Influence of topiramate on olanzapine-related weight gain in women: an 18-month follow-up observation.
Author(s): Egger C, Muehlbacher M, Schatz M, Nickel M
Affiliation(s): Universitatsklinik fur Psychiatrie und Psychotherapie, PMU, Salzburg, Austria. email@example.com
Publication date & source: 2007-10, J Clin Psychopharmacol., 27(5):475-8.
In a randomized controlled trial, we compared the efficacy of topiramate versus placebo in women undergoing olanzapine therapy and found that topiramate effectively contributed to weight loss in short-term treatment and had a positive effect on health-related quality of life, the patients' actual state of health, and psychological impairments. The aim of this observational study was to assess whether topiramate has a sustained benefit in long-term treatment of olanzapine-associated weight gain in subjects who had participated in the previous randomized controlled trial comparing topiramate with placebo. The subjects (topiramate group, n = 25; former placebo group, n = 18) were observed in an 18-month open-label study. After unblinding, subjects from the former topiramate group continued treatment with topiramate, whereas subjects from the former placebo group received neither placebo nor topiramate.The subjects were seen every 6 months, weighed, and tested with the SF-36 Health Survey, Scale of Well-Being, and the Adjective Checklist. According to the intent-to-treat principle, the repeated-measures analysis showed a significant interaction for the group-by-time effect for change of weight (P < 0.01) on the Scale of Well-Being (P < 0.01), all scales of the Adjective Checkist (all P < 0.01), and 5 scales (physical functioning, role limitations due to physical health, social functioning, mental health, and vitality) of the SF-36 Health Survey (all P < 0.01). Topiramate was well tolerated and seems to be effective and safe in the long-term treatment of olanzapine-related adiposity in women. Furthermore, positive changes in the patients' state of health, psychological impairments, and health-related quality of life could be also observed.