It is efficacious at doses of 30 to 70 mg daily in both children and adults. Its effects last for 13 hours in children and 14 hours in adults, and its safety and tolerability profile is similar to that of other stimulant medications.
How long does Vyvanse take to work? Vyvanse starts working within 1 hour after you take a dose. But you may need to take the drug for a few weeks before you start noticing an improvement in your condition.