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Ann Intern Med. 2006 Jul 18;145(2):81-90.

Effects of sibutramine treatment in obese adolescents: a randomized trial.

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  • 1The Behavioral Health Center, The Children's Hospital of Philadelphia and the University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA. berkowitz@email.chop.edu



Increased prevalence of adolescent obesity requires effective treatment options beyond behavior therapy.


To see whether sibutramine reduced weight more than placebo in obese adolescents who were receiving a behavior therapy program.


12-month, 3:1 randomized, double-blind trial conducted from July 2000 to February 2002.


33 U.S. outpatient clinics.


498 participants 12 to 16 years of age with a body mass index (BMI) that was at least 2 units more than the U.S. weighted mean of the 95th percentile based on age and sex, to the upper limit of 44 kg/m2.


Site-specific behavior therapy plus 10 mg of sibutramine or placebo. Blinded study medication dose was uptitrated to 15 mg or placebo at month 6 if initial BMI was not reduced by 10%.


Body mass index, waist circumference, body weight, fasting lipid and glycemic variables, safety, and tolerability.


Seventy-six percent of patients in the sibutramine group and 62% of patients in the placebo group completed the study. The estimated mean treatment group difference at month 12 (linear mixed-effects model) favored sibutramine for change from baseline in BMI (-2.9 kg/m2 [95% CI, -3.5 to -2.2 kg/m2]) and body weight (-8.4 kg [CI, -9.7 to -7.2 kg]) (P < 0.001 for both). The sibutramine group had greater improvements in triglyceride levels, high-density lipoprotein cholesterol levels, insulin levels, and insulin sensitivity (P < or = 0.001 for all). The rate of tachycardia was greater with sibutramine vs. placebo (12.5% vs. 6.2%; difference, 6.3 percentage points [CI, 1.0 to 11.7 percentage points]) but did not lead to increased withdrawal (2.4% vs. 1.5%; difference, 0.9 percentage point [CI, -1.7 to 3.5 percentage points]).


The 1-year study duration precluded assessment of long-term weight maintenance and putative health benefits and harms, and 24% and 38% of the sibutramine and placebo groups, respectively, did not complete follow-up.


Sibutramine added to a behavior therapy program reduced BMI and body weight more than placebo and improved the profile of several metabolic risk factors in obese adolescents.

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