Table 1 Inclusion and exclusion criteria and reasoning

- Minimal age of 18 years

To ensure a minimal age of participation

- Cocaine use > 2 occasions in the last 30 days

To include occasional users in order to provide extended study validity

Exclusion Criteria

Reasoning

- Participation in other psycho-social or pharmacological treatments for the reduction/cessation of cocaine use

To avoid confounding of treatment effects

- Opioid use in the last 30 days (exception: substitution maintenance treatment for opioid dependence without heroin use in the last 30 days)

To avoid confounding of drug effects

- Ever been in treatment for cardiovascular problems or apoplexy

To avoid subjects with these problems entering the study

- BDI-V score > 45

To avoid subjects with serious symptoms of depression entering the study