Description Although Vyvanse is referred to as “pro-drug” of dextroamphetamine, it is still an amphetamine, meaning that it is easily abused and can cause insomnia, agitation, anxiety and sometimes psychotic symptoms like seeing things or becoming paranoid. The difference between Vyvanse and Adderall is that Vyvanse will work only if it is swallowed so that drug abusers will not be able to snort or inject it. It is hoped this will limit abuse of Vyvanse. A 30 mg Vyvanse capsule is molecularly equivalent to 8.88 mg dextroamphetamine. Used For Attention deficit disorder How Amphetamines Work