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QUESTIONS: In patients with bulimia nervosa (BN), are antidepressants as effective as psychological treatment (PT) for increasing remission and clinical improvement rates? Is a combination of antidepressants and PT better than each intervention alone?
Studies were identified by searching Medline; EMBASE/Excerpta Medica; LILACS; PsychLIT; SCISEARCH; the Cochrane Depression, Anxiety, and Neurosis Group Database of Trials; the Cochrane Controlled Trials Register; Clinical Evidence; and reference lists; by hand searching the International Journal of Eating Disorders and book chapters on BN; and by contacting authors and pharmaceutical companies.
Studies were selected if they were randomised controlled trials (RCTs) that compared antidepressants with PT in patients with BN. Studies were excluded if patients had binge eating or purging type anorexia nervosa or binge eating disorder.
2 reviewers assessed the quality of studies and extracted data on patients, study characteristics, interventions, and outcomes (including remission [100% reduction in binge or purge episodes], clinical improvement [≥50% reduction in binge or purge episodes], and dropouts).
5 RCTs (237 patients) compared antidepressants with PT. Groups did not differ significantly for remission (5 RCTs); only 1 RCT reported on clinical improvement. More dropouts occurred in the antidepressant group than in the PT group (4 RCTs) (table). 5 RCTs (247 patients) compared combination and single interventions.
Antidepressants v combination:
more patients in the combination group than in the antidepressant alone group had remission (4 RCTs) (table); only 1 RCT reported on clinical improvement. Groups did not differ for dropout rates (4 RCTs).
PT v combination:
more patients in the combination group than in the PT alone group had remission (6 RCTs); fewer patients in the PT alone group than in the combination group dropped out (6 RCTs) (table). Groups did not differ for clinical improvement (2 RCTs) (table).
In patients with bulimia nervosa, psychological treatment (PT) and antidepressants do not differ in remission rates but dropout rates are lower with PT. A combination of antidepressants and PT is best for increasing remission.
The reviews by Bacaltchuk et al are laudable for the rigour of the data analyses, but they rightly generate more questions than answers. Firstly, Bacaltchuk and Hay have comprehensively reviewed 16 published RCTs of antidepressant treatments for bulimia nervosa (BN). Although modest effectiveness is shown, high dropout rates among patients limit the clinical application of these data, and the authors comment on the need for more studies of tolerability and cost effectiveness. The studies included were generally of short duration in young adult women who did not have any substantial psychiatric comorbidity. The results cannot therefore be generalised to the substantial minority of bulimic patients with comorbid “multi-impulsive” personality characteristics,1 to patients with substance misuse, or to adolescents.
Pharmacological treatment trials of BN are dominated by the reported reduction in bulimic symptoms, but clinicians and their patients are more interested in remission of symptoms. The emphasis of this review on remission is therefore of greater clinical application than the emphasis of its sources. The review discusses the limitations of outcome measures and is right to conclude that the use of antidepressants as sole therapy “does not seem sufficient to effectively treat these patients”.
Secondly, Bacaltchuk et al review a scant number of studies comparing combined antidepressant medication and psychotherapy with each treatment alone. In clinical practice, cognitive behavioural therapy (CBT) is generally regarded as the treatment of choice for BN, which is limited by its availability, with antidepressant medication as an adjunct. This review supports that approach with restricted data from fairly small studies. However, the clinical risk associated with a pharmacological approach to BN seems to be a higher dropout rate than CBT, and again the results cannot necessarily be generalised beyond young adult women without substantial comorbidity.
The UK Department of Health′s National Service Framework for Mental Health has stressed the importance of managing such eating disorders as BN in primary care,2 noting that “antidepressants can reduce purging and bingeing whether or not the person is also depressed”. Although true in the short term, this would seem an optimistic reading of the literature. Prescription of antidepressants may appear to be the easiest route in a primary care setting. The clinical implication of the review by Bacaltchuk et al is that the easiest route may not be the most effective, cost effective, or acceptable for clinicians and their patients.
However, in the busy world of primary care, the treatment of BN will continue to be driven by available resources. Where specialists with training in CBT for BN are available, then that route is generally preferred by the family doctor. But the Royal College of Psychiatrists, in collaboration with the Consumers′ Association, has recently reported the dearth of specialist eating disorder services beyond southeast England.3 Thus in the more likely scenario of limited eating disorder services, use of antidepressant medication may seem more attractive. These 2 reviews agree with that approach and suggest that antidepressant medication will produce short term results. BN, however, is not a short term illness. Relapse prevention deserves greater scrutiny for patients with BN and anorexia nervosa, and longer term follow up studies should drive the next generation of treatment intervention studies.
Regarding treatment of BN in particular, a pressing need exists for longer term studies examining relapse rates, health economics, and comparisons of classes of antidepressants for treatment concordance.
Source of funding: not stated
For correspondence: Dr J Bacaltchuk, Universidade Federal de São Paulo, São Paulo, Brazil.
Abstract and commentary also appear in Evidence-Based Medicine.
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