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You're putting tremendous pressure on your CNS and your heart. You're likely to get sick or, in some cases, invoke a heart attack or fatally high blood pressure

Adderall xr will stay in your system for about 12 hours. It will greatly disrupt your ability to fall asleep and stay asleep if you take it after 12 noon. I suggest you get some instant release tablets for times you need to take it between 1 pm and 6 pm. Again, though, don't take it after 6 pm or so or you'll risk ruining the quality of your sleep.

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Q: I took 20 mg of adderall at 4pm last night and could not sleep all night and I now have to go to work and school so Can I take another 20mg now 9am to keep me up?
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