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Short answer What does it treat? How do you take it? Side effects to know Who should not take it? When is it an emergency? What a Pymander AI doctor consult looks like Common questions Sources Related questionsZantac (ranitidine) was withdrawn from the entire US market in April 2020, prescription and over-the-counter, because the drug itself was breaking down into a probable carcinogen.
If you find an old bottle in a cabinet, do not take it. The good news: the replacement, famotidine, is cheap, safe, and sitting on the same pharmacy shelf, and the "Zantac 360" products sold today actually contain famotidine.
What does it treat?
Ranitidine treated heartburn, acid reflux, ulcers, and excess-acid conditions for four decades as an H2 blocker. What it treats now is nothing: it no longer exists legally in the US. This page exists because millions of people still search for it, still have old bottles, and still need to know what happened and what to use instead.
How do you take it?
You do not. On April 1, 2020, the FDA requested the immediate withdrawal of all ranitidine products after confirming that NDMA (N-nitrosodimethylamine, a probable human carcinogen) accumulates in ranitidine over time, even under normal storage, and increases significantly at higher temperatures. The impurity is baked into the molecule's instability, not one bad factory, so no safe ranitidine supply was possible. The replacement routine: famotidine (Pepcid, or the rebranded Zantac 360) once or twice daily, or 15 to 60 minutes before a trigger meal for prevention; PPIs like omeprazole for daily severe reflux.
Side effects to know
The ranitidine question: the FDA framed the risk as unacceptable NDMA exposure from a degrading product, not proof that past users were harmed; NDMA is the same impurity family behind the valsartan and metformin recalls. If you took ranitidine for years, the honest answer is that individual risk is low, but screening questions belong with your doctor.
Famotidine (the replacement): remarkably mild: occasional headache, dizziness, constipation or diarrhea. Confusion in severe kidney disease is the one caution flag for older patients.
Who should not take it?
Everyone, for ranitidine: it is withdrawn, full stop. For famotidine, the cautions are kidney disease (lower the dose) and stacking multiple heartburn medicines at once. Pregnant patients with reflux: famotidine is the H2 blocker clinicians generally reach for, but that call belongs to your own clinician.
When is it an emergency?
In an emergency, call 911Whatever the antacid, the red flags do not change: vomiting blood, black tarry stools, chest pain (never assume it is reflux), trouble swallowing, or unintended weight loss get emergency evaluation. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
How our AI doctor decides when to send you to care ›What a Pymander AI doctor consult looks like
Common questions
Why was Zantac actually recalled?
Not one bad batch: the FDA found that ranitidine itself degrades into NDMA, a probable human carcinogen, and that the levels climb over time and with heat, even under normal storage. Since the instability was in the molecule, not the factory, the agency requested withdrawal of every ranitidine product, prescription and OTC, on April 1, 2020.
I took Zantac for years. Should I be worried?
The FDA's action was framed as preventing unacceptable future exposure, not as proof of harm in past users; the agency noted NDMA levels it found would not be expected to raise cancer risk much above everyday background exposure. If you took it heavily for years, that is a fair thing to raise at your next physical, but it is not a reason to panic.
What replaced ranitidine?
Famotidine (Pepcid), the other mainstream H2 blocker, and it is arguably better: more potent per milligram, no NDMA instability, OTC and cheap. The brand "Zantac 360" on shelves now is famotidine wearing the old name. For daily severe reflux, PPIs like omeprazole are the step up.
Is the Zantac on store shelves now safe?
Yes, because it is not ranitidine. Products sold as Zantac 360 contain famotidine; the ranitidine formulations remain withdrawn. Check the active ingredient line on any box: if it says famotidine, it is the replacement, not the recalled drug.
Is famotidine the same kind of drug as ranitidine?
Same class (H2 blockers, which reduce acid production), different molecule. Famotidine does not share ranitidine's instability problem. Dosing is once or twice daily, or 15 to 60 minutes before a known trigger meal for prevention, per MedlinePlus.
Can I still finish my old ranitidine bottle?
No. The FDA told consumers to stop taking it and dispose of it. The NDMA content grows with age and storage temperature, so a lingering bottle is precisely the higher-exposure scenario. Any pharmacy can point you to famotidine as the direct swap.