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A member asked:
I took a vyvanse (lisdexamfetamine) dose at 10:15am this morning and it was 40mg how long will it last and when should i be able to fall asleep?
A doctor has provided 1 answer
Vyvanse (lisdexamfetamine): It is long-acting & can last up to 12 hours.
Answered 2/15/2013
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