Three types of over-the-counter medications treat acid reflux, and each works differently: antacids for fast relief, H2 blockers for moderate-duration control, and proton pump inhibitors (PPIs) for the strongest, longest-lasting acid suppression. Which one you should reach for depends on how often your symptoms hit and how severe they are.
Antacids: Fastest Relief, Shortest Duration
Antacids (Tums, Rolaids, Maalox) are the simplest option. They work within minutes by directly neutralizing the acid already in your stomach. That makes them ideal for occasional heartburn after a heavy meal or a glass of wine. The trade-off is that relief fades relatively quickly, often within an hour or two, because they don’t stop your stomach from producing more acid. If you find yourself chewing antacids several times a day, you likely need something stronger.
Alginate Products: A Physical Barrier
Gaviscon works differently from standard antacids, though you’ll find it in the same aisle. It contains an alginate compound that reacts with stomach acid to form a foam-like “raft” that floats on top of your stomach contents. This raft acts as a physical barrier, preventing acid from splashing up into your esophagus. The raft forms within seconds of swallowing and can stay intact in the stomach for several hours, giving longer relief than a traditional antacid. It’s a particularly good option for reflux that flares after eating, since that’s when stomach contents are most likely to push upward.
H2 Blockers: Moderate, Longer-Lasting Control
H2 blockers (famotidine, sold as Pepcid) reduce acid production by blocking one of the chemical signals that tells your stomach to make acid. They take 30 to 90 minutes to kick in, so they’re not the best choice when you need relief right now. But once they start working, the effect lasts 4 to 10 hours.
That timing makes H2 blockers useful in two ways. You can take one before a meal you know will trigger symptoms, or you can take one at bedtime to reduce the nighttime acid that causes morning throat irritation. They’re a solid middle ground if antacids aren’t cutting it but your symptoms aren’t an everyday problem.
PPIs: The Strongest Option
Proton pump inhibitors (omeprazole, lansoprazole, esomeprazole) are the most powerful acid-suppressing medications available without a prescription. They shut down the acid-producing pumps in your stomach lining by permanently disabling them. Your body has to make new pumps to resume normal acid production, which is why the effect lasts so long.
PPIs take several days to reach full effectiveness, so don’t expect instant results. They’re designed for a 14-day course, taken once daily before your first meal. If you bought them without a prescription and your symptoms haven’t improved after two weeks, that’s a sign to see a doctor rather than continue on your own. The FDA recommends limiting OTC PPI use to a 14-day course no more than three times per year.
PPIs are the right choice when you’re dealing with frequent heartburn (two or more days a week) that hasn’t responded to antacids or H2 blockers. They’re not meant for the occasional post-pizza burn.
How They Compare at a Glance
- Antacids: Start working in minutes. Relief lasts 1 to 2 hours. Best for occasional, mild symptoms.
- Alginate products (Gaviscon): Start working in seconds. Relief lasts several hours. Best for post-meal reflux.
- H2 blockers (famotidine): Start working in 30 to 90 minutes. Relief lasts 4 to 10 hours. Best for predictable triggers or nighttime symptoms.
- PPIs (omeprazole, etc.): Take days to reach full effect. Provide all-day acid suppression. Best for frequent, persistent reflux.
Drug Interactions Worth Knowing
Most people take these medications without problems, but PPIs in particular can interfere with other drugs. Omeprazole and esomeprazole affect a liver enzyme involved in processing several common medications. The FDA issued a specific warning against combining them with clopidogrel (Plavix), a blood-thinning drug, because the PPI can reduce clopidogrel’s effectiveness. If you take clopidogrel, pantoprazole is a safer PPI alternative because it has a weaker effect on that enzyme.
PPIs can also raise blood levels of warfarin, certain anti-seizure medications, and digoxin (a heart medication), potentially increasing side effects. Antacids cause a different kind of interaction: they can reduce the absorption of medications taken at the same time simply by changing your stomach’s pH. If you take other daily medications, spacing them at least two hours apart from an antacid helps avoid this.
Choosing the Right One for Your Situation
If heartburn hits you once or twice a month after specific triggers, antacids or an alginate product will handle it. If you get symptoms a few times a week, especially at night, an H2 blocker gives more reliable coverage. If you’re dealing with daily reflux that’s been going on for weeks, a 14-day PPI course is the appropriate step before involving a doctor.
You can also layer these strategically. Since PPIs take days to build up, some people use antacids for immediate relief during the first few days of a PPI course. H2 blockers and PPIs target acid production through different mechanisms, so adding a bedtime H2 blocker during a PPI course is sometimes done for stubborn nighttime symptoms, though this works better as a short-term strategy.
Signs That OTC Treatment Isn’t Enough
Certain symptoms signal that something more serious may be going on and self-treating with OTC medications isn’t appropriate. The American Gastroenterological Association flags these as alarm symptoms: chest pain during physical activity, unintentional weight loss, difficulty swallowing or choking on food, vomiting blood or material that looks like coffee grounds, and red or black stools. Any of these alongside reflux symptoms warrants prompt medical evaluation.