Several types of medicine treat acid reflux, and the best choice depends on how often you get symptoms and how severe they are. For occasional heartburn after a big meal, an over-the-counter antacid works within minutes. For symptoms that keep coming back multiple times a week, a stronger acid-reducing medication taken daily will give you more consistent relief.
Antacids: Fastest Relief for Occasional Symptoms
Antacids are the simplest option. Products containing calcium carbonate, magnesium hydroxide, or sodium bicarbonate are all bases that neutralize stomach acid on contact. They start working within minutes, which makes them ideal when heartburn hits unexpectedly. The downside is that their effect is short-lived, typically wearing off in one to three hours. If you’re reaching for antacids more than twice a week, a longer-acting option is worth considering.
Alginates: A Physical Barrier Against Reflux
Alginates take a different approach. Instead of neutralizing acid, they mix with it to form a gel-like raft that floats on top of your stomach contents. This lightweight but sturdy layer physically blocks acid from splashing up into your esophagus. One study found alginates more effective than traditional antacids for treating reflux. You’ll often find them combined with antacids in the same product, giving you both a chemical and physical line of defense.
H2 Blockers: Medium-Strength, Hours of Relief
H2 blockers reduce the amount of acid your stomach produces in the first place. Your stomach cells have receptors that, when activated, trigger acid secretion. H2 blockers occupy those receptors so the signal never gets through. The result is less acid for about four to ten hours per dose.
Famotidine is the most widely available H2 blocker over the counter, sold in 10 mg and 20 mg tablets. The typical dose is 10 to 20 mg up to twice daily, with a maximum of 40 mg per day. H2 blockers work well for people who get predictable symptoms, like nighttime heartburn, because you can take one before bed and stay comfortable through the night. They kick in within about 30 to 60 minutes.
Proton Pump Inhibitors: Strongest Acid Suppression
Proton pump inhibitors, commonly called PPIs, are the most powerful acid-reducing medicines available. They permanently shut down the tiny pumps on your stomach cells that produce acid. Your body makes new pumps over time, which is why you need to take a PPI daily for it to work properly. It takes about three days of consistent use to reach steady-state acid suppression, and up to four days before you feel the full effect. Once they’re working, PPIs reduce stomach acid for 15 to 21 hours a day, compared to roughly eight hours for H2 blockers.
Over-the-counter PPIs include omeprazole and lansoprazole. They’re designed for 14-day courses and are best suited for frequent reflux rather than the occasional episode. If you need something fast, a PPI alone won’t help on the spot. Pairing it with an antacid for immediate relief while the PPI builds up in your system is a common strategy.
How to Choose Between Them
The practical difference comes down to speed versus staying power. Antacids act in minutes but fade fast. H2 blockers take longer to start but cover you for most of a day. PPIs take days to reach full strength but deliver the deepest, longest acid suppression available.
- Heartburn once or twice a week: antacids or alginates as needed
- Heartburn several times a week: a daily H2 blocker, with antacids for breakthrough episodes
- Frequent or severe symptoms: a 14-day PPI course, reassessing afterward
Most doctors recommend starting with lifestyle changes and milder over-the-counter options first. If you don’t get relief within a few weeks, prescription-strength versions and additional testing are the next step.
Prescription-Strength Options
When over-the-counter medicines aren’t enough, prescription versions of the same drug classes are available at higher doses. Prescription PPIs include esomeprazole, lansoprazole, omeprazole, pantoprazole, rabeprazole, and dexlansoprazole. Prescription H2 blockers include higher-dose famotidine and nizatidine.
A newer class called potassium-competitive acid blockers (P-CABs) may be recommended for severe reflux that hasn’t responded to other treatments. These work on the same stomach pumps as PPIs but through a different mechanism, and they don’t require the same multi-day buildup period.
Long-Term Use and Safety
Antacids and alginates are generally safe for occasional use without much concern. H2 blockers are also well tolerated for longer stretches. PPIs are where the safety conversation gets more nuanced.
Taking PPIs for months or years has been associated with reduced absorption of certain vitamins and minerals, lower bone density, and a higher risk of a specific type of gut infection caused by the bacterium C. difficile. These risks don’t mean PPIs are dangerous for everyone who takes them, but they do highlight the importance of using the lowest effective dose and periodically reassessing whether you still need them. Many people stay on PPIs longer than necessary simply because no one revisits the prescription.
Acid Reflux Medicine During Pregnancy
Reflux is extremely common during pregnancy, and the recommended approach follows a step-up pattern. Calcium-containing antacids are the preferred first choice because they also provide calcium and may help reduce the risk of pregnancy-related high blood pressure. Antacids with aluminum and magnesium are also considered safe at normal doses. Avoid bicarbonate-based antacids, which can cause fluid overload, and avoid high doses of magnesium trisilicate.
If antacids aren’t enough, H2 blockers like famotidine are the next step. Studies have found no significant increase in the risk of miscarriage, preterm delivery, or babies being born small for their gestational age. PPIs like lansoprazole and esomeprazole are options if H2 blockers still aren’t controlling symptoms, with research showing no significant increase in major birth defects. Omeprazole carries a slightly lower safety rating during pregnancy and is typically not the first PPI chosen.