The fastest way to relieve GERD is to take a liquid antacid containing aluminum and magnesium hydroxide, which starts neutralizing stomach acid within seconds and lasts about 80 minutes in the esophagus. But if you don’t have antacids on hand, even a full glass of water can raise your stomach pH above 4 within 90 seconds. Below are all your options ranked roughly by speed, plus the positional and behavioral tricks that make any of them work better.
Antacids: The Fastest Over-the-Counter Option
Liquid antacids that combine aluminum hydroxide and magnesium hydroxide (the formulation in products like Maalox) work faster and last longer than calcium carbonate tablets like Tums. In a head-to-head comparison, the aluminum/magnesium formula beat calcium carbonate for speed of onset in 41 out of 83 subjects, and its esophageal relief lasted about 82 minutes compared to 60 minutes for calcium carbonate. If you’re choosing between a bottle and a chewable tablet, the liquid wins on speed.
The trade-off is that stomach-level relief from any antacid is surprisingly short, roughly 26 minutes. That means antacids are best for knocking down an active flare, not for preventing one that’s hours away. Take them after meals or at the moment symptoms start, not preemptively.
A Glass of Water Works in a Pinch
If you have nothing else available, drinking a full glass of water (about 200 ml, or 7 ounces) raises stomach pH above 4 within about a minute and a half. The catch: the effect only lasts two to four minutes, compared to roughly 12 minutes for antacids. Smaller volumes of water, like a few sips, don’t move the pH needle at all. So if you’re using water as a stopgap, drink a full glass quickly rather than sipping throughout your episode. It buys you a brief window of relief, and it’s often enough to break the cycle if you also adjust your position.
Alginate-Based Products Create a Physical Barrier
Alginate formulations (sold under brand names like Gaviscon Advance) take a different approach. Instead of just neutralizing acid, they form a gel-like “raft” that floats on top of your stomach contents and physically blocks acid from splashing up into the esophagus. The raft forms within seconds of swallowing.
This mechanical barrier is especially useful after meals, when a pocket of highly acidic fluid tends to sit right at the junction of the stomach and esophagus. In imaging studies, alginate products reduced the number of acid reflux episodes from about 15 to roughly 3.5 during the post-meal period, and pushed the time before the first reflux event from 14 minutes to over an hour. If your GERD is worst after eating, an alginate product taken right after a meal is one of the most effective immediate interventions.
Baking Soda: Effective but Use Sparingly
Sodium bicarbonate (plain baking soda) is a potent acid neutralizer you probably already have in your kitchen. The standard dose is half a teaspoon dissolved in a full glass of cold water. You can repeat this every two hours if needed, but don’t exceed five teaspoons in a single day. It works fast, often within minutes, because it reacts directly with hydrochloric acid in the stomach.
The downsides are real, though. Baking soda is extremely high in sodium, so it’s a poor choice if you have high blood pressure or are on a sodium-restricted diet. It can also cause gas and bloating as the chemical reaction produces carbon dioxide. Think of it as an emergency option rather than a daily habit.
Chewing Gum After Meals
Chewing sugar-free gum for 30 minutes after eating reduces the percentage of time your esophagus stays acidic. In one study from King’s College London, the time spent with esophageal pH below 4 dropped from 5.7% to 3.6% during the post-meal window. The mechanism is simple: chewing stimulates saliva production, and each swallow of saliva pushes acid back down out of the esophagus and buffers what remains. This won’t rescue you from a severe flare, but it’s a surprisingly effective add-on when combined with other strategies.
Change Your Position Immediately
Gravity is your most underrated tool. If you’re lying down when symptoms hit, sit upright or stand. If you need to stay in bed, two adjustments make a measurable difference.
First, elevate the head of your bed 6 to 8 inches. This means raising the frame or using a wedge pillow, not just stacking regular pillows (which tends to bend you at the waist and can actually increase abdominal pressure). Second, lie on your left side. When you’re on your left, the esophagus and the muscular valve at its base sit higher than the stomach, which lets acid drain away from the esophagus more quickly. Right-side sleeping does the opposite, positioning that valve below the level of stomach acid and making reflux worse.
These two changes, left side plus elevation, work together. Many people find they can cut nighttime symptoms dramatically without adding any medication at all.
Ginger for Sluggish Digestion
If your GERD is partly driven by slow stomach emptying (you feel uncomfortably full long after meals, or food seems to “sit” in your stomach), ginger may help. Research in healthy volunteers shows that ginger accelerates gastric emptying and stimulates contractions in the lower stomach, which moves food along faster and reduces the window for reflux. Ginger tea, ginger chews, or capsules containing around 1,200 mg are common forms. This isn’t a rescue remedy for acute burning the way an antacid is, but it can shorten the post-meal danger zone when your GERD tends to spike.
Why PPIs Won’t Help Right Now
Proton pump inhibitors like omeprazole are the strongest acid-suppressing medications available over the counter, but they’re not designed for fast relief. You’ll notice some improvement within two to three days, and full acid suppression builds over one to two weeks of daily use. If you’re in the middle of an active episode, a PPI taken at that moment won’t do anything meaningful. Use an antacid or alginate for the immediate flare, and consider starting a PPI if your symptoms are recurring multiple times a week.
H2 Blockers: The Middle Ground
H2 blockers like famotidine (Pepcid) fall between antacids and PPIs in both speed and duration. They typically begin reducing acid production within 30 to 60 minutes and last several hours. Famotidine has a roughly 30% longer duration of action than older H2 blockers. These are a good option when you want something that kicks in reasonably fast and carries you through the night, but they still aren’t as immediate as a liquid antacid for an active flare. Some people keep both on hand: an antacid for the first few minutes and an H2 blocker for the hours that follow.
When Chest Pain Needs Urgent Attention
GERD and heart problems can produce nearly identical chest sensations. Even experienced physicians sometimes can’t tell them apart from symptoms alone. Typical heartburn burns in the chest after eating, gets worse when lying down or bending over, responds to antacids, and may come with a sour taste or mild regurgitation. Heart-related chest pain doesn’t follow those patterns reliably, but many heart attacks present without the dramatic crushing pain people expect. If your chest pain is new, unusually severe, accompanied by shortness of breath, radiates to your arm or jaw, or doesn’t respond at all to antacids, treat it as a cardiac event until proven otherwise.