How long will taking two 40mg capsules of focalin (dexmethylphenidate) xr laugh if they are taken within 4 hours?

No joke: No extra benefit found in studies when using such a high dose compared to the maximum fda approved limit (much less than 80 mg/d). But risks multiply and side effects become more common and dangerous. Only take such dose if clearly prescribed to you by your dr. 1/2 life usually ranges 2 to 4.5 hours, heavy, prolonged daily use may change this, effects may last a bit longer in xr.

Focalin (dexmethylphenidate) XR lasts: 6 to 12 hours depending on the individual and their metabolism. The recommended maximum is 40 mg per day but dosing is very individual and needs to be determined with your prescriber. If two doses are necessary then the second dose should be scheduled to be given 30 minutes before the first dose wears off and symptoms return. Best regards.