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Review: discontinuation rates are the same for serotonin specific reuptake inhibitors and newer tricyclic and heterocyclic antidepressants
  1. Joanna Moncrieff, BMedSci, MBBS
  1. Institute of Psychiatry, London, UK

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Objective

To determine if the advantage in discontinuation rates of serotonin specific reuptake inhibitors (SSRIs) shown in previous reviews was present when compared with newer tricyclic or heterocyclic antidepressants for the treatment of depression.

Data sources

As part of an ongoing Cochrane Collaboration review, randomised controlled trials were identified by searching Medline for previous reviews that compared SSRIs (fluoxetine, sertraline, paroxetine, and fluvoxamine) with tricyclics and heterocyclics. Additional studies were identified by hand searching 2 journals. If data for discontinuation rates were not complete, the first author was contacted.

Study selection

Trials were selected if they compared tricyclics or heterocyclics with SSRIs for the treatment of depression. Studies of these compounds for other indications were excluded.

Data extraction

Data were extracted on discontinuation rates, type of SSRI used, type of tricyclic or heterocyclic used, patient numbers, and whether the treated patients were ⩾60 to 70 years of age.

Main resultsKeywords: Keywords please

Tricyclics and heterocyclics were classified into 1 of 3 groups: reference compounds (imipramine and amitriptyline); newer tricyclics (dothiepin, nortriptyline, desipramine, clomipramine, and doxepin); and heterocyclics (bupropion, mianserin, trazodone, maprotiline, amineptine, and nomifensine). Discontinuation rates were lower for SSRIs compared with tricyclics and heterocyclics combined {p<0.01}* and compared with reference compounds {p<0.05}* (table). No differences in discontinuation rates were found when SSRls were compared with either newer tricyclics (odds ratio [OR] 0.89, 95% CI 0.74 to 1.06) or heterocyclics (OR 1.02, CI 0.78 to 1.35).

Serotonin specific reuptake inhibitors (SSRIs) v tricyclics and heterocyclics combined and reference drugs†

Conclusions

Rates of discontinuation are the same for SSRIs and newer tricyclic and heterocyclic antidepressants. The advantage of SSRIs shown in previous reviews is caused by the use of old tricyclics as reference compounds.

Commentary

The review by Hotopf et al is consistent with previous reviews that show that the dropout rate from treatment for depression with SSRIs, which is itself quite substantial at around 30%, is only slightly lower than the dropout rate with tricyclic antidepressants.13 The relevance of the finding that this difference disappears when SSRIs are compared with “newer” tricyclics or heterocyclics is less clear. The distinction made between older and newer tricyclics is not well established, and other reviews categorise these drugs differently.2, 4 Evidence from general practice that tricyclics, with the exception of lofepramine, continue to be prescribed in “subtherapeutic” doses in most cases seems to suggest that these drugs are not well tolerated at recommended antidepressant doses.5 Further investigation is needed into the efficacy of low dose treatment with tricyclics because there is currently inadequate evidence about this issue.

Because tricyclics and SSRIs seem to be equally effective, the decision about which to use depends on balancing issues of tolerability, toxicity, and cost.3, 4 SSRIs are clearly less dangerous in overdose, although the tricyclic lofepramine has a similar advantage. Cost favours tricyclics. The issue of side effects depends on each patient's situation and symptoms. However, discussion of the relative value of these 2 classes of antidepressants should not obscure the fact that drug treatment, especially in general practice, is not necessarily always appropriate or sufficient.

References

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Footnotes

  • Source of funding: Medical Research Council Clinical Training Fellowship.

  • For article reprint: Dr M Hotopf, Department of Psychological Medicine, King's College School of Medicine and Dentistry and Institute of Psychiatry, 103 Denmark Hill, London SE5 8AZ, UK.

  • Abstract and commentary also published in Evidence-Based Medicine 1997 Sep-Oct; 2 :149.

  • * p values calculated from data in article.

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