Organization of mental health services is an important factor influencing the effectiveness of these services and also influences the aims and objectives of the mental health policy. Several variables are associated with increase the likelihood of mental health care use; they include sociodemographic variables (e.g. gender, age, sex, race and educational level), access variables (employment, urban residence and health insurance coverage) and significant illness variables (e.g. mood disorders, substance use disorders and perceived need for treatment). There is a debate about which type of variables is more important than others, Rayburn (2005) reports that needs variables are more important than sociodemographic and access variables while Katz (1997) thought that sociodemographic factors are the most important in influencing the use of mental health services. Despite that hospital treatment (including long stay admission) may provide better physical assessment and treatment and decrease vulnerability to physical , sexual and financial exploitation(Thornicroft & Tansella, 1999),community based care for long stay institutional patients can enhance their quality of life if there is a well-planned and well-resourced reprovision program for supervision and adequate use (Leff & Treiman,2000) Also, an important point of debate is the availability of mental health services for patients suffering from co-morbidity of psychiatric disorders with substance use disorders in separate or collaborating settings. It is not known whether one system of care is more advantageous than the others in terms of facilitating treatment for both disorders, clinical studies focus on one system of care only which may provide an incomplete perspective on treatment utilization (Weisner&Schmidt,1995) Review of the international standards of care addresses the gap between