The fastest way to get rid of heartburn is with an effervescent antacid containing sodium bicarbonate, which can start neutralizing stomach acid in as little as 6 seconds. Chewable calcium-magnesium carbonate tablets work nearly as fast, raising stomach pH within about 6 minutes. While you reach for a remedy, a few simple body adjustments can also reduce the burn right away.
Antacids: The Fastest Option
Antacids work by directly neutralizing the acid already in your stomach, which is why they’re the quickest over-the-counter choice. Not all forms work at the same speed, though. Effervescent powders (the kind you dissolve in water) are the fastest, beginning to change stomach acidity within seconds. Chewable tablets containing calcium carbonate or a calcium-magnesium blend typically start working within 6 to 30 minutes and keep working for about 60 minutes in the esophagus and up to 3 hours in the stomach. Swallowable tablets, by contrast, have surprisingly little effect and are worth skipping if speed matters to you.
If you take an antacid on an empty stomach, expect relief to last roughly 20 to 60 minutes. Taking one about an hour after eating extends that window to around 2 hours, because food slows stomach emptying and keeps the antacid in contact with acid longer. Combination antacids that include aluminum hydroxide and magnesium hydroxide tend to last a bit longer in the esophagus (about 80 minutes) compared to straight calcium carbonate (about 60 minutes).
Baking Soda in a Pinch
If you don’t have antacids on hand, plain baking soda (sodium bicarbonate) is essentially the same active ingredient found in the fastest effervescent products. Mix half a teaspoon into a full glass of cold water and drink it. You can repeat this every two hours if needed, but don’t exceed 5 teaspoons in a single day, and don’t use it as a regular remedy for more than two weeks. At high doses or with prolonged use, sodium bicarbonate can shift your blood chemistry in ways that stress your kidneys.
Alginate Products Form a Physical Barrier
Some heartburn products contain sodium alginate, a seaweed-derived ingredient that works differently from standard antacids. When alginate hits stomach acid, it forms a gel-like “raft” that floats on top of your stomach contents. In lab conditions, this raft begins forming in under 30 seconds. It acts as a physical cap, preventing acid from splashing up into your esophagus. Products combining alginate with an antacid give you both the chemical neutralization and the physical barrier, which can be especially helpful if your heartburn comes with regurgitation.
H2 Blockers Work, but Not Instantly
Medications like famotidine reduce acid production rather than neutralizing existing acid. That difference matters when you’re looking for speed. H2 blockers take roughly an hour to start working, but their effects last much longer: famotidine provides about 9 hours of reduced acid output compared to roughly 1 hour from a calcium carbonate antacid. If your heartburn tends to return after antacids wear off, taking an H2 blocker alongside the antacid gives you both fast and sustained relief.
Proton pump inhibitors (the strongest acid-reducing medications) are even slower. They can take several days to reach full effect because they work by gradually shutting down acid-producing pumps in the stomach lining. They’re designed for ongoing management, not the fast fix you’re looking for right now.
Body Position Changes That Help Immediately
If heartburn hits while you’re lying down, roll onto your left side. This isn’t folk wisdom. When you lie on your left, your esophagus sits above the level of your stomach, so gravity works in your favor and acid is less likely to flow upward. Lying on your right side does the opposite, positioning your esophagus below the stomach junction and making reflux worse. A systematic review of the research confirmed that left-side sleeping consistently reduces both acid exposure and symptoms.
Staying upright is even better than lying on your left side. If you’ve been lying down, sit up or stand. If you’ve been bending over (gardening, cleaning under furniture), straighten up. Gravity is a simple, immediate tool for keeping acid where it belongs.
Loosen What You’re Wearing
Tight waistbands are a surprisingly potent heartburn trigger. Research using pressure monitors found that a snug belt increases pressure inside the stomach by about 7 to 9 mmHg, which doesn’t sound dramatic until you see the effect: acid reflux events increased roughly 8-fold with the belt on. Even more striking, the time it took the esophagus to clear acid after a reflux episode jumped from 23 seconds without a belt to 81 seconds with one. If you’re wearing tight jeans, a cinched belt, shapewear, or a fitted waistband, loosening or removing that pressure can provide noticeable relief within minutes.
Chew a Piece of Gum
Chewing gum stimulates saliva production, and saliva is mildly alkaline. In one study, chewing gum roughly doubled saliva flow and cut the time needed to clear acid from the esophagus by about two-thirds (from nearly 7 minutes down to about 2.3 minutes). Sugar-free gum works fine. This won’t eliminate a severe episode on its own, but it’s a useful add-on when you’re away from home or waiting for an antacid to kick in. Avoid peppermint-flavored gum, though, since peppermint can relax the valve between your esophagus and stomach and make things worse.
Avoid What Makes It Worse Right Now
While you’re dealing with an active episode, a few things will reliably prolong or intensify the burn:
- Lying down or bending over lets acid travel more easily into the esophagus
- Eating more food increases stomach volume and acid production
- Drinking alcohol, coffee, or carbonated beverages can relax the lower esophageal valve or increase stomach pressure
- Smoking reduces the pressure of the esophageal valve and slows saliva production
If your last meal was large, resist the urge to lie down for at least two to three hours. Walking gently can help your stomach empty faster than sitting still.
When It Might Not Be Heartburn
Heartburn and heart attacks can feel remarkably similar. Even experienced physicians sometimes can’t distinguish them without testing. Heartburn typically presents as a burning sensation after eating that responds to antacids, often with a sour taste or mild regurgitation. A heart attack is more likely to feel like pressure, tightness, or squeezing in the chest that may radiate to the neck, jaw, or arms. It often comes with shortness of breath, cold sweats, sudden dizziness, or unusual fatigue. Both conditions can produce symptoms that come and go, so intermittent pain doesn’t rule out something serious. If your chest discomfort is new, severe, or accompanied by any of those additional symptoms, treat it as a cardiac emergency.