Killing H. pylori requires a combination of antibiotics and an acid-suppressing medication, taken together for 14 days. No single antibiotic can do it alone, and no natural remedy has been shown to fully eradicate the infection by itself. The good news: with the right regimen, treatment succeeds in the vast majority of cases, and a simple breath test afterward confirms the bacteria are gone.
Why You Need Multiple Drugs at Once
H. pylori lives in the mucus lining of the stomach, where the extremely acidic environment actually protects it from many antibiotics. The first step in any treatment plan is an acid-suppressing drug (a proton pump inhibitor, or PPI) that dials down stomach acid so the antibiotics can reach and kill the bacteria more effectively. The antibiotics then attack H. pylori through different mechanisms simultaneously, making it much harder for resistant strains to survive.
Treatment lasts 14 days in most current regimens. Shorter courses were once common, but longer treatment has proven more reliable. Finishing the entire course matters: stopping early is one of the main reasons the infection comes back.
First-Line Treatment Options
The landscape of H. pylori treatment has shifted significantly in recent years. The old standby, clarithromycin-based triple therapy (a PPI plus clarithromycin plus amoxicillin), is no longer the default first choice in updated American College of Gastroenterology guidelines. The reason is straightforward: resistance to clarithromycin has risen sharply, which means that regimen now fails more often than it used to.
Current preferred options for a first treatment include:
- Bismuth quadruple therapy: A PPI, bismuth (the active ingredient in Pepto-Bismol), plus two antibiotics (tetracycline and metronidazole), taken for 14 days. This regimen sidesteps the clarithromycin resistance problem entirely.
- Vonoprazan-amoxicillin dual therapy: A newer acid suppressor called vonoprazan paired with amoxicillin alone. Because amoxicillin resistance remains extremely low (around 1% of strains), this simpler two-drug regimen works well for most people who aren’t allergic to penicillin.
- Concomitant therapy: A PPI plus three antibiotics (clarithromycin, amoxicillin, and a nitroimidazole) for 10 to 14 days. Using three antibiotics at once helps overcome resistance to any single one.
Your doctor will choose among these based on local resistance patterns, any drug allergies you have, and whether you’ve taken certain antibiotics before. If you’ve used clarithromycin for any reason in the past, your risk of carrying resistant bacteria is higher, and your doctor will typically avoid it.
What Happens if the First Round Fails
About 10 to 20 percent of people still test positive after their first treatment course. When that happens, the key rule is simple: don’t repeat the same antibiotics. Bacteria that survived the first round are likely resistant to those drugs.
Salvage therapy follows a swapping strategy. If your first regimen contained clarithromycin, the next attempt typically uses bismuth quadruple therapy or a levofloxacin-based regimen instead. If you started with bismuth quadruple therapy, clarithromycin or levofloxacin regimens become the backup. These salvage courses also run for 14 days. In rare cases where multiple rounds fail, a regimen built around rifabutin or high-dose amoxicillin may be tried.
Confirming the Infection Is Gone
You should always verify that H. pylori has been eradicated after treatment. The standard method is a urea breath test or a stool antigen test, both of which are noninvasive. The critical detail is timing: you need to wait at least four weeks after finishing your antibiotics before testing. Testing too soon can produce a false negative, where the bacteria appear gone but are simply suppressed to undetectable levels. Some research suggests testing at two weeks may be nearly as accurate, but four weeks remains the standard recommendation.
You’ll also need to stop taking any PPI for one to two weeks before the test, since acid suppression can interfere with the results. Your doctor will give you specific instructions on when to pause medication.
Side Effects and How to Manage Them
Taking multiple antibiotics for two weeks is hard on the digestive system. Common side effects include nausea, diarrhea, a metallic taste in the mouth, stomach cramps, and darkened stools (especially with bismuth-containing regimens, which is harmless). These side effects are the most common reason people stop treatment early, so it helps to know what to expect.
Adding probiotics during treatment can help. A meta-analysis of clinical trials found that the yeast-based probiotic Saccharomyces boulardii significantly reduced side effects, cutting them by roughly two-thirds compared to placebo. Several Lactobacillus species, including L. acidophilus and L. casei, were also associated with modestly higher eradication rates when taken alongside antibiotics. Probiotics don’t replace antibiotics, but they can make the two weeks more tolerable and may give treatment a slight boost.
What About Natural Remedies?
Many people search for ways to kill H. pylori without antibiotics. Several natural substances show activity against the bacteria in lab settings or small clinical trials, but none has been proven to fully eradicate an active infection on its own.
Mastic gum, a resin from a Mediterranean tree, is one of the most studied. In a double-blind trial of 48 people with H. pylori gastritis, chewing mastic gum three times daily for 90 days significantly reduced bacterial levels measured by breath testing and improved stomach inflammation. But reducing bacterial load is different from complete eradication, and the study used mastic gum over a much longer period than standard antibiotic therapy.
Cranberry, broccoli sprouts (which contain a compound called sulforaphane), garlic, and green tea have all shown some anti-H. pylori effects in early research. These may be useful as complementary support, particularly for people who aren’t yet ready for treatment or who want to reduce bacterial burden alongside antibiotics. But relying on them as your sole treatment risks letting the infection persist and cause ongoing damage to the stomach lining, including ulcers and, over many years, an increased risk of stomach cancer.
Diet During Treatment
What you eat during the 14-day treatment window won’t kill or cure H. pylori, but it can make a real difference in how you feel. Fried and greasy foods tend to worsen nausea and stomach pain. Spicy foods, alcohol, and caffeine can irritate an already inflamed stomach lining, so dialing those back during treatment is sensible.
Lean proteins, cooked vegetables, whole grains, and fermented foods like yogurt or kefir are generally well tolerated. Smaller, more frequent meals can also reduce nausea. Some people find that eating a small snack before taking their medications helps buffer the stomach and reduce queasiness. Staying well hydrated is especially important if diarrhea becomes an issue.
Why Treating H. Pylori Matters
H. pylori infects roughly half the world’s population, and many carriers never develop symptoms. But in those who do, the bacteria erode the protective mucus layer of the stomach, leading to chronic gastritis, peptic ulcers, and in a small percentage of long-term infections, stomach cancer. Eradicating the infection heals existing ulcers, prevents recurrence, and substantially lowers cancer risk. Once successfully treated, reinfection rates in adults are low, typically under 5% per year in developed countries.