GlaxoSmithKline chose to stop making Eskalith and Eskalith CR. This was most likely a financial decision. Often, it is not profitable for a manufacturer to continue to produce a brand-name drug once the patents have expired and generic versions are available. This is especially true of older medications, such as lithium. Typically, most people choose to purchase the generic medication, either because it is less expensive or because insurance companies require it. With such a small market left for the brand-name product, the manufacturer often decides to stop making it.