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How effective is lithium in the prevention of relapse in bipolar disorder? A prospective naturalistic follow-up study
T Silverstone1, H McPherson, N Hunt
1Department of Psychological Medicine, Dunedin School of Medicine, University of Otago, New Zealand.
Objective:
The effectiveness of lithium in preventing recurrences of bipolar disorder was examined prospectively for 2 years in two representative samples of bipolar I patients being treated in a comprehensive program following recommended guidelines.
Method:
One hundred and twenty patients were recruited from consecutive admissions to two catchment area psychiatric services (one in the United Kingdom, the other in New Zealand). They were seen at 3-monthly intervals by a member of the research team. Treatment was adjusted according to clinical needs.
Results:
Overall, two-thirds of the patients had a recurrence. Of the 57 on lithium as sole treatment, 39 (68%) had a further episode; 17 after stopping lithium. The 42 on other mood stabilisers and/or an antipsychotic, with or without lithium, did no better. By contrast, only eight (38%) of the 21 who were taking no prophylactic medication had a recurrence.
Conclusions:
Lithium is much less effective in clinical practice than would be expected from clinical trial results. A major reason for this is poor compliance. Alternative treatment strategies are needed to improve the outcome for bipolar disorder patients.