Skip to main content

H2 Blocker vs. Antacid vs. PPI

There are various treatment options for acid reflux and heartburn. The three main categories of products include histamine-2 blockers (H2 blockers), antacids, and proton pump inhibitors (PPIs). Learn more about each of them and remember to speak with your healthcare provider about which treatment option might be right for you.

Pepcid logo versus PPI or antacid heartburn relief medication

H2 Blockers

H2 blockers are intended to treat unexpected heartburn and lower the amount of acid your stomach produces by blocking the histamine receptors in your stomach that are responsible for triggering acid production. H2 blockers (like PEPCID®) start relieving heartburn symptoms in just 15-30 minutes and control acid for up to 12 hours.

Antacids

Antacids, like Tums®, are intended to treat unexpected heartburn and neutralize the acid in your stomach, but they don’t block production of more acid. Antacids work quickly, but effects may last up to 2 hours per dose.

Proton Pump Inhibitors (PPIs)

PPIs, like Nexium® and Prilosec®, work by shutting down pumps that release acid into your stomach. PPIs require a 14-day regimen, are intended to treat frequent heartburn, and are not intended for immediate relief. In fact, PPIs may take 1-4 days to fully work*. For consistent heartburn relief you’ll need to keep an even more consistent dosing schedule.

*Some consumers will experience complete relief in 24 hours.

Third party trademarks used herein are trademarks of their respective owners.

Compare H2 Blocker (PEPCID®) vs. Antacid vs. PPI

PEPCID® is an FDA approved, safe and effective remedy to relieve symptoms of occasional heartburn when used as directed.

H2 Blocker
& Antacid

H2 Blocker

Antacid

Proton Pump
Inhibitor (PPI)

Product

PEPCID COMPLETE®

Original & Maximum
Strength PEPCID AC®

TUMS®

NEXIUM® 24HR /
PRILOSEC OTC®

Active Ingredient

Famotidine
(Acid Reducer)

Calcium Carbonate
(Antacid)

Magnesium Hydroxide
(Antacid)

Famotidine
(Acid Reducer)

Calcium Carbonate
(Antacid)

Esomeprazole / Omeprazole
(Acid Reducer)

Intended Use

Treats unexpected heartburn

Treats and prevents unexpected heartburn

Treats unexpected heartburn

Treats frequent heartburn

Adult Dosing

1 tablet

1 tablet

2-4 tablets

1 pill every day for 14 days

Onset of Heatburn Relief

Starts to work in seconds2

Starts to work in minutes1

Starts to work in seconds2

Not intended for immediate relief. Can take up to 1-4 days for full effect

Duration of Acid Control

Up to 12 hours4

Up to 12 hours4

Up to 2 hours

Up to 24 hours (when taken once daily for 14 days)

One Dose Provides Acid Control Through the Night4

Prevents Heartburn Before It Happens3

Drug Interactions (Per Label)

Ask your doctor or pharmacist before use if you are currently taking a prescription drug. Antacids may interact with certain prescription drugs.

Ask your doctor or pharmacist before use if you are currently taking a prescription drug. Antacids may interact with certain prescription drugs.

Ask your doctor or pharmacist before use if you are currently taking a prescription drug. Antacids may interact with certain prescription drugs.

Ask you doctor or pharmacist before use if you are taking: Warfarin, clopidogrel, or cilostazol (blood-thinning medicines); Prescription anti-fungal or anti-yeast medicines; Diogoxin (heart medicine); Diazepam (anxiety medicine); Tacrolimus or mycophenolate mofetil (immune system medicine); Prescription antiretrovirals (medicines for HIV infection); Methotrexate (arthritis medicine)

1. Starts to relieve heartburn in 15-30 minutes
2. Starts to neutralize acid on contact
3. Prevents heartburn if taken 15-60 minutes before a meal
4. Based on 9 hour acid control studies during the day and 12 hour acid control studies at night. Acid control does not imply symptom relief.

© McNeil Consumer Pharmaceuticals 2021
Third party trademarks used herein are trademarks of their respective owners.

See Why PEPCID® Could Work for You

Pepcid logo versus other over-the-counter heartburn relief medication

Compare PEPCID® to Other OTC Heartburn Medications

Find the best over the counter heartburn medicine which may help relieve your symptoms.

Pepcid AC Maximum Strength, Pepcid Complete, Pepcid Complete Travel, and Pepcid AC Original Strength

What Is PEPCID®?

PEPCID® is the original brand with the active ingredient famotidine which is a histamine-2 blocker (H2 blocker) that provides relief for occasional heartburn.