For occasional indigestion, an antacid containing calcium carbonate or magnesium hydroxide is the fastest option, typically relieving symptoms within minutes. If your indigestion keeps coming back or antacids aren’t cutting it, stronger over-the-counter options like acid-reducing tablets can help. The right choice depends on how often you get symptoms and how quickly you need relief.
Antacids: Fastest Relief
Antacids work by neutralizing stomach acid that’s already been produced. They don’t stop your stomach from making more acid, but they knock down what’s there right now. That’s why they’re best for occasional, predictable flare-ups rather than chronic problems.
Calcium carbonate is the most potent antacid ingredient available over the counter. It can completely neutralize stomach acid and starts working within minutes. You’ll find it in products like Tums and Rolaids. Most other antacids combine aluminum hydroxide and magnesium hydroxide, which work a bit more slowly but are still effective. Aluminum hydroxide also deactivates pepsin, a digestive enzyme that can irritate your stomach lining and esophagus.
The tradeoff with antacids is that their relief is short-lived, usually a few hours at most. If you find yourself reaching for them multiple times a day, that’s a sign you may need something stronger.
H2 Blockers: Longer-Lasting Protection
H2 blockers take a different approach. Instead of neutralizing acid after it’s made, they reduce how much acid your stomach produces in the first place. Famotidine (sold as Pepcid) is the most common one available without a prescription. It starts working in about an hour and lasts around 12 hours, a significant upgrade over antacids.
For occasional indigestion, the typical over-the-counter dose is 10 to 20 mg, taken once or twice a day as needed. One useful trick: taking it 15 to 60 minutes before a meal you know will trigger symptoms can prevent indigestion from starting. If you’re heading to a spicy dinner or a late-night meal, this preemptive approach works well.
Proton Pump Inhibitors: For Persistent Symptoms
Proton pump inhibitors (PPIs) like omeprazole (Prilosec) are the strongest acid reducers you can buy over the counter. They shut down acid production more completely than H2 blockers and keep working for about 24 hours once they kick in. The catch is they take a few days to reach full effect, so they’re not helpful for a sudden bout of indigestion you want to fix right now.
Over-the-counter PPIs are designed for a 14-day course of treatment and can be used up to three times per year. They’re meant for people who get heartburn or indigestion two or more days a week, not for occasional use. The FDA recommends following the label closely and not exceeding the directed duration.
Bismuth Subsalicylate for Nausea and Upset Stomach
If your indigestion comes with nausea or a general queasy feeling rather than pure heartburn, bismuth subsalicylate (the active ingredient in Pepto-Bismol) targets those symptoms specifically. It helps with heartburn, indigestion, and nausea in adults and teenagers.
One thing that catches people off guard: it can temporarily turn your tongue dark and make your stools grayish black. This is harmless and goes away once you stop taking it, but it’s worth knowing so you don’t panic.
The Baking Soda Option
Baking soda (sodium bicarbonate) is a legitimate antacid, though it’s weaker and shorter-acting than calcium carbonate. The standard ratio is half a level teaspoon dissolved in half a glass of water (about 4 ounces), taken every two hours as needed. Make sure it’s fully dissolved before drinking. Because it’s high in sodium, it’s not a good choice if you’re on a sodium-restricted diet.
What About Ginger and Peppermint?
Peppermint is often recommended for indigestion, but the evidence is more nuanced than you’d expect. Products combining peppermint oil with caraway oil have shown some benefit for relieving indigestion in studies. Peppermint oil taken on its own, however, may actually worsen indigestion in some people. If you want to try a peppermint-based remedy, look for a combination product rather than straight peppermint oil.
Foods and Habits That Make It Worse
What you avoid can matter as much as what you take. The most common indigestion triggers share a few biological mechanisms. Fatty foods relax the muscular valve between your esophagus and stomach, letting acid creep upward. Spicy foods contain capsaicin, which slows digestion and lets food sit in your stomach longer while also irritating the esophagus. Alcohol relaxes that same valve, giving acid a free path. Multiple servings of caffeine throughout the day can also trigger symptoms, though a single morning cup of coffee is usually fine for most people.
Timing matters too. Eating within two hours of lying down is a classic trigger. Indigestion that wakes you from sleep is often linked to a late meal. Eating smaller portions and staying upright for a couple of hours after eating are two of the simplest changes you can make.
Choosing the Right Option
The best choice depends on your pattern:
- Indigestion happening right now: An antacid with calcium carbonate gives the fastest relief, within minutes.
- A meal you know will cause trouble: An H2 blocker like famotidine taken 15 to 60 minutes beforehand can prevent symptoms for up to 12 hours.
- Indigestion most days of the week: A 14-day course of an over-the-counter PPI like omeprazole is designed for this, though it takes a few days to start working.
- Nausea with your indigestion: Bismuth subsalicylate targets the queasiness that antacids won’t touch.
When Indigestion Isn’t Just Indigestion
Most indigestion is uncomfortable but harmless. Typical symptoms include a burning sensation in your chest or upper abdomen after eating, a sour taste in your mouth, or a small amount of stomach contents rising into your throat. These usually respond to antacids.
Heart attacks can mimic indigestion. The key differences: cardiac chest pain tends to feel like pressure, tightness, or squeezing rather than burning, and it may spread to your neck, jaw, or arms. Shortness of breath, cold sweats, lightheadedness, or sudden fatigue alongside chest discomfort are warning signs that something more serious is happening. Gallbladder problems can also masquerade as indigestion, typically showing up as an intense, steady ache in the upper abdomen after fatty meals that may radiate to the shoulders or neck. Persistent chest pain that you can’t confidently attribute to indigestion warrants a call to emergency services.