1. What Is Major Depressive Disorder (MDD)?

2. Differential Diagnosis: Medical Conditions

3. Differential Diagnosis

4. DSM-5 Criteria for the Diagnosis of MDD

5. Self-Reported Scales for Measuring Specific Components of MDD

6. Example Depression Screening Tools

7. PHQ-9: The Screening Questionnaire

8. PHQ-9: A Patient-Reported Outcome

9. Factors to Consider When Selecting an Antidepressant

10. What to Do When Patients Have Inadequate Response to First-Line Antidepressants

11. Inadequate Response: Switch to Another Antidepressant or Add an Adjunctive Medication?

12. Shared Decision-Making Tips and Resources

13. Abbreviations