Study	Reason for exclusion
Aldridge 2017	Participants did not meet our inclusion criteria: concurrent problem alcohol use was not an inclusion criterion. Excluded in 2017.
Aldridge 2017b	Participants did not meet our inclusion criteria: concurrent problem alcohol use was not an inclusion criterion. Excluded in 2017.
Bennett 2002	Study design did not meet our inclusion criteria: not an RCT.
Bernstein 2005	Outcome did not meet our inclusion criteria: alcohol use was not measured, because the intervention focused on drug use and the participants were not reported to have problem alcohol use at randomisation.
Bowen 2006	Study design did not meet our inclusion criteria: not an RCT.
Chambers 2016	Participants did not meet our inclusion criteria: concurrent problem alcohol use was not an inclusion criterion. Excluded in 2017.
Cohen 1982	Participants did not meet our inclusion criteria: concurrent problem alcohol use not an inclusion criterion for all subjects randomised into trial. Quote: "Approximately one‐third of all the active alcoholics [n=105] were assigned to each of the three study groups (1983, p864; 1982, p360)." Comment: it is highly probable that non‐alcoholics were randomised into trial. Operative alcoholics (N = 105) versus all subjects randomised into trial (N = 127).
Darker 2016a	Study design did not meet our inclusion criteria: concurrent problem alcohol use was not an inclusion criterion. Excluded in 2017.
Drumright 2011	Study design did not meet our inclusion criteria: not an RCT. A secondary analysis of 2 RCTs that did not have concurrent problem alcohol use not an inclusion criterion
Karno 2017	Participants did not meet our inclusion criteria: concurrent problem alcohol use was not an inclusion criterion. Excluded in 2017.
Kennedy 2016	Participants did not meet our inclusion criteria: concurrent problem alcohol use was not an inclusion criterion. Excluded in 2017.
Moyers 2016	Participants did not meet our inclusion criteria: concurrent problem alcohol use was not an inclusion criterion. Excluded in 2017.
O'Farrell 2008	Participants did not meet our inclusion criteria: participants were eligible if they had alcohol dependence diagnosis with or without comorbid drug diagnosis.
Worden 2010	Participants did not meet our inclusion criteria: concurrent problem alcohol use was not an inclusion criterion. Additionally, 46.6% reported alcohol as their primary drug (review exclusion criterion).

RCT: randomised controlled trial.