Elvanse, which is lisdexamphetamine, is sold under the Vyvanse brand in the US. It is a prodrug for one of the isomers found in adderall. This just means that you take elvanse, which is initially sort of ‘inactive’ and your body eventually converts it into what can essentially be thought of as adderall, or more accurately, d-amphetamine. Adderall specifically also contains l-amphetamine which is absent from this drug, the l-amphetamine isomer is responsible for more of the unwanted nervous system / cardiac effects.