Ran out of adderall not gettin new script till tm, have left over vyvanse (lisdexamfetamine) from when i used to be prescribed before i switched, ok for me to take 1 day?

Onset & duration of : action differ, both usually longer than for Adderall XR. Approximately ? of a Vyvanse (lisdexamfetamine) dose is amphetamine, the active ingredient. If the Vyvanse (lisdexamfetamine) has not expired, adjusting the dose to match your Adderall XR up to a maximum of 70 mg of Vyvanse (lisdexamfetamine) if you take 25-30 mg. of Adderall XR should be okay. Keep amphetamines locked up to prevent diversion. Check you blood pressure & pulse rate monthly.

Depends on dose: Adderall is a mixture of amphetamine salts while Vyvanse (lisdexamfetamine) is just one component of Addersll. The general equivalence is 30 mg of Vyvanse (lisdexamfetamine) = 10 mg of Addersll, 50 mg Vyvanse (lisdexamfetamine) = 20 mg Addersll & 70 mg Vyvanse (lisdexamfetamine)= 30 mg of Adderall. If you were taking a dose of Vyvanse (lisdexamfetamine) equivalent to your Adderall you should be safe in the short run.