Gender-specific addiction research needed now more than ever: Reflections from 25 years of the NIDA Clinical Trials Network Gender Special Interest Group.

Despite rising rates of substance use disorders (SUD) in women and the narrowing of the SUD gender prevalence ratio in the U.S., large knowledge gaps in gender-specific treatment remain. The NIDA Clinical Trials Network (CTN) Gender Special Interest Group (GSIG) has provided opportunities to bring the gender lens to national multi-site clinical trials, ancillary studies, secondary data analyses, recommendations for data collection and demographic data, among other contributions to CTN and the SUD treatment field. This commentary provides background on gender differences and the knowledge gap, a history of the CTN GSIG, and its accomplishments via gender specific trials and key secondary analyses. The commentary will close with future directions and recommendations for research including improving the inclusion of intersectional identities in recruitment reach and analyses, reproductive health, pregnant and parenting people, and methodological considerations for clinical trials to enhance capacity to collect and understand data related to gender.