BMJ 1996;313:253-258 (3 August)
Papers
St John's wort for depression--an overview and meta-analysis of randomised clinical trials
Klaus Linde,
scientific assistant,a
Gilbert Ramirez,
codirector,b
Cynthia D Mulrow,
professor of medicine,b
Andrej Pauls,
consultant psychiatrist,c
Wolfgang Weidenhammer,
biostatistician,a
Dieter Melchart,
project leader aa Projekt "Munchener Modell," Ludwig-Maximilians-Universitat, Kaiserstrasse 9, 80801 Munich, Germany,
b San Antonio Cochrane Center, Audie L Murphy Memorial Veterans Hospital, San Antonio, TX 78284, USA,
c Private Practice for Neurology and Psychiatry, 80796 Munich
Correspondence to: Dr Linde.
Abstract
Objective: To investigate if extracts of Hypericum perforatum (St John's wort) are more effective than placebo in the treatment of depression, are as effective as standard antidepressive treatment, and have fewer side effects than standard antidepressant drugs.
Design: Systematic review and meta-analysis of trials revealed by searches.
Trials: 23 randomised trials including a total of 1757 outpatients with mainly mild or moderately severe depressive disorders: 15 (14 testing single preparations and one a combination with other plant extracts) were placebo controlled, and eight (six testing single preparations and two combinations) compared hypericum with another drug treatment.
Main outcome measures: A pooled estimate of the responder rate ratio (responder rate in treatment group/responder rate in control group), and numbers of patients reporting and dropping out for side effects.
Results: Hypericum extracts were significantly superior to placebo (ratio = 2.67; 95% confidence interval 1.78 to 4.01) and similarly effective as standard antidepressants (single preparations 1.10; 0.93 to 1.31, combinations 1.52; 0.78 to 2.94). There were two (0.8%) drop outs for side effects with hypericum and seven (3.0%) with standard antidepressant drugs. Side effects occurred in 50 (19.8%) patients on hypericum and 84 (52.8%) patients on standard antidepressants.
Conclusion: There is evidence that extracts of hypericum are more effective than placebo for the treatment of mild to moderately severe depressive disorders. Further studies comparing extracts with standard antidepressants in well defined groups of patients and comparing different extracts and doses are needed.
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Key messages
- There is evidence from randomised trials that such extracts are more effective than placebo for the treatment of depressive disorders, but it is not known whether they are more effective for certain disorders than others
- Current evidence is inadequate to establish whether hypericum is as effective as other antidepressants and if it has fewer side effects
- Additional trials should be conducted to compare hypericum with other antidepressants in well defined groups of patients; to investigate long term side effects; and to evaluate the relative efficacy of different preparations and doses
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