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Long-term effects of extended-release mixed amphetamine salts treatment of attention- deficit/hyperactivity disorder
Stephen V Faraone1, Joseph Biederman, Michael Monuteaux
1Department of Psychiatry and Behavioral Sciences, SUNY Upstate Medical University, Syracuse, New York 13210, USA. faraones@upstate.edu
Objective:
The aim of this study was to examine the long-term effects of extended-release mixed amphetamine salts (MAS-XR) with 10-30-mg doses on the growth of children being treated for attention-deficit/hyperactivity disorder (ADHD).
Methods:
Long-term growth data were collected from 568 children, 6-12 years of age, enrolled in a multicenter, open-label study of the safety of MAS-XR for the treatment of ADHD symptoms over the course of 6-30 months.
Results:
Children taking MAS-XR grew less than expected, based on the norms provided by the Centers for Disease Control (CDC). The losses in expected weight and body mass index (BMI) were greatest for the heaviest children, and the losses in expected height were greatest for the tallest children. For weight, height, and BMI, we found that nearly all of the growth deficits occurred in year one. For each of these growth parameters, the loss in expected growth was not significant in the second year of treatment.
Conclusions:
Our results suggest that treatment with MAS-XR can lead to reductions in expected height and weight that are not fully rectified over the course of treatment, although they did show attenuation with treatment over time. Although this does not eliminate the need for clinicians to monitor growth, as they should for all stimulant formulations, it suggests that deficits in growth are not likely to be a clinical concern for most children treated with MAS-XR.
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Attention-Deficit/Hyperactivity Disorder
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings.