List of products in the National Drug Code with proprietary name . This medication is used along with other treatment for certain blood vessel diseases (e.g., arteriosclerosis obliterans, Raynaud's disease, Buerger's disease, cerebrovascular insufficiency). It works by widening blood vessels to help increase blood flow (improve circulation) to certain parts of the body (such as the hands/feet, brain). This effect may help to decrease symptoms such as cold hands and feet, numbness, tingling, and decreased memory or judgment.