The original Zantac, which contained the active ingredient ranitidine, is no longer on the market. The FDA requested the removal of all ranitidine products in April 2020 after finding that the drug produced increasing levels of a probable carcinogen over time. However, a reformulated product called Zantac 360 hit shelves in 2022 with a completely different active ingredient, famotidine, and is currently available over the counter.
Why the Original Zantac Was Pulled
In April 2020, the FDA requested that all manufacturers withdraw ranitidine products from the U.S. market. The problem wasn’t a manufacturing defect that could be fixed. Testing revealed that ranitidine itself breaks down into NDMA, a chemical classified as a probable human carcinogen. NDMA levels in ranitidine tablets increased the longer they sat on a shelf and rose further when stored above room temperature, which routinely happens during shipping, warehouse storage, and in medicine cabinets at home.
The FDA set an acceptable daily NDMA intake limit at 96 nanograms. Lab tests showed that some ranitidine products exceeded that threshold under normal storage conditions, and the numbers climbed significantly with heat and age. Because there was no reliable way to keep NDMA levels safe throughout a product’s shelf life, the FDA pulled the entire class of ranitidine drugs, both brand-name and generic, prescription and over-the-counter.
The European Medicines Agency took the same step, suspending all ranitidine medicines across the EU in April 2020. No country has reversed that decision.
What Zantac 360 Actually Contains
The Zantac brand returned in a reformulated version called Zantac 360, which uses famotidine instead of ranitidine. These are two different drugs. Famotidine is the same active ingredient found in Pepcid, and it has not been found to produce NDMA. The reformulated product was officially designated in August 2022 and is available in 10 mg and 20 mg tablets.
So if you see Zantac on a pharmacy shelf today, it’s the famotidine version. The box will say “Zantac 360” and list famotidine as the active ingredient. It works the same general way the old version did, blocking histamine receptors in the stomach to reduce acid production, but it does so with a different molecule that doesn’t carry the contamination risk.
How to Use Zantac 360
The maximum strength version (20 mg) can be taken two ways. To relieve heartburn you’re already experiencing, swallow one tablet with water. To prevent heartburn before a meal, take one tablet 10 to 60 minutes before eating or drinking whatever tends to trigger your symptoms. The limit is two tablets in 24 hours, and the product is approved for adults and children 12 and older.
Safety of the New Formulation
Famotidine has a long track record. It has been sold as Pepcid for decades, and no NDMA contamination has been detected in famotidine products. Dr. Kyle Staller, a gastroenterologist at Massachusetts General Hospital, has noted that H2 blockers as a class carry no significant long- or short-term health risks.
One thing to be aware of: a related H2 blocker called cimetidine (sold as Tagamet) can interfere with blood thinners, antidepressants, and blood pressure medications. Famotidine does not share that interaction profile, which is one reason it became the dominant H2 blocker on the market.
Other Options for Acid Reflux
If Zantac 360 doesn’t fully control your symptoms, or if you deal with chronic acid reflux (GERD), there are two other paths worth knowing about.
- Other H2 blockers: Famotidine is also sold as Pepcid and is available both OTC and by prescription at higher doses. Cimetidine (Tagamet) is another OTC option, though it has more drug interactions. Nizatidine (Axid) requires a prescription.
- Proton pump inhibitors (PPIs): These are stronger acid suppressors than H2 blockers. They take longer to kick in, sometimes a few days to reach full effect, but they reduce acid production more powerfully and are better suited for ongoing GERD. Common OTC options include omeprazole (Prilosec) and esomeprazole (Nexium).
H2 blockers like Zantac 360 work well for occasional heartburn and act relatively quickly. PPIs are the better choice if you need daily acid control over weeks or months. The two classes can also be used together in some cases, with the H2 blocker providing faster short-term relief while the PPI builds up its longer-lasting effect.