Book excerpt: Get a quick, expert overview of the key issues surrounding best practices and current consensus on major depressive disorder (MDD). This concise resource by Drs. Roger S. McIntyre, Carola Rong, Mehala Subramaniapillai, and Yena Lee consolidates today’s available information on this complex topic into one convenient resource, making it an ideal, easy-to-digest reference for both psychiatrists and primary care physicians. Covers genetics and epigenetics, brain structural abnormalities, cognition, neuroendocrine alterations, and inflammatory abnormalities as they relate to MDD. Contains chapters on psychiatric comorbidity, pharmacological treatments, neuromodulatory treatments, lifestyle interventions, internet-based/technology-based interventions, and glutamate alterations.