The Organization Against Drugs (OKANA) was established by Law 2161/1993 and began its operation in 1995. It is a private legal entity under the supervision of the Ministry of Health.

OKANA is the largest provider of services in the field of addictions in general, addictive behaviors and addiction in Greece and assumes a key role in the process of formulating and presenting proposals for the drawing up of the National Strategy against Drugs. The Agency contributes to the planning, promotion and implementation of the national anti-drug policy.

The main pillars of OKANA's activities are prevention, treatment, harm reduction - immediate access and the social reintegration of the beneficiaries.

At the same time, OKANA aims to raise public awareness and destigmatize substance abusers.

According to its founding law, OKANA had as its main purposes:

a) the inter-ministerial coordination, planning, promotion and implementation of national policy regarding the prevention, treatment and rehabilitation of substance dependent persons,

b) the study of the problem of substance addictions at the national level, the provision of valid and thorough information and the awareness of the public,

c) the establishment and effective operation of prevention centers, treatment units and social-professional reintegration centers.