However, there is a high relapse rate associated with current therapies.

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In siblings, the relapse rate is only 15%.

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Newer studies have suggested that they are no more effective than placebo or talk therapy, while others have found that the rate of relapse is higher for antidepressants than for placebo.

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The result was that three-quarters of the treated group did not relapse into depression: a success rate twice as high as that of the 20 patients in the control group, who received a placebo regimen.

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In those who did relapse, follow-up treatment led to a 99.5% survival rate.

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