3 doctors weighed in:
How many hours does it take before ADHD medication starts working after you take it?
3 doctors weighed in

Dr. Carla Enriquez
Pediatrics
1 doctor agrees
In brief: Varies
Effectiveness (onset to action) can be 15-20 minutes in short acting stimulants (methylphenidate, amphetamine, dexedrine), 1-1/2 hrs in long acting stimulants (daytrana, vyvanse), days to weeks in Alpha 2 adrenergic drugs (intuniv, clonidine), and weeks to months with atypical antidepressants (desipramine, atomoxetine).

In brief: Varies
Effectiveness (onset to action) can be 15-20 minutes in short acting stimulants (methylphenidate, amphetamine, dexedrine), 1-1/2 hrs in long acting stimulants (daytrana, vyvanse), days to weeks in Alpha 2 adrenergic drugs (intuniv, clonidine), and weeks to months with atypical antidepressants (desipramine, atomoxetine).
Dr. Carla Enriquez
Dr. Carla Enriquez
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In brief: Depends
Depends on the medication, and on the person taking the medication.
Some medication "work" within 45 min. Other medications can take up to a few weeks to "work.".

In brief: Depends
Depends on the medication, and on the person taking the medication.
Some medication "work" within 45 min. Other medications can take up to a few weeks to "work.".
Dr. Bartholomew Vereb
Dr. Bartholomew Vereb
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