Proton pump inhibitors, commonly called PPIs, are the most effective prescription medications for acid reflux. They heal damaged esophageal tissue in 80 to 90 percent of patients and provide stronger acid suppression than any other traditional option. A newer class of drug called PCABs works even faster and may be a better fit for some people, but PPIs remain the standard first-line prescription for most cases of gastroesophageal reflux disease (GERD).
There’s no single “best” medication for everyone. The right choice depends on how severe your symptoms are, whether you have esophageal damage, and how your body responds to treatment. Here’s what the evidence says about each option.
PPIs: The Standard First-Line Treatment
PPIs work by permanently shutting down the acid-producing pumps in your stomach lining. Because they disable the pump itself rather than just reducing a chemical signal, they suppress acid more powerfully than older medications. The catch is that they’re prodrugs, meaning they need to be activated by stomach acid before they start working. That’s why you take them 30 to 60 minutes before a meal on an empty stomach. Eating triggers acid production, which activates the drug right when it’s needed.
Six PPIs are available by prescription in the United States: omeprazole (Prilosec), esomeprazole (Nexium), lansoprazole (Prevacid), rabeprazole (Aciphex), pantoprazole (Protonix), and dexlansoprazole (Dexilant). For standard GERD, a typical prescription is 20 mg of omeprazole once daily before a meal, with other PPIs dosed similarly. All of them are effective, but they aren’t identical.
In head-to-head trials, esomeprazole 40 mg healed erosive esophagitis in 93.7% of patients at eight weeks, compared to 84.2% for omeprazole 20 mg. At the four-week mark, the gap was even wider: 81.7% versus 68.7%. Esomeprazole also keeps stomach acid suppressed for a greater portion of the day. A comparative review from Oregon Health and Science University found eight-week healing rates of roughly 79% for omeprazole, 79% for lansoprazole, 71% for pantoprazole, and 86% for rabeprazole, though confidence intervals overlapped for most of them.
The practical takeaway: all PPIs work well. Esomeprazole at prescription strength has the strongest evidence for faster, more complete healing. But if one PPI doesn’t fully control your symptoms, switching to a different one often helps, since people metabolize these drugs at different rates.
PCABs: A Newer, Faster-Acting Option
Vonoprazan (Voquezna) is the first potassium-competitive acid blocker, or PCAB, approved in the U.S. It targets the same acid pump as PPIs but works through a completely different mechanism. Instead of needing stomach acid to activate it, vonoprazan starts suppressing acid directly after absorption. It also blocks acid pumps whether they’re active or resting, which PPIs cannot do.
The speed difference is dramatic. In a crossover study, vonoprazan kept stomach pH above 4 (the threshold where acid stops causing damage) for 71.4% of the first 24 hours after a single dose. Esomeprazole managed just 23.9% on day one. By day seven, vonoprazan held pH above 4 for 85.8% of the day compared to 61.2% for esomeprazole.
Nighttime acid control is where vonoprazan really pulls ahead. On the first night, it maintained a safe pH level for 67.9% of the overnight period. Esomeprazole managed only 12.9%. This matters because nighttime acid exposure is a major driver of esophageal damage and sleep disruption in people with GERD.
For healing erosive esophagitis, vonoprazan 20 mg and lansoprazole 30 mg reached similar rates at eight weeks (92.4% vs. 91.3%), but vonoprazan got there faster, with 75% healed at just two weeks compared to 67.8% for lansoprazole. Another PCAB called tegoprazan showed a statistically significant advantage over lansoprazole at four weeks in clinical trials.
One major convenience factor: PCABs don’t need to be taken before meals. Because they don’t require acid activation, the timing of your dose relative to food doesn’t matter.
H2 Blockers: For Milder Symptoms
H2 blockers reduce acid by blocking histamine receptors in the stomach, which are one of several signals that trigger acid production. They’re weaker than PPIs and PCABs because they only block one pathway rather than the pump itself. Famotidine (Pepcid) is the most commonly prescribed H2 blocker still on the market.
These medications work well for occasional heartburn and mild reflux symptoms. They’re not appropriate for treating complications like esophagitis, esophageal narrowing from chronic inflammation, or Barrett’s esophagus. If you have visible damage to your esophagus on an endoscopy, your doctor will typically move you to a PPI or PCAB instead.
H2 blockers do have one niche advantage: they can be added at bedtime alongside a morning PPI for people with persistent nighttime symptoms that a PPI alone doesn’t control.
How Long You’ll Take Them
A standard course of prescription PPI therapy runs up to eight weeks. For many people, that’s enough time to heal esophageal damage and get symptoms under control. Long-term daily use is generally not recommended, particularly for older adults, unless you have a condition that specifically requires it (like Barrett’s esophagus or severe erosive disease that relapses).
Stopping a PPI abruptly after more than four weeks of daily use can trigger rebound acid hypersecretion, where your stomach temporarily produces more acid than it did before you started the medication. This typically shows up within two to eight weeks of stopping and causes heartburn, regurgitation, or indigestion that can last days to weeks. It’s uncomfortable but usually mild, and it doesn’t mean your reflux is back for good.
To minimize rebound symptoms, a gradual taper works best. One common approach is to reduce the dose by half every one to two weeks. For example, you might go from a full dose daily to half a dose daily, then to a full dose every other day, and finally stop. If symptoms flare during the taper, you go back to the last dose that worked and try again more slowly after six to twelve weeks, reducing by about 25% per month. Some people transition to using a PPI only on days when symptoms appear, which is called on-demand therapy.
Choosing Between Them
For mild, occasional reflux without esophageal damage, a prescription H2 blocker may be sufficient. For moderate to severe GERD, especially with esophagitis, a PPI is the standard starting point. Esomeprazole and rabeprazole have the highest healing rates in comparative studies, but your doctor may start with omeprazole or pantoprazole since they’re widely available and inexpensive, then switch if needed.
Vonoprazan is worth discussing with your doctor if you have trouble timing your PPI before meals, if nighttime reflux is your biggest problem, or if you’ve tried PPIs without adequate relief. Its faster onset and stronger overnight acid control give it a real edge in those situations, though it’s newer and typically costs more.
Individual response varies more than most people expect. Two people with identical symptoms can respond differently to the same drug. If your first prescription doesn’t fully control your reflux after four to eight weeks, switching to a different medication in the same class, moving to a stronger class, or adjusting the dose are all reasonable next steps.