Treatment-refractory depression, also known as treatment-resistant depression (TRD), is a severe form of major depressive disorder (MDD) that does not respond adequately to standard treatments.

Obsessive-Compulsive Disorder (OCD) is a mental health condition characterized by intrusive, unwanted thoughts (obsessions) and repetitive behaviors or mental acts (compulsions) performed to reduce anxiety caused by these thoughts.

Characterized by persistent feelings of sadness, hopelessness, and a lack of interest in activities once enjoyed, adolescent depression can interfere with daily life, academic performance, and social interactions.

Anxious depression is a subtype of depression characterized by the coexistence of depressive symptoms and significant anxiety.

Geriatric depression refers to depression occurring in older adults, typically those aged 65 and older