This study is based on the findings that chronic stress, caused in these patients by cocaine dependence, increases the sensitivity of the Hypothalamo-Pituitary-Adrenal (HPA) axis and CNS stress pathways to vasopressin. For their part, oxytocin systems, in chronic stress, acquire an increasing moderating effect on CNS stress system and the HPA axis. Cocaine dependence generates increased responsivity of stress system to oxytocin in the face of depleted oxytocin stores; thus creating an environment where exogenous oxytocin could exert a strong regulatory effect. Intranasal administration provides a convenient method to deliver these small peptides to the brain. Studying the feasibility of this approach, and its applicability to the treatment of cocaine-dependent patients, will be a goal of the study. The main outcome of this study will be the number of consecutive days of abstinence from cocaine after abstinence induction. A secondary outcome will be: Is the acute effect of intranasal oxytocin on desmopressin-induced ACTH secretion associated with the number of days of continued abstinence.