If i take vyvanse (lisdexamfetamine) will i get a rash?

Possibly: Skin rashes are a very common adverse reaction, but the risk of it is no reason not to try a medication your doctor thinks can help you.

Very rare: The stimulant class of medication (such as Vyvanse (lisdexamfetamine) or adderall) are rarely associated with skin eruptions, allergic or otherwise. If you have a rash and are taking vyvanse, (lisdexamfetamine) most likely it isn't caused by the medication. See your prescribing doctor if the rash looks like this one, or continues.

Unusal: Getting a rash with Vyvanse (lisdexamfetamine) is not a common side effect. You should have your doctor evaluate this rash

Very uncommon: Rash is uncommon. If you have taken an amphetamine before and had a rash, you might have one on Vyvanse, (lisdexamfetamine) but otherwise not much of a worry.