A liquid antacid is the fastest way to relieve heartburn, typically easing the burning within minutes by directly neutralizing stomach acid. If you don’t have antacids on hand, a few simple techniques like adjusting your position or chewing gum can also provide noticeable relief in a short window. Here’s what actually works, how quickly each option kicks in, and what to skip.
Liquid Antacids Work Fastest
Over-the-counter antacids (brands like Maalox, Mylanta, or Gaviscon in liquid form) are your quickest option. They neutralize stomach acid on contact, which means relief can start within minutes of swallowing a dose. Liquid formulations work faster than chewable tablets because the liquid spreads across the stomach lining immediately, while tablets need time to dissolve first.
The tradeoff is that antacids don’t last very long. You’ll typically get one to three hours of relief before the burning may return. If you need something that holds up longer, an H2 blocker like famotidine (Pepcid) takes about an hour to kick in but keeps working for four to ten hours. It’s a slower start for a longer payoff.
Proton pump inhibitors (PPIs) like omeprazole are not helpful for a sudden episode. They take one to four days to reach full effect, so they’re designed for ongoing acid problems rather than the flare-up you’re dealing with right now.
Alginate Products Create a Physical Barrier
Some antacid products contain sodium alginate, an ingredient derived from seaweed that does something different from standard acid neutralizers. When it hits stomach acid, it forms a gel-like “raft” that floats on top of your stomach contents. This raft physically blocks acid from splashing up into your esophagus. Carbon dioxide gets trapped inside the gel, keeping it buoyant.
These alginate-based products (Gaviscon Advance is a common one) offer rapid relief like regular antacids but tend to last longer because the raft stays in place even after the neutralizing effect fades. If your heartburn gets worse when you bend over or lie down, this type of product is especially useful since it’s literally sitting on top of the acid.
Baking Soda: A Kitchen Shortcut
If you have no antacids at home, half a teaspoon of baking soda dissolved in a glass of cold water neutralizes acid the same way a commercial antacid does. It works quickly and can tide you over in a pinch.
There are limits, though. Don’t use more than five teaspoons in a day, don’t rely on it for more than two weeks, and don’t take it within one to two hours of other medications (it can interfere with absorption). People with high blood pressure, kidney disease, or heart disease should avoid it entirely because the sodium content can cause water retention. It’s a one-time fix, not a routine solution.
Position Changes That Help Right Now
Gravity is a simple, free tool. If you’re lying flat, sit up or stand. That alone can reduce the amount of acid reaching your esophagus. If the heartburn hit while you were sleeping or you need to stay in bed, roll onto your left side. In that position, your stomach sits below your esophagus, making it harder for acid to travel upward. Research from Amsterdam UMC found that left-side sleeping also allows acid that has already entered the esophagus to drain back into the stomach more quickly.
Elevating the head of your bed by about six inches (using a wedge pillow or blocks under the bedframe) helps for the same reason. Propping yourself up with regular pillows is less effective because it tends to bend you at the waist, which can actually increase abdominal pressure.
Chewing Gum Clears Acid Naturally
This one sounds too simple to work, but chewing sugar-free gum for 20 to 30 minutes after a meal roughly doubles your saliva production. Saliva is mildly alkaline, and the act of swallowing it repeatedly washes acid back down from the esophagus. In one study from the University of Dundee, doubling salivary flow cut the time it took to clear acid from the esophagus from about seven minutes down to just over two minutes. Choose a non-mint flavor, since peppermint can relax the valve between your stomach and esophagus and make things worse.
What to Avoid During a Flare-Up
Reaching for a glass of milk feels instinctive, but it’s complicated. Skim milk may offer brief relief thanks to its protein and calcium content, which can temporarily buffer acid. Whole milk, however, often backfires. Its fat relaxes the muscular valve at the top of your stomach, and it slows stomach emptying, which means a larger volume of food and acid sits around longer with more opportunity to reflux upward. Even the protein in milk has a catch: it triggers a hormone that tightens that valve but also stimulates more acid production, so the net effect is unclear.
Other things to avoid while your symptoms are active: lying down within two to three hours of eating, wearing tight clothing around your waist, and consuming chocolate, alcohol, coffee, or citrus. These all either relax the lower esophageal valve or directly irritate the lining of the esophagus.
Fastest Relief: A Quick Comparison
- Liquid antacid: Minutes to onset, lasts 1 to 3 hours
- Alginate antacid: Minutes to onset, lasts longer than standard antacids
- Baking soda in water: Minutes to onset, short duration
- Chewing gum: 10 to 20 minutes for noticeable improvement
- Sitting upright or left-side positioning: Nearly immediate partial relief
- H2 blocker (famotidine): About 1 hour to onset, lasts 4 to 10 hours
When Heartburn Might Be Something Else
Heartburn and heart attacks can feel surprisingly similar. Typical heartburn is a burning sensation in the chest that shows up after eating, gets worse when you lie down, comes with a sour taste or mild regurgitation, and improves with antacids. A cardiac event is more likely to involve pressure or squeezing in the chest that spreads to your neck, jaw, or arms, along with shortness of breath, cold sweat, lightheadedness, or sudden fatigue.
If you have persistent chest pain and you’re not sure it’s heartburn, call 911. This is especially important if you have risk factors like high blood pressure, diabetes, high cholesterol, or a history of smoking. Even chest pain that goes away on its own can be a warning sign worth following up on.