St John's wort for depression

Area of Science:

• Pharmacology
• Psychiatry
• Evidence-based Medicine

Background:

• Hypericum perforatum L. (St. John's wort) has a long history in folk medicine for treating depressive disorders.
• Scientific investigation is needed to validate its efficacy and safety compared to conventional treatments.

Purpose of the Study:

• To evaluate the effectiveness of St. John's wort extracts against placebo and standard antidepressants for adult depression.
• To assess the safety profile of St. John's wort, specifically adverse effects compared to standard antidepressants.

Main Methods:

• Systematic review of randomized, double-blind trials comparing St. John's wort with placebo or standard antidepressants.
• Inclusion criteria focused on depressive disorders and clinical outcome measures like symptom scales.
• Responder rate ratio and dropout rates due to adverse effects were key outcome measures.

Main Results:

• 37 trials were analyzed, with 26 placebo comparisons and 14 comparisons against standard antidepressants.
• Placebo-controlled trials showed heterogeneity; St. John's wort demonstrated potential benefits, especially in non-major depression.
• Compared to SSRIs and tricyclic antidepressants, St. John's wort showed similar effectiveness with fewer dropouts due to adverse effects.

Conclusions:

• Evidence on St. John's wort for depression is inconsistent and requires careful interpretation.
• Recent placebo-controlled trials suggest minimal benefits for major depression, while others indicate efficacy similar to standard antidepressants.
• Pharmaceutical quality variations in St. John's wort products may explain inconsistent findings; results apply only to tested products.