I need to know if Dexmethylphenidate which is a generic of XR Focalin?

Usual Adult Dose for Attention Deficit Disorder

Extended-release:

Patients currently not involved in treatment with dexmethylphenidate, racemic methylphenidate, or other stimulants:
Initial: 10 mg once a day (in the morning)
Maintenance: Dosage may be adjusted in 10 mg increments at approximately weekly intervals.
Maximum dose: 40 mg/day

Patients currently involved in treatment with methylphenidate:
Initial: one-half the total daily dose of racemic methylphenidate
Maximum dose: 40 mg/day

Patients currently taking dexmethylphenidate immediate-release:
Initial dose: dose equal to the daily dose of immediate-release administered once a day (in the morning).
Maximum dose: 40 mg/day

Usual Pediatric Dose for Attention Deficit Disorder

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Immediate-release:
6 to 18 years:
Patients not currently taking racemic methylphenidate or other stimulants:
Initial: 2.5 mg twice a day, with an interval of at least 4 hours between doses.
Maintenance: Dosage may be adjusted in 2.5 to 5 mg increments at approximately weekly intervals.
Maximum dose: 10 mg twice a day

Patients currently taking methylphenidate:
Initial: one-half the dose of racemic methylphenidate.
Maximum dose: 10 mg twice a day.

Extended-release:
6 to 18 years:
Patients not currently taking dexmethylphenidate, racemic methylphenidate, or other stimulants:
Initial: 5 mg once a day (in the morning)
Maintenance: Dosage may be adjusted in 5 mg increments at approximately weekly intervals.
Maximum dose: 30 mg per day

Patients currently taking methylphenidate:
Initial: one-half the dose of racemic methylphenidate.
Maximum dose: 30 mg per day

Patients currently taking dexmethylphenidate immediate-release:
Initial dose: dose equal to the daily dose of immediate-release administered once a day (in the morning).
Maximum dose: 30 mg per day

hope this helps!