This eBook is the premier volume of our "Mental Illness/Central Nervous System" series, focussing specifically on " DEPRESSIVE DISORDERS". This eBook release encompasses diagnoses such as disruptive mood dysregulation disorder (DMD), major depressive disorder, persistent depressive disorder (PDD), premenstrual dysphoric disorder, substance/medication-induced depressive disorder (SIDD), and depressive disorder due to another medical condition (specified and unspecified. The content comprises a total of 234 "MCQs with Guiding Answers" and 537 "Linked References". This eBook also contains numerous "Study Highlights or Summary Keypoints" alongside the "CLINICAL PRACTICE INSIGHTS" section. Our primary clients include medical professionals, clinical pharmacists or PharmDs, nurses, and various other individuals in the healthcare sector, such as mentors, residents, and students. We adhere to conventional design principles for all our sequential eBook publications to circumvent the trend of "hypercoloremia mania" in eBook design. This predominantly employs the official black and white colour scheme. This publication resulted from a collaborative effort with my skilled and dedicated coauthors, namely PharmDs Arwa Alashqar, Kariman Hatem, Duaa Alqhaiwi, Najd Alyasjeen, Leen Albishawi, Areej Al-Manasyeh, Marah Hussein, Dana AlTaweel, Eman Awwad, Alia' Saidan, and Farah Qaryouti.

Corresponding author; Clinical Pharmacy Specialty "MOH'D NOUR" BANI-YOUNES", MSc Clinical Pharmacy, BCPS, BCCCP, BCNSP, BCACP, BCIDP