Is Vyvanse a SSRI

No. Vyvanse is the brand name for lisexamfetamine which is a prodrug of amphetamine. Vyvanse is created in a way that it is not possible to inject or snort the drug to produce a high which makes it less abusable. Amphetamine works on norepinephrine and dopamine receptors, while SSRI's work on serotonin.