If multiple antidepressants haven't worked for you, you're not alone and you're not out of options. Why Antidepressants Fail: Lessons from the STAR*D Study Treatment-resistant depression (TRD) is a complex challenge in mental health, characterized by patients' inadequate response to standard antidepressant therapies. The landmark STAR*D study, which extensively evaluated treatment strategies for depression, revealed that a significant percentage of individuals do not respond