Some people took Zantac every day for years to treat their heartburn. Others only took it on an as-need basis. Whether you took Zantac for years or just a few times, you may qualify to file a lawsuit against the medication’s manufacturer. That’s because, once indigested, the NDMA in the drug increases to unsafe levels, causing some people to develop cancer. In this sense, it doesn’t matter how frequently you took the drug.