Brief interventions are short discussions between a practitioner and service user about a potentially harmful lifestyle choice like substance use. They aim to motivate change, reduce harmful behavior, and assist recovery. NICE defines different types including opportunistic contacts to deliver health information or motivational counseling, and planned sessions targeting specific harms or motivation to change. Key features are focusing on reduced substance use, being delivered by non-substance professionals, addressing motivation, and remaining individualized while giving feedback, encouraging responsibility, providing options, demonstrating empathy, and enhancing self-efficacy. Brief interventions can be used for any potentially harmful lifestyle behavior by providing information, advice, discussions, or offers of support. Evidence best supports their use for problematic alcohol use.