Vyvanse (lisdexamfetamine) is a form of: Long-acting dextroamphetamine. Amphetamines show up in drug testing for 48 hours after administration but may vary depending on the sensitivity of the lab test and the metabolism of the individual. Take vyvanse (lisdexamfetamine) only as prescribed and be able to produce your valid prescription if questioned. Best regards.
Answered 10/24/2013
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