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Journal of Obesity
Volume 2016 (2016), Article ID 7852648, 7 pages
Clinical Study

The Effect of Eighteen-Month Metformin Treatment in Obese Adolescents: Comparison of Results Obtained in Daily Practice with Results from a Clinical Trial

1Department of Pediatrics, St. Antonius Hospital, Nieuwegein/Utrecht, P.O. Box 2500, 3430 EM Nieuwegein, Netherlands
2Department of Clinical Pharmacy, St. Antonius Hospital, Nieuwegein/Utrecht, P.O. Box 2500, 3430 EM Nieuwegein, Netherlands
3Division of Pharmacoepidemiology and Clinical Pharmacology, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, Netherlands

Received 31 August 2016; Accepted 30 November 2016

Academic Editor: Till Hasenberg

Copyright © 2016 Marloes P. van der Aa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. In a recent randomized controlled trial (RCT) in obese adolescents, 18 month-treatment with metformin versus placebo was reported to lead to stabilisation of the BMI. This study aimed to compare the effect of metformin on BMI in obese adolescents in daily practice versus results obtained in an RCT. Methods. Obese adolescents treated off label with metformin in daily practice in an outpatient clinic with a follow-up of ≥18 months were identified. Anthropometric and biochemical data were collected at baseline and at 18 months. Patients treated with metformin for 18 months in an RCT were used for comparison. BMI was compared between the two groups. Results. Nineteen patients (median age 14.3 (interquartile range 11.7–15.7) years, BMI 31.3 (28.8–33.8) kg/m2) treated in daily practice were compared to 23 patients receiving metformin in the RCT (age 13.6 (12.6–15.3) years, BMI 29.8 (28.1–34.5) kg/m2). BMI change after 18 months was −0.36 (−2.10–1.58) versus +0.22 (−2.87–1.27) kg/m2 for the two groups, respectively. In the multivariable model, BMI change was not statistically significantly different between the two groups (). Conclusion. Treatment with metformin in obese adolescents in daily practice resulted in a comparable change in BMI as observed in an RCT. This trial is registered with number: NCT01487993.