Dihydroergotoxine mesylate is primarily used in the management of cognitive decline associated with aging, such as in cases of dementia or Alzheimer's disease. It works by improving cerebral blood flow and enhancing neurotransmitter activity, which helps in alleviating symptoms like memory loss, confusion, and difficulty concentrating. Additionally, it is employed in treating peripheral vascular disorders, aiding in the reduction of symptoms like cold extremities and intermittent claudication by improving blood circulation. Its neuroprotective properties also make it beneficial in mitigating the effects of stroke or brain injury by supporting neuronal function and recovery.