Hi I have severe PTSD and was recently prescribed vyvanse, interestingly enough, it has seriously helped me. I do not get the shakes cravings etc, just normal. I am also taking Klonopin and prazosin. I have been sober for many years and no SSRI has worked..I am in therapy etc...For some reason, I need 300mg of vyvanse and it's weird because that is obviously considered a high dose, however it works for me. I am not abusing it but finally after 30 years feel that the combo is helping Why is it a problem then? I have taken SSSRi's that have had terrible noticeable effects but not this...can't it just be my body responding