This report investigates the effectiveness of SSRI antidepressants in treating major depressive disorder using an evidence-based practice approach. The study utilizes the PICOT format to formulate a research question and searches databases like Medline to gather relevant articles. The report analyzes two key articles: a primary observational study on SSRI side effects and a secondary systematic review on SSRI efficacy, along with reasons for excluding other studies. The findings suggest that while SSRIs can improve symptoms, they also carry potential side effects. The report concludes that, based on the selected research, SSRIs are an efficient treatment option for major depressive disorders, while acknowledging the need to consider the associated risks. The report also offers valuable insights into the pros and cons of using SSRI antidepressants as a treatment for patients with major depressive disorders and extreme negative thoughts.