Stimulant medication use and response to growth hormone therapy: an NCGS database analysis.

Background/aims: Determine (1) frequency of attention-deficit hyperactivity disorder (ADHD) treatment and (2) growth responses in growth hormone (GH)-treated children who are receiving ADHD medication versus GH alone.

Methods: Prepubertal children with idiopathic short stature (ISS) or GH deficiency (IGHD) enrolled in Genentech's National Cooperative Growth Study. ADHD treatment was determined by documentation of psycho-stimulant medication use at enrollment.

Results: ADHD medication use increased from 0.8% (7/850) in 1985 to 5.8% (752/12,113) in 2005. First-year GH treatment response for ADHD + IGHD versus IGHD: 8.5 +/- 2.0 vs. 9.4 +/- 2.6 cm/year, but when adjusted for age, sex, and enrollment body mass index, the difference is clinically insignificant (-0.4 cm/year). First-year growth was similar in all ISS: 8.1 +/- 1.9 versus 8.6 +/- 2.1 cm/year (ADHD + ISS vs. ISS, an adjusted -0.2-cm/year difference).

Conclusion: Increasing numbers of GH-treated children are taking ADHD medications and their growth responses during the first year of GH therapy are similar to those not taking ADHD medications.