Vilnius Centre for Addictive Disorders has been providing outreach services for almost two decades. It started with a handful of street outreach workers, who implemented syringe and needle (NSP) exchange. Later, NSP was provided with a help of a needle exchange van, and today it is a fully equiped mobile clinic working to address the issues. Each day, the Mobile Unit visits several areas of the city which are either heavily affected by drug use or have the highest concentration of sex-workers. The clinic aims to prevent the transmission of HIV and other bloodborne viruses which are highly prevalent among these vulnerable populations, but it also has multiple other functions. The team of the Mobile Unit – social workers and a nurse – provide syringe and needle exchange services, medical care, inform the clients on safer injection practices and behaviours, distribute condoms and information and education materials, consult on social and legal matters, work to motivate clients to seek treatment. Service are available to everyone and no personal identification documents are required. During the years of functioning, the Mobile Unit has greatly contributed to HIV and hepatitis C prevention in the country and referred over 6000 people to treatment, which makes the Unit one of the most efficient programmes implemented by Vilnius Centre for Addictive Disorders.