Attention-deficit/hyperactivity disorder drugs and growth: an Italian prospective observational study
Elena A P Germinario1, Romano Arcieri, Maurizio Bonati
11 Department of Therapeutic Research and Medicines Evaluation, Istituto Superiore di Sanità , Rome, Italy .
Insights
Methylphenidate (MPH) and atomoxetine (ATX) for attention-deficit/hyperactivity disorder (ADHD) can negatively impact children's growth. Atomoxetine showed a more pronounced effect on height and weight compared to methylphenidate.
Area of Science:
- Pediatric pharmacology
- Child development
- Neuroscience
Background:
- Attention-deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder in children.
- Pharmacological treatments like methylphenidate (MPH) and atomoxetine (ATX) are widely used.
- Long-term effects of these medications on growth require careful monitoring.
Purpose of the Study:
- To evaluate the long-term impact of MPH and ATX on growth parameters in drug-naïve children with ADHD.
- To compare the growth effects between MPH and ATX treatments.
Main Methods:
- An observational, post-marketing, phase IV study design.
- Collection of height and weight data at baseline and every six months for up to 24 months.
- Analysis of growth using z-scores and Tanner's percentile.
Main Results:
- Both MPH and ATX were associated with decreased height gain (z-scores).
- The negative effect on height was significantly greater with ATX than MPH, particularly in the first year.
- While weight generally increased, a subset of patients on both drugs exhibited growth below expected levels, with a greater impact from ATX.
Conclusions:
- ADHD medications, specifically MPH and ATX, can exert a negative influence on linear growth in children over the mid-term.
- Atomoxetine demonstrates a more significant negative effect on growth compared to methylphenidate.
Objective:
This study was conducted to assess the long-term effect of methylphenidate (MPH) or atomoxetine (ATX) on growth in attention-deficit/hyperactivity disorder (ADHD) drug-naïve children.
Design:
The study was an observational, post-marketing, fourth phase study.
Methods:
Data on height and weight were collected at baseline and every 6 months up to 24 months.
Results:
Both ATX and MPH lead to decreased height gain (assessed by means of z-scores); the effect was significantly higher for ATX than for MPH. At any time, height z-score decrease in the ATX group was higher than the corresponding decrease observed in the MPH group, but the difference was significantly relevant only during the first year of treatment. An increment of average weight was observed both in patients treated with MPH and in those treated with ATX. However, using Tanner's percentile, a subset of patients showed a degree of growth lower than expected. This negative effect was significantly higher for ATX than for MPH.
Conclusions:
We conclude that ADHD drugs show a negative effect on linear growth in children in middle term. Such effect appears more evident for ATX than for MPH.
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