Do antidepressants really work? A clinicians' guide to evaluating the evidence.

Area of Science:

• Psychiatry
• Clinical Pharmacology
• Medical Research Methodology

Background:

• Antidepressants are primary treatments for major depressive disorder.
• Recent concerns question the safety and effectiveness of these medications.
• Industry-sponsored research is a key source of efficacy data.

Purpose of the Study:

• To review methods of antidepressant efficacy studies.
• To critically evaluate industry-sponsored research.
• To assess the validity of current evidence for antidepressant effectiveness.

Main Methods:

• Review of methodologies in antidepressant efficacy trials.
• Focus on randomized, controlled trials (RCTs) sponsored by the pharmaceutical industry.
• Analysis of potential sources of bias and artifact in study design and interpretation.

Main Results:

• Industry-sponsored RCTs demonstrate modest specific efficacy for antidepressants compared to placebo.
• Identified biases and artifacts limit the validity and interpretability of these studies.
• Efficacy data from these trials are often influenced by study objectives, such as regulatory approval.

Conclusions:

• The specific efficacy of antidepressants in industry-sponsored trials is modest.
• Methodological limitations and biases in these studies compromise their value for evidence-based medicine.
• Current industry-sponsored research provides an inadequate foundation for assessing antidepressant effectiveness.