What is the conversion ratio for adjusting methylphenidate preparations in pediatric attention deficit hyperactivity disorder (ADHD)?

Updated: Sep 09, 2021
  • Author: Maggie A Wilkes, MD; Chief Editor: Caroly Pataki, MD  more...
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For methylphenidate LA, CD, or ER preparations, convert by using a ratio of 2:1 with immediate-release methylphenidate. For example, Ritalin 10 mg q4h is converted to Ritalin LA 20 mg q8h. For a few patients, effects last only 5-6 hours with the LA preparations, although effects last 3.5-4 hours with the IR form. However, a short effect from one 8-hour preparation does not always mean another 8-hour preparation has the same problem.

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