Epicriptine or beta-dihydroergocryptine is a dopamine agonist of the ergoline class. It constitutes one third of the mixture known as dihydroergocryptine, the other two thirds consisting of alpha-dihydroergocryptine. The alpha differs from the beta form only in the position of a single methyl group, which is a consequence of the biosynthesis in which the proteinogenic amino acid isoleucine is replaced by leucine. Mesylate salt of dihydro-β-ergocryptine is an active part of the drug: Ergoloid Mesylate, which is used for treatment of symptoms of an idiopathic decline in mental capacity (i.e., cognitive and interpersonal skills, mood, self-care, apparent motivation) can experience some symptomatic relief upon treatment with ergoloid mesylates preparations.