BMJ. 2007 Dec 8;335(7631):1194-9.
Long term pharmacotherapy for obesity and overweight: updated
meta-analysis.
Rucker D, Padwal R, Li SK, Curioni C, Lau DC.
Department of Medicine, University of Alberta, Edmonton, AB,
Canada.
Objectives:
To summarise the long term efficacy of anti-obesity
drugs in reducing weight and improving health status.
Design:
Updated meta-analysis of randomised trials.
Data Sources:
Medline, Embase, the Cochrane controlled trials register, the
Current Science meta-register of controlled trials, and
reference lists of identified articles. All data sources were
searched from December 2002 (end date of last search) to
December 2006. STUDIES REVIEWED: Double blind randomised placebo
controlled trials of approved anti-obesity drugs used in adults
(age over 18) for one year or longer.
Results:
30 trials of one
to four years' duration met the inclusion criteria: 16 orlistat
(n=10 631 participants), 10 sibutramine (n=2623), and four
rimonabant (n=6365). Of these, 14 trials were new and 16 had
previously been identified. Attrition rates averaged 30-40%.
Compared with placebo, orlistat reduced weight by 2.9 kg (95%
confidence interval 2.5 kg to 3.2 kg), sibutramine by 4.2 kg
(3.6 kg to 4.7 kg), and rimonabant by 4.7 kg (4.1 kg to 5.3 kg).
Patients receiving active drug treatment were significantly more
likely to achieve 5% and 10% weight loss thresholds. Orlistat
reduced the incidence of diabetes and improved concentrations of
total cholesterol and low density lipoprotein cholesterol, blood
pressure, and glycaemic control in patients with diabetes but
increased rates of gastrointestinal side effects and slightly
lowered concentrations of high density lipoprotein. Sibutramine
lowered concentrations of high density lipoprotein cholesterol
and triglycerides but raised blood pressure and pulse rate.
Rimonabant improved concentrations of high density lipoprotein
cholesterol and triglycerides, blood pressure, and glycaemic
control in patients with diabetes but increased the risk of mood
disorders.
Conclusions:
Orlistat, sibutramine, and rimonabant
modestly reduce weight, have differing effects on cardiovascular
risk profiles, and have specific adverse effects.

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