Getting rid of H. pylori requires a combination of antibiotics and acid-suppressing medication taken for 14 days. This bacterium burrows into the stomach lining where a single antibiotic can’t reliably reach it, so treatment uses multiple drugs working together. The good news: with the right regimen, eradication rates run between 79% and 86%, and most people only need one round of treatment.
The Standard Treatment Regimen
The current recommended first-line treatment for H. pylori is called bismuth quadruple therapy, or BQT. It combines four medications taken for 14 days: an acid-suppressing drug (called a proton pump inhibitor) twice daily, tetracycline four times daily, metronidazole three or four times daily, and bismuth (the active ingredient in Pepto-Bismol) four times daily. This is what your doctor will most likely prescribe if you haven’t been treated for H. pylori before.
If you’ve heard of a simpler three-drug regimen using clarithromycin, that approach has fallen out of favor. Resistance to clarithromycin now exceeds 15% in many countries, which is the threshold where it stops being reliable enough to prescribe without testing. The American College of Gastroenterology specifically recommends against using clarithromycin-based triple therapy unless a sensitivity test has confirmed the bacteria will respond to it.
Alternative Options
Two alternative regimens exist for people who can’t take the standard quadruple therapy. Rifabutin-based triple therapy is one option, also taken for 14 days. The other is a newer approach using vonoprazan, a more potent acid blocker that raises stomach pH faster and higher than traditional acid-suppressing drugs. By keeping the stomach less acidic, vonoprazan helps the antibiotics work more effectively.
A 2022 clinical trial found that vonoprazan-based regimens outperformed traditional acid-suppressor-based triple therapy overall, and the difference was especially notable in patients carrying clarithromycin-resistant strains. Vonoprazan dual therapy (just the acid blocker plus amoxicillin) achieved a 78.5% eradication rate, while vonoprazan triple therapy hit 84.7%. Both are viable 14-day courses, though vonoprazan is newer and may not be available everywhere.
What the 14 Days Feel Like
Fourteen days of multiple antibiotics is not a pleasant experience, and knowing what to expect makes it easier to stick with the full course. The most common side effects across the regimen are nausea, loose stools, and a metallic taste in your mouth. Metronidazole is the main culprit behind the metallic taste and nausea. Clarithromycin, if you’re on a regimen that includes it, alters how things taste. Bismuth will turn your stool dark or black and can temporarily darken your tongue. Both of these effects are harmless and disappear once you stop taking it.
One firm rule: do not drink alcohol while taking metronidazole. The combination can cause low blood pressure, heart palpitations, and chest pain. Plan to stay alcohol-free for the full treatment course and at least 48 hours afterward.
How Probiotics Can Help
Adding probiotics during treatment can meaningfully improve both your comfort and your odds of clearing the infection. A meta-analysis of probiotic use alongside bismuth quadruple therapy found that probiotics raised eradication rates from 78.6% to 85.5% and cut treatment-related side effects roughly in half. Diarrhea and nausea saw the biggest reductions.
Not all probiotics are equally useful here. The analysis found that only Saccharomyces boulardii (a beneficial yeast, not a bacteria) and multi-strain probiotic formulations significantly boosted eradication rates. Single-strain Lactobacillus or Bifidobacterium supplements showed no statistically significant benefit. Timing also matters: the probiotics need to be taken alongside the antibiotics to work. Starting them before treatment or continuing them after treatment provided no additional benefit.
Look for a supplement that specifically lists Saccharomyces boulardii or contains multiple strains. Fermented foods like yogurt, kefir, sauerkraut, and kombucha also contribute probiotic organisms, though in lower and more variable amounts than a dedicated supplement.
Diet During Treatment
Your diet won’t kill H. pylori on its own, but eating strategically during treatment reduces stomach irritation and supports the healing process. The core principle is minimizing anything that triggers extra acid production or inflames the stomach lining.
Prepare meats and fish by boiling or sautéing in olive oil rather than frying. Omega-3 and omega-6 fatty acids from fish oil and olive oil may help reduce stomach inflammation. Honey has demonstrated antibacterial properties that could offer a mild additional effect against H. pylori. Avoid spicy foods, acidic foods, caffeine, and alcohol during the treatment period. These won’t interfere with the antibiotics directly, but they can worsen the nausea and stomach discomfort you’re already managing.
Confirming the Infection Is Gone
After finishing treatment, you need a follow-up test to confirm the bacteria have been eradicated. The two most common options are a urea breath test and a stool antigen test. Both are noninvasive.
The critical detail is timing. Testing too soon after finishing antibiotics risks a false-negative result, where the bacteria are suppressed but not eliminated, and the test incorrectly shows you’re clear. The standard recommendation is to wait at least four weeks after completing your antibiotic course before testing. Some research suggests that testing at two weeks can be equally accurate, but four weeks remains the widely accepted guideline. You’ll also need to stop taking any acid-suppressing medication for one to two weeks before the test, as these drugs can also cause false negatives.
If the First Round Doesn’t Work
About 15% to 20% of people don’t clear the infection on the first attempt. If your follow-up test comes back positive, your doctor will typically prescribe a second round using a different combination of antibiotics. The preferred approach for a second attempt is bismuth quadruple therapy again (if you haven’t already used it) or a regimen guided by antibiotic sensitivity testing, which identifies exactly which drugs your particular strain of H. pylori responds to.
The most important factor in successful eradication, whether first or second round, is completing the full 14-day course. Stopping early because you feel better or because the side effects are unpleasant is the most common reason treatment fails. If side effects are severe, call your doctor to discuss options rather than stopping on your own.