Rm4278; No Vyvanse does not need time to kick in but it may take a day or two for you to notice what it is doing. But it is not timed release or the type of medicine that takes time to get a blood level. most say give it a week to really notice even more so if you are switching from another medication in the same class. Good luck. Chuck1957
- Vyvanse Information for Consumers
- Vyvanse Information for Healthcare Professionals (includes dosage details)
- Side Effects of Vyvanse (detailed)
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