Albuterol (Ventolin HFA, ProAir HFA)
Class: Short-acting β₂-agonist
Use: Acute asthma/COPD relief
Key point: Inhale 1–2 puffs PRN; tremor and tachycardia possible.
8. Omeprazole (Prilosec)
Class: Proton-pump inhibitor
Use: GERD, peptic ulcer
Key point: Take before meals; long-term use → low Mg²⁺, fractures, C. difficile risk.
9. Losartan (Cozaar)
Class: ARB
Use: Hypertension, diabetic nephropathy
Key point: Hyperkalemia risk; avoid in pregnancy; alternative if ACE-induced cough.
10. Simvastatin (Zocor)
Class: Statin
Use: Hyperlipidemia
Key point: Take at bedtime; avoid strong CYP3A4 inhibitors (clarithromycin, azoles, grapefruit).
11. Hydrocodone/Acetaminophen (Norco, Vicodin)
Class: Opioid analgesic combination
Use: Moderate–severe pain
Key point: Risk of dependence, sedation; avoid other acetaminophen-containing products.
12. Hydrochlorothiazide (HCTZ, Microzide)
Class: Thiazide diuretic
Use: Hypertension, edema
Key point: Causes hypokalemia, photosensitivity; monitor electrolytes.
13. Sertraline (Zoloft)
Class: SSRI antidepressant
Use: Depression, anxiety, OCD
Key point: May cause insomnia, sexual dysfunction; taper slowly to avoid withdrawal.
14. Gabapentin (Neurontin)
Class: Anticonvulsant/neuropathic pain agent
Use: Seizures, neuropathic pain
Key point: Causes dizziness and sedation; adjust dose in renal impairment.
15. Furosemide (Lasix)
Class: Loop diuretic
Use: Edema, heart failure
Key point: Potent diuresis; monitor potassium, volume status, ototoxicity.
16. Amoxicillin (Amoxil)
Class: Penicillin antibiotic
Use: ENT, respiratory, urinary infections
Key point: Complete full course; may cause diarrhea or rash.
17. Prednisone
Class: Corticosteroid
Use: Inflammatory and autoimmune disorders
Key point: Take with food; taper after long-term use; can raise glucose and BP.
18. Montelukast (Singulair)
Class: Leukotriene receptor antagonist
Use: Asthma maintenance, allergic rhinitis
Key point: Take once daily in evening; monitor for mood changes.
19. Clopidogrel (Plavix)
Class: Antiplatelet (P2Y12 inhibitor)
Use: Post-MI, stroke prevention, stent therapy
Key point: Avoid PPIs like omeprazole; watch for bleeding/bruising.
20. Insulin Glargine (Lantus, Basaglar)
Class: Long-acting insulin
Use: Type 1 & 2 diabetes
Key point: Inject once daily same time; monitor for hypoglycemia and injection-site reactions.
How to Study These Drugs Effectively
- Learn mechanisms and monitoring together – Know what to watch for (labs, vitals) and why.
- Master patient counseling – Exam cases often test whether you can translate pharmacology into plain advice.
- Create class-based flashcards – E.g., “ACE inhibitors – suffix -pril – cough, hyperkalemia, pregnancy X.”
- Revise brand-generic pairs daily – You’ll see both formats on test day.
- Use active recall – Quiz yourself on indications, contraindications, black-box warnings.