Dexmethylphenidate to Methylphenidate Conversion

Recommended Dosing Schedule

• The American Academy of Child and Adolescent Psychiatry recommends administering methylphenidate IR 20-30mg three times daily (morning, noon, and 4 PM) to approximate the coverage provided by dexmethylphenidate ER twice daily 1
• The morning dose should be 25-30mg, the noon dose should be 25-30mg, and the afternoon dose should be 20-25mg, with a total daily dose of 70-85mg, titrated to the patient's response within the 80mg target 1

Critical Considerations

• Methylphenidate IR provides only 4-6 hours of action per dose, requiring 3-4 doses to achieve similar daily coverage, compared to dexmethylphenidate ER which provides 8-12 hours of coverage per dose 1, 2
• The patient will experience more pronounced peaks and troughs with IR formulation compared to the smoother plasma concentration curve of ER, and is at increased risk of rebound effects, including behavioral deterioration in late afternoon 2

Alternative Recommendations

• Consider converting to methylphenidate ER formulations instead of IR to maintain the pharmacokinetic advantages of extended-release dosing, but if conversion to IR is necessary, use the 80mg/day total dose calculated above and implement a three-times-daily schedule (morning, noon, 4 PM) 1, 2