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Antidepressant switching among adherent patients treated for depression
Steven C Marcus1, Mariam Hassan, Mark Olfson
1School of Social Policy and Practice, University of Pennsylvania, Philadelphia, PA, USA.
Psychiatric Services (Washington, D.C.)
|May 5, 2009
Summary
Antidepressant switching is common in early depression treatment. Factors like illness severity and initial dosage influence medication changes, impacting patient outcomes.
Area of Science:
- Psychiatry
- Pharmacology
- Health Services Research
Background:
- Antidepressant therapy is a cornerstone in managing depressive disorders.
- Understanding factors influencing treatment adherence and modification is crucial for optimizing patient care.
Purpose of the Study:
- To investigate pharmacologic, clinical, and demographic predictors of antidepressant switching within the initial three months of outpatient depression treatment.
Main Methods:
- A cohort analysis of 56,521 adult outpatients diagnosed with depression was conducted using administrative data from 2001-2006.
- Antidepressant switching was defined as initiating a second antidepressant within 90 days and continuing it for at least 15 days after the first was terminated.
Main Results:
- 8.6% of patients switched antidepressants within 90 days.
- Switching rates varied by initial medication, with trazodone (47.4%) and TCAs (26.6%) having higher rates than venlafaxine (6.5%) or sertraline (7.4%).
- Increased switching was associated with emergency mental health treatment, major depressive disorder (especially severe episodes), and inversely with higher initial antidepressant doses.
Conclusions:
- Medication switching is a frequent occurrence in the early phase of antidepressant treatment for depression.
- Clinical severity and lower initial antidepressant doses are identified as key risk factors for switching.
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