Hey there! It's so crazy that right here, at little old Bluelight, we can count THE Christina Aguilera as a member. I loved your work in Mulan. "Reflection" nearly brought me to tears and "You're Beautiful" has been my anthem for years. Being a freakishly ugly and morbidly obese troll, your message was well-received and sincerely appreciated. I'm assuming that the Amphetamine abuse is why you've been absent from the scene for a while?
Anyhow, let's get down to brass tacks. Lisdexamphetamine (Vyvanse) is not injectable. It was designed for the very purpose of discouraging abuse. The active constituent of this drug, the Dextroamphetamine is coupled with a protein that must be metabolized in the intestines for it to become active. If taken by any other route, it will not become active. The only option is oral administration.