The heartburn aisle can be confusing: chewable tablets, liquids, “acid reducers,” “acid controllers.” They mostly fall into three groups that work in very different ways. Picking the right one saves you from both under- and over-treating.
1. Antacids: Fast Relief, Short Lasting
Examples: calcium carbonate (Tums), magnesium and aluminum hydroxide liquids, sodium bicarbonate.
How they work: they neutralize acid that is already in your stomach.
- Speed: minutes.
- Duration: short, often under an hour on an empty stomach, a bit longer after a meal.
- Best for: occasional, predictable heartburn, like after a big dinner.
- Watch out for: constipation (calcium, aluminum), diarrhea (magnesium), too much sodium (baking soda), and too much calcium with heavy use. They can also interfere with absorption of some medications, so space them apart.
Alginates (like Gaviscon) are a useful cousin. They form a gel “raft” that sits on top of stomach contents and physically blocks reflux. They work well after meals and at bedtime.
2. H2 Blockers: Medium Speed, Medium Strength
Examples: famotidine (Pepcid). Some older ones like ranitidine were pulled from the market.
How they work: they block one of the signals (histamine) that tells your stomach to make acid.
- Speed: about 30 to 60 minutes.
- Duration: up to about 12 hours.
- Best for: taking before a meal you know will cause trouble, nighttime symptoms, or mild frequent heartburn.
- Watch out for: they can lose some effect with daily use over weeks. Generally well tolerated.
3. PPIs: Strongest, but Slow to Start
Examples: omeprazole (Prilosec, Losec), esomeprazole (Nexium), lansoprazole, pantoprazole.
How they work: they shut down the “proton pumps” in the stomach lining that actually secrete acid.
- Speed: slow. It can take 1 to 4 days to reach full effect. They are not for instant relief.
- Duration: about 24 hours of acid control once they are working.
- How to take them: 30 to 60 minutes before breakfast. Taking them at the wrong time is a common reason they seem not to work.
- Best for: frequent heartburn (2 or more days a week), GERD, ulcers, and healing an inflamed esophagus.
- Watch out for: over-the-counter PPIs are meant for 14-day courses. Long-term use has been linked to lower B12, magnesium and iron absorption, gut infections and bone concerns. For many people the benefits still outweigh the risks, but it should be a deliberate choice reviewed with a doctor.
The “Rebound” Problem
Stopping a PPI suddenly after weeks or months can cause rebound acid: a temporary spike in acid that makes it feel like you still need the drug. Tapering the dose, or bridging with an H2 blocker or antacids for a couple of weeks, usually gets you through it.
Quick Decision Guide
- Once in a while, after a trigger meal: antacid or alginate.
- Predictable trouble (a late dinner, a night out): an H2 blocker taken beforehand.
- Two or more days a week: a 14-day PPI course, plus habit changes. If it comes back quickly, see a doctor.
- Warning signs (trouble swallowing, vomiting blood, black stools, weight loss): skip self-treatment and get checked.
Medication works best together with the basics: smaller meals, finishing eating 3 hours before bed, raising the head of the bed, and avoiding your personal trigger foods.
The Bottom Line
Antacids are fast and short-lived, H2 blockers are in the middle, and PPIs are strongest but slow and meant to be taken before breakfast. Match the medicine to how often you get symptoms, and do not let a PPI turn into an indefinite habit without a doctor’s review.