The Food and Drug Administration has approved over-the-counter hearing aids to be sold at pharmacies and stores this month.

Drew Angerer/Getty Images(CNN) - Sanofi says it's voluntarily recalling its over-the-counter heartburn drug Zantac in the U.S. and Canada because of concerns of potential cancer risks. The FDA has said that some ranitidine medications -- including those known by the brand name Zantac -- contain low levels of an impurity that could cause cancer. Numerous recalls have been launched as the FDA found "unacceptable levels" of nitrosamines in several of those common drugs containing valsartan. Yet that study also noted that research into long-term cancer risk is needed. "Sanofi encourages anyone using Zantac OTC to speak with their health care providers or pharmacists if they have any additional questions," the company's statement said.