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Administration of antidepressants. Single versus split dosing: a meta-analysis
1Harvard Medical School, Massachussets General Hospital, Bipolar Clinic and Research Program, Boston, MA, USA. aysegul.yildiz@deu.edu.tr
Journal of Affective Disorders
|October 2, 2001
Summary
Single daily dosing of antidepressants is as effective as multiple daily doses. This suggests that sustained drug levels are not essential for therapeutic antidepressant effects, simplifying treatment and improving compliance.
Area of Science:
- Pharmacology
- Psychiatry
- Clinical Therapeutics
Background:
- Antidepressant efficacy is often linked to dosing schedules.
- The necessity of sustained therapeutic serum levels for antidepressants is debated.
Purpose of the Study:
- To compare the efficacy of single daily dosing versus multiple daily dosing of antidepressants.
- To determine if sustained serum levels are required for antidepressant activity.
Main Methods:
- A meta-analysis of 22 studies comparing single versus multiple daily antidepressant dosing.
- Subgroup analysis based on antidepressant half-life (short, intermediate, long).
Main Results:
- No significant difference in therapeutic efficacy was found between single and multiple daily dosing.
- Improvement rates in depression scores were nearly identical for both dosing strategies.
- This held true regardless of the antidepressant's half-life.
Conclusions:
- Single daily dosing of antidepressants is sufficient for achieving therapeutic effects.
- Sustained therapeutic serum levels are not necessary; a limited duration of exposure above a threshold may suffice.
- Single daily dosing offers advantages in simplicity, compliance, and reduced adverse effects, potentially increasing treatment success rates.