Problem gambling tends to co-occur with unhealthy alcohol use. The researchers did a randomized controlled trial. They looked at if adding a brief feedback on unhealthy alcohol use could improve the effects of a gambling intervention. A total of 282 participants concerned about their gambling and interested in online help took part in the study. They were randomly assigned to either a gambling and alcohol, or gambling only online intervention. It was found that 80.5% and 41.1% met the criteria for problematic gambling and unhealthy alcohol use, respectively. Follow-up rates were 80.1% and 84% at 3 and 6 months. Problem gambling reduced over time for both groups. However, there were no differences between the groups. Unhealthy alcohol use did not reduce over time for both groups. Also, there were no differences in alcohol use between the groups. The interventions helped reduced problem gambling but not unhealthy alcohol use.