Letter -Eskalith CR (lithium carbonate) FDA posts safety alerts, public health advisories, press releases and other notices from companies as a service to health professionals, consumers and other interested parties. Although FDA approves medical products, FDA does not endorse either the product or the company. Long-term stability data are necessary to show that the tablets will still effectively dissolve in the GI tract after they have been stored for a period of time. Collection of these data is a standard practice in obtaining FDA approval for new sites of manufacture and in determining acceptable shelf-life for drug products.