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Nursing Field Notes / Pharmacology · NCLEX Drug Review Series

NCLEX Drugs 2 💧

Sedative-Hypnotics · Antiplatelets · Anticoagulants · Loop, Thiazide & Potassium-Sparing Diuretics

NG-124 PHARM Series: NCLEX Drug Review 2 of 5 ADHD-friendly visual edition

This set is fluid, blood & clot management in one page. The diuretics are the trickiest — three classes, three different nephron addresses, and two of them pull potassium OUT while one holds it IN. Nail that one distinction and half this page is free points.

📄 Simple Nursing original — opens in Drive →

💤 Z-drugsAmbien & Lunesta — short-term insomnia only, big fall-risk after dosing.
🩸 Platelets vs. clot cascadeAntiplatelets (ASA, Plavix) stop clumping. Anticoagulants (Coumadin, Lovenox, Heparin) stop the clotting cascade.
💧 3 diuretics, 3 addressesLoop & thiazide waste K⁺. K-sparing keeps K⁺ in.
⚖️ Daily weightSame time, scale, clothing — the #1 trend for diuretic effect & fluid status.
🗺️

LINEUP

STEP 1 · WHAT'S IN THIS SET

Robo's 3-part study map for every drug on this page: CLASS → ACTION → WATCH.

🧭 This installment covers 6 classes

💤Sedative-Hypnotics
🩸Antiplatelets
🧂K-Sparing Diuretics
🌊Loop Diuretics
💧Thiazide Diuretics
🧵Anticoagulants
🧠 "Sleep, Stick, Squeeze, Save." Sedatives put you to Sleep · antiplatelets keep cells from Sticking · diuretics Squeeze water out three different ways · anticoagulants Save you from a clot forming in the first place.

🏷️ Brand → Generic — memorize the pairs

ClassBrand Name(s)Generic Name
Sedative-
Hypnotic		AmbienZolpidem Tartrate
LunestaEszopiclone
AntiplateletASA (aspirin)Acetylsalicylic Acid
PlavixClopidogrel
Potassium-
Sparing Diuretic		AldactoneSpironolactone
DyreniumTriamterene
Loop
Diuretic		BumexBumetanide
DemadexTorsemide
LasixFurosemide
Thiazide
Diuretic		DiurilChlorothiazide Sodium
Hydrodiuril, HCTZHydrochlorothiazide
ZaroxolynMetolazone
AnticoagulantCoumadinWarfarin
LovenoxEnoxaparin
—Heparin Sodium (from beef/pork)
🧠 Diuretic name clues: Loop diuretic brand names sound sharp/fast (Lasix, Bumex, Demadex) — they act fast & hard. Thiazides often end differently and are gentler, everyday BP drugs.
⚙️

ACTION

STEP 2 · CLASS → MECHANISM → TRAP

One card per class — including the nephron map that finally makes the three diuretic classes make sense.

💤 Sedative-Hypnotics Ambien · Lunesta

Mechanism: "Z-drugs" that act on GABA receptors to promote sleep onset — chemically different from benzodiazepines but produce a similar calming effect.

⭐ Key nursing point: for short-term insomnia management; give only when the patient can commit to a full night (about 7–8 hours) of sleep. Raise the side rails and instruct the patient to call for help before getting up — significant fall risk.

💊 Dose given at bedtime safe sleep window ~7–8h if woken early 🚨 fall / confusion risk zone
🚨 NCLEX trap: Being woken early after a dose can cause grogginess, confusion, or unsafe ambulation — treat it like a fall-risk medication, not a harmless sleep aid.

🩸 Antiplatelets Aspirin (ASA) · Plavix

Mechanism: interferes with the first step of the clotting process — platelet aggregation (platelets clumping together at an injury site).

⭐ Key nursing point: monitor for bruising/bleeding, hold per provider order before surgery, and use with caution alongside other bleeding-risk drugs (anticoagulants, NSAIDs).

Step 1: platelets clump ✖ blocked by ASA / Plavix Step 2: clotting cascade → fibrin mesh ✖ blocked by Coumadin / Lovenox / Heparin
🚨 NCLEX trap: Pepto-Bismol contains aspirin (a salicylate) — easy to overlook as an OTC "hidden" source of aspirin in a patient with a true aspirin allergy or one already on antiplatelet/anticoagulant therapy.

💧 Diuretics — one nephron, three addresses Loop · Thiazide · K-Sparing

Glomerulus proximal tubule descending loop ASCENDING LOOP OF HENLE 🌊 LOOP diuretics act here block Na⁺/Cl⁻/K⁺/H₂O reabsorption — most potent DISTAL TUBULE 💧 THIAZIDE diuretics act here ↑ excretion of Na⁺/Cl⁻/K⁺/H₂O COLLECTING DUCT 🧂 K-SPARING diuretics act here block aldosterone → Na⁺/Cl⁻/H₂O OUT, K⁺ stays IN
🧠 "Loop = biggest leak, Thiazide = medium leak, K-Sparing = patches the K⁺ hole." All three push sodium and water out — only the K-sparing class protects potassium while doing it.

🌊 Loop Diuretics Bumex · Demadex · Lasix

Mechanism: inhibit reabsorption of Na⁺, Cl⁻, K⁺ & H₂O in the loop of Henle (also acts in the proximal & distal tubules) — the most potent diuretic class.

⭐ Key nursing point: monitor for hypokalemia, daily weight, I&O, and BP; ototoxicity risk with rapid IV administration or with other ototoxic drugs (e.g., aminoglycosides).

