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A member asked:

Is vyvanse (lisdexamfetamine) effected by urine alkalinity?

A doctor has provided 1 answer
Dr. Edward Kuhnley answered

Specializes in Child Psychiatry

Excretion is: The percent of dose excreted as unchanged drug varies greatly depending upon urinary ph and urine flow. At low ph as much as 70% of the dose may be excreted as amphetamine in 24 h, whereas as little as 1% may be excreted within 24 h at alkaline ph (j. Pharm. Pharmacol. 21:241-258 (1969).

Answered 12/9/2013

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Related Questions

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Could you dissolve Vyvanse (lisdexamfetamine) into clean urine to make it test positive?

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Can you tell me about Vyvanse (lisdexamfetamine) and the duration it is detectable in your urine?

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I took 70mg Vyvanse (lisdexamfetamine) for approximately 2 weeks. How long before it's out of my urine?

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I rarely take vyvanse (lisdexamfetamine). I know it's bad even if i'm not prescribed. However i just took one. Should it be totally out of my urine in 48 hours or less?

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How long do you need to be off Vyvanse (lisdexamfetamine) so it will not show up in a urine drug screen?

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