https://www.scientificamerican.com/article/possible-carcinogen-found-in-a-common-heartburn-medication-is-present-in-some-foods/

Novartis International’s Sandoz division, which manufactures ranitidine, a generic form of the heartburn drug Zantac, has halted its distribution over concerns that it may be contaminated with low levels of a probable carcinogen. Sandoz has also issued a recall of the drug in Canada and parts of Europe. The U.S. Food and Drug Administration released a statement last week saying some ranitidine medicines, including the brand-name drug Zantac, contain traces of N-nitrosodimethylamine (NDMA). The FDA said NDMA levels found in the medications in early tests are not much higher than those in some common foods—but it is still investigating the potential risk to patients.

Zantac and other ranitidine drugs are used to prevent and treat gastroesophageal reflux and stomach ulcers. The medications come in both prescription and over-the-counter forms.