Nursing Field Notes / GI · Pharmacology Course · Acid-Reducer Family 3 of 4 — THE CHEAT SHEET

Acid Prevention 🧴

Antacids · H2 Blockers · PPIs — the master comparison page

NG-233 GI · Pharmacology ADHD-friendly visual edition

This page is the tie-breaker for the whole acid family: three drug classes, three speeds, three strengths. Deep-dive the individual classes on PPIs (NG-140), H2 Antagonists (NG-119), and Mucosal Protectant (NG-254) — come back here whenever they blur together.

📄 Simple Nursing original — opens in Drive →

🧴 Antacid = fastest, shortestNeutralizes acid immediately but wears off quickly.

🚫 H2 blocker = middle groundReversible receptor block, moderate strength & speed.

⛽ PPI = strongest, slowestIrreversible pump block — best for healing, not instant relief.

🕐 Space it all 1–2 hrAntacids block absorption of other oral drugs — always separate.

🧴

THE FAMILY

STEP 1 · MEET EVERY PLAYER

Four ways to fight acid — neutralize it, block its release two different ways, or coat the wound so it can't reach it.

🫙 Four strategies, one stomach

🧠 “Neutralize, Block-A, Block-B, Coat.” Antacid neutralizes acid already made · H2 blocker & PPI both reduce production (different mechanisms) · mucosal protectant coats the ulcer and never touches acid levels at all.

🧂 Antacids — immediate, temporary

Sodium bicarbonate (Alka-Seltzer)
Calcium carbonate (Tums, Rolaids)
Aluminum hydroxide
Magnesium hydroxide (Milk of Magnesia)

Immediately neutralizes acid — but ONLY temporary, not long-lasting.

💩 Antacid cation memory trick

🪨Aluminumconstipation

🦴Calciumconstipation

💧Magnesiumdiarrhea

🎈Sodiumfluid retention — avoid in HF

🧠 “Al & Ca CLOG, Mg goes.” Aluminum and Calcium clog you up (constipation) — Magnesium is mellow and moves things along (diarrhea). Sodium swells — never for a heart-failure patient.

💊 H2 Blockers & PPIs — the two "reduce production" classes, side by side

	H2 Blockers	PPIs
Suffix	-tidine — ranitidine, famotidine	-prazole — omeprazole, esomeprazole, pantoprazole
MOA	Reversibly blocks H2 receptors on the stomach's parietal cells	Inhibits the proton pump in the parietal cells
Indications	GERD & ulcer (duodenal/gastric) prevention	Stress-ulcer prevention, GERD, heartburn

🧠 Full drug-by-drug breakdown, dosing, and adverse effects for each class live on their own pages — NG-119 and NG-140.

📊

COMPARE

STEP 2 · THE MASTER TABLE

When two of these blur together on an exam, this is the table that untangles them.

📋 Master comparison — all four classes

	Antacid	H2 Blocker	PPI	Mucosal Protectant
Example	Calcium carbonate	Famotidine	Omeprazole	Sucralfate
Mechanism	Neutralizes existing acid	Reversibly blocks histamine at H2 receptor	Irreversibly blocks the proton pump	Coats the ulcer — does NOT neutralize acid
Onset	Minutes — fastest	~30–60 min	Slower — days for full effect	Needs an acidic environment to activate
Duration	Shortest — wears off fast	Moderate	Longest — 24+ hr per dose	Local, until next dose
Relative potency	Lowest	Middle	Highest	N/A — different job entirely
Key teaching	Space 1–2 hr from other oral meds	Space 1–2 hr from antacids	Give 30–60 min before meals	Give on empty stomach, separate from antacids/PPIs

🧠 “Fast fades, slow stays.” The faster a class works, the sooner it wears off. Antacid = fast in, fast out. PPI = slow to ramp up, but it lasts the longest and suppresses the most acid.

📈 Potency & onset at a glance

🧠 The two bars are mirror images: the class with the shortest onset has the lowest potency, and the class that takes longest to kick in gives the strongest suppression.

🗣️

TEACH

STEP 3 · HESI-STYLE TRAPS

Every acid drug shares the same spacing rule — the traps are in the details that are different.

🚨 HESI-style trap: sodium bicarbonate + heart failure

NOT for heart failure patients — sodium bicarbonate antacid adds a sodium load that promotes fluid retention. Sodium = swells.

🕐 Universal spacing rule

Antacids can interfere with the absorption of other oral drugs. Separate any other medication by 1 hour before or after an antacid — this rule repeats across every acid-drug page in this family.

🧠 “Anti-Acid = Anti-Mixing.” The whole point of the name doubles as the safety rule: don't mix it with other meds too closely in time.

🎓 One card per class — PPI teaching highlights

⏱️30 min before mealstiming

🍽️No overeatingprevents reflux

🦴Porous bonesget bone density tests

🦠C. diff riskpossible GI infection

🚭No stress / smokingworsens acid

💊No NSAIDs + ASA= GI bleed risk

PPIs are also used for stress-ulcer prophylaxis in hospitalized/surgical patients — one of the most common inpatient reasons you'll see one ordered.

🔗 Go deeper — one page per class

⚡

QUICK RECALL

SAY IT OUT LOUD

🧴 AntacidFastest onset, lowest potency, wears off fast

🚫 H2 blockerMiddle ground — reversible, moderate

⛽ PPISlowest onset, highest potency, lasts longest

🕐 1–2 hr ruleAlways space acid drugs from other oral meds

🎯 Cover & check — 4 rapid-fire questions

Q1: Rank the three acid-suppressing classes from fastest onset to slowest.

Antacid (minutes) → H2 blocker (~30–60 min) → PPI (slowest, days for full effect).

Q2: Rank them from lowest potency to highest.

Antacid (lowest) → H2 blocker (moderate) → PPI (highest).

Q3: Which antacid ingredient is contraindicated in heart failure, and why?

Sodium bicarbonate — the sodium load promotes fluid retention.

Q4: What's the one rule that applies to every drug in this family?

Space it 1–2 hours apart from other oral medications, especially antacids, which can interfere with absorption.