An Addiction Nurse Practitioner (ANP) is an advanced practice registered nurse (APRN) who specializes in treating patients with substance use disorders. They assess, diagnose, and develop treatment plans that may include medications, counseling, and behavioral therapies. ANPs work in various settings, such as hospitals, rehabilitation centers, and outpatient clinics, collaborating with healthcare teams to support recovery. Their role includes patient education, relapse prevention strategies, and monitoring treatment effectiveness.