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Published on: January 22, 2016
Methylphenidate dosing: twice daily versus three times daily
M A Stein1, T A Blondis, E R Schnitzler
1Department of Psychiatry, University of Chicago, Illinois, USA.
Thrice-daily dosing of methylphenidate hydrochloride (MPH) appears optimal for many children with attention deficit hyperactivity disorder (ADHD), showing greater efficacy than twice-daily dosing with minimal differences in side effects.
Area of Science:
- Pharmacology
- Neuroscience
- Child Psychiatry
Background:
- Attention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental disorder.
- Methylphenidate hydrochloride (MPH) is a widely prescribed stimulant medication for ADHD.
- Optimizing MPH dosing schedules is crucial for maximizing therapeutic benefits and minimizing adverse effects.
Purpose of the Study:
- To compare the short-term efficacy of twice-daily (b.i.d.) versus thrice-daily (t.i.d.) methylphenidate hydrochloride (MPH) dosing in children with ADHD.
- To evaluate the side effect profiles associated with different MPH dosing frequencies.
Main Methods:
- A 5-week, triple-blind, placebo-controlled, crossover study involving 25 boys with ADHD.
- Evaluated placebo, titration, b.i.d., and t.i.d. MPH dosing conditions.
- Utilized parent/teacher ratings, parent-child conflict measures, side effect reports, mood assessments, sleep logs, and actigraphy.
Main Results:
- All MPH dosing conditions improved ADHD symptoms compared to baseline.
- Thrice-daily (t.i.d.) dosing demonstrated the most significant improvements across behavioral measures.
- Appetite suppression was more common with t.i.d. dosing, but overall side effect profiles showed few significant differences between b.i.d. and t.i.d. schedules.
Conclusions:
- Thrice-daily (t.i.d.) MPH dosing may be optimal for managing ADHD symptoms in many children.
- Acute side effects are comparable between twice-daily (b.i.d.) and t.i.d. MPH dosing.
- Dosing schedules should be tailored to symptom severity and duration, not solely based on anticipated side effects.
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