FAQs About NDMA and the Recalls of Zantac, Metformin and More

FAQs About NDMA and the Recalls of Zantac, Metformin and More
FAQs About NDMA and the Recalls of Zantac, Metformin and More
Emma Yasinski
Emma Yasinski Staff Writer

Over the past decade, the Food and Drug Administration (FDA) has initiated or supported recalls on a handful of drugs, including metformin, ranitidine (Zantac), angiotensin II receptor blockers (ARB) (valsartan, losartan and irbesartan), varenicline (Chantix), rifampin (Rifadin) and rifapentine (Priftin) — which treat gastroesophageal reflux disease (GERD) and other conditions, such as heart disease and high blood pressure and aid in smoking cessation. These drugs that treat a variety of conditions have been found to contain the same chemical contaminant: N-nitrosodimethylamine (NDMA), which may cause cancer.

MedShadow answers frequently asked questions about the chemical itself and the drugs that contain it.

Why Is NDMA Bad?

The FDA considers ranitidine a “probable carcinogen.” Animal studies have linked higher exposures of the chemical to increased cancer risk in animals, but those observations have not yet been confirmed in humans. Everyday, we are exposed to NDMA through water and food, but the lower levels in these substances are not thought to be dangerous.

How Does NDMA Get Into Drugs?

The Zantac recall started in 2019, when the online pharmacy Valisure reported that it found “extremely high levels” of NDMA in ranitidine products. In the FDA’s testing, it also found NDMA, though at much lower levels than the pharmacy had.

Nonetheless, the scientists noted that the levels of NDMA increased the longer the drug sat on shelves, and that hotter conditions caused an even greater rise. Those two different results make sense, because Valisure tested the drug at a higher temperature than the FDA did.

Because of the risk of increasing NDMA levels over time, Janet Woodcock, MD, director of the FDA’s Center for Drug Evaluation and Research, said in a press release that the FDA would stand by its recall. “We didn’t observe unacceptable levels of NDMA in many of the samples that we tested. However, since we don’t know how or for how long the product might have been stored, we decided that it should not be available to consumers and patients unless its quality can be assured.”

Why Is Zantac Still on Pharmacy Shelves? Is It Safe?

The Zantac you see in stores now is not contaminated with NDMA. There are two common types of daily GERD medications: 

  • H2 blockers, such as famotidine (Pepcid and the newly-released Zantac 360), cimetidine (Tagamet), ranitidine (Zantac’s drug in pre-2019 recall) and nizatidine (Axid) 
  • Proton pump inhibitors (PPIs), including omeprazole (Prilosec, Prilosec OTC, Zegerid), lansoprazole (Prevacid), pantoprazole (Protonix), rabeprazole (Aciphex), esomeprazole (Nexium) and dexlansoprazole (Dexilant).

Both work by suppressing your body’s production of stomach acid through two different chemical mechanisms.

Before Zantac was recalled two years ago, its H2 blocker was ranitidine. Following the recall, Zantac’s manufacturer, Sanofi started using a different ingredient, famotidine and renamed the product Zantac 360. 

Zantac 360’s latest packaging states that it now has a “new formulation” of the previous drug. But, “It’s not a new formulation,” writes Josh Bloom in the Genetic Literacy Project. “It’s a different drug.”

Still, it’s a familiar drug. Famotidine is a different H2 blocker, one that the FDA has not found to be contaminated with NDMA, which is used in another GERD drug, Pepcid.

What Should I Do If My Treatments Have Been Recalled?

It’s best to contact your physician or pharmacist right away any time a drug you use has been recalled. In most cases they will recommend you continue using your current treatment until they find you an alternative. If you’ve been using an over-the-counter version of Zantac, the FDA says there are several similar drugs that may work just as well for you. It has not found NDMA in famotidine (Pepcid), cimetidine (Tagamet), esomeprazole (Nexium), lansoprazole (Prevacid) or omeprazole (Prilosec).

To stay up to date on drug recalls, sign up for email lists, follow FDA Twitter announcements or search the FDA database.


DISCLAIMER: MedShadow provides information and resources related to medications, their effects, and potential side effects. However, it is important to note that we are not a substitute for professional medical advice, diagnosis, or treatment. The content on our site is intended for educational and informational purposes only. Individuals dealing with medical conditions or symptoms should seek guidance from a licensed healthcare professional, such as a physician or pharmacist, who can provide personalized medical advice tailored to their specific circumstances.

While we strive to ensure the accuracy and reliability of the information presented on MedShadow, we cannot guarantee its completeness or suitability for any particular individual's medical needs. Therefore, we strongly encourage users to consult with qualified healthcare professionals regarding any health-related concerns or decisions. By accessing and using MedShadow, you acknowledge and agree that the information provided on the site is not a substitute for professional medical advice and that you should always consult with a qualified healthcare provider for any medical concerns.

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