Insights
Methylphenidate treatment for ADHD may slow growth in children, but final adult height is typically unaffected. Catch-up growth often occurs after stopping the medication.
Area of Science:
- Pediatrics
- Pharmacology
- Child Psychology
Background:
- Attention-deficit hyperactivity disorder (ADHD) is commonly treated with psychostimulants like methylphenidate.
- Concerns exist regarding the impact of these medications on childhood growth and development.
Purpose of the Study:
- To evaluate the effects of methylphenidate on height and weight changes in children with ADHD.
- To assess the long-term impact on final adult height and identify factors influencing growth retardation.
Main Methods:
- A randomized trial involving 521 hyperactive children.
- Longitudinal monitoring of height and weight over 3 years.
- Systematic reviews of existing literature on methylphenidate and growth.
Main Results:
- Methylphenidate treatment was associated with reduced annual height and weight gain (-1.23 cm/year and -2.48 kg/year).
- Growth slowed by approximately 1-1.5 cm per year, with catch-up growth observed after treatment cessation.
- No significant difference in final adult height was found compared to untreated individuals.
Conclusions:
- Methylphenidate can temporarily slow growth, likely due to appetite suppression.
- Final adult height is generally not affected by methylphenidate treatment.
- Regular growth monitoring during prescription renewals is crucial; dose adjustment or interruption may be needed for significant growth retardation.
Abstract:
Methylphenidate is an amphetamine psychostimulant used as a symptomatic treatment for attention-deficit hyperactivity disorder. A randomised trial examined changes in the height and weight of 521 hyperactive children. After 14 months, children treated with methylphenidate had gained less height and less weight (-1.23 cm per year and -2.48 kg per year) than untreated children. After 3 years, the differences were about 2 cm and 2.7 kg. Systematic reviews have provided similar results: methylphenidate slows growth by about 1 to 1.5 cm per year. Catch-up growth usually occurs during a 2-year period after methylphenidate withdrawal. Studies of final adult height have shown no statistically significant difference versus never-treated individuals. The effect of methylphenidate on growth is probably due to its impact in reducing appetite. Dexamfetamine is sometimes used as an alternative to methylphenidate and has similar effects on growth, as is the case with atomoxetine. In practice, prescription renewal provides a good opportunity to measure these children's growth. Marked growth retardation may warrant treatment interruption or a dose reduction.
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