Drinks:Ration - Combat Stress Randomized Controlled Trial

Drinks:Ration (www.drinksration.app; formerly called InDEx) app has been developed following the Medical Research Council Complex Intervention Guidelines and using co-design methodology by the King's Centre for Military Health Research (at King's College London) and the University of Liverpool, supported by experts in smartphone app development, epidemiology, addiction psychiatry, and military mental health. The app is designed to support veterans drinking at a hazardous or harmful level by providing detailed advice and support over a minimum of 28-day period. The app is theoretically underpinned to enhance participants motivation and self-efficacy in modifying their alcohol consumption by means of Behaviour Change Theory in the content displayed, and the messaging sent to participants.