🚨 NCLEX trap: Hypokalemia from a loop diuretic can trigger digoxin toxicity in a patient also on digoxin — always correlate the K⁺ level with digoxin symptoms.

💧 Thiazide Diuretics Diuril · HCTZ · Zaroxolyn

Mechanism: ↑ excretion of Na⁺, Cl⁻, K⁺ & H₂O in the distal tubule and ascending loop of Henle — gentler than loop diuretics, commonly first-line for hypertension.

⭐ Key nursing point: also causes hypokalemia — monitor potassium; can raise blood glucose and uric acid (caution in diabetes/gout).

🚨 NCLEX trap: Metolazone (Zaroxolyn) still works even with reduced kidney function and is often paired with a loop diuretic for a synergistic effect in resistant fluid overload.

🧂 Potassium-Sparing Diuretics Aldactone · Dyrenium

Mechanism: block aldosterone at receptor sites in the distal tubule — excrete Na⁺, Cl⁻ & H₂O, but not K⁺.

⭐ Key nursing point: monitor for hyperkalemia (the opposite risk from loop/thiazide) — teach patients to avoid potassium supplements and salt substitutes (often KCl-based) unless directed.

🚨 NCLEX trap: Spironolactone can cause gynecomastia and menstrual irregularities from its anti-androgen activity — a teaching point students often forget belongs to this drug.

🧵 Anticoagulants Coumadin · Lovenox · Heparin

Mechanism: interferes with the blood clotting process (the cascade that forms fibrin) — used to prevent thrombus and embolus formation, not to break up an existing clot.

⭐ Key nursing point: heparin sodium is derived from beef or pork sources — assess for animal-product allergies before administration. Monitor aPTT for IV heparin and INR for warfarin; enoxaparin (Lovenox), a low-molecular-weight heparin, is given subcutaneously and generally does not require routine coagulation monitoring.

🚨 NCLEX trap: Antidotes differ — protamine sulfate reverses heparin, vitamin K reverses warfarin. Do not expel the air bubble from a prefilled Lovenox syringe before a subQ injection.
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TEACH

STEP 3 · SAFETY & PATIENT TEACHING

Where each electrolyte lands, plus the bedside teaching that keeps these six classes from blurring together.

🧪 Potassium risk by diuretic class — low ↔ high scale

Normal serum K⁺ (standard adult reference range): 3.5–5.0 mEq/L

LOW · hypokalemia NORMAL 3.5–5.0 mEq/L HIGH · hyperkalemia Loop & Thiazide K-Sparing

Bottom line: any patient on a loop or thiazide diuretic needs potassium monitoring for a LOW level; any patient on a potassium-sparing diuretic (or one combined with an ACE inhibitor/ARB) needs monitoring for a HIGH level.

⚖️ Diuretic teaching essentials

  • 🕗 Take in the morning to avoid nighttime urination/sleep disruption
  • ⚖️ Daily weight — same time, scale, clothing; report a gain of about 2–3 lb in a day or 5 lb in a week
  • 🩹 Rise slowly — orthostatic hypotension risk
  • 🍌 Loop/thiazide: eat potassium-rich foods unless told otherwise; K-sparing: avoid extra potassium/salt substitutes

🩸 Bleeding-precaution teaching

  • 🪥 Soft-bristle toothbrush, electric razor
  • 🆘 Report unusual bruising, black/tarry stools, pink-tinged urine, prolonged bleeding
  • 💊 Avoid NSAIDs/extra aspirin unless approved
  • 🥬 Warfarin: keep vitamin K intake (leafy greens) consistent, not eliminated — big swings change the INR
🧠 "Consistent, not zero." The #1 warfarin-diet myth is avoiding greens entirely — the real rule is a steady amount week to week.

📊 Antiplatelet vs. Anticoagulant — don't mix them up

Antiplatelet (ASA, Plavix)Anticoagulant (Coumadin, Lovenox, Heparin)
Blocks platelet aggregation — step 1 of clottingBlocks the clotting cascade — later steps forming fibrin
Typical use: prevent arterial clots (MI, stroke)Typical use: prevent venous clots (DVT/PE), AFib stroke prevention
No specific reversal agent routinely usedReversal: protamine (heparin), vitamin K (warfarin)
⚡

QUICK RECALL

SAY IT OUT LOUD
💤 Z-drugsShort-term only · fall risk after dosing
🩸 AntiplateletBlocks platelet aggregation (step 1)
💧 Loop & thiazideWaste K⁺ — watch for hypokalemia
🧂 K-sparingHolds K⁺ in — watch for hyperkalemia
🎯 Cover & check — 4 rapid-fire questions
Q1: Which diuretic class is the most potent and acts at the loop of Henle?
Loop diuretics (Bumex, Demadex, Lasix) — inhibit Na⁺/Cl⁻/K⁺/H₂O reabsorption in the loop of Henle.
Q2: Which diuretic class is the exception — it does NOT cause potassium loss?
Potassium-sparing diuretics (Aldactone/spironolactone, Dyrenium/triamterene) — they block aldosterone and spare K⁺, risking hyperkalemia instead.
Q3: What OTC product contains hidden aspirin?
Pepto-Bismol — it contains a salicylate (aspirin-related compound).
Q4: What is the antidote for heparin, and for warfarin?
Protamine sulfate reverses heparin; vitamin K reverses warfarin.