... insomnia and a terribly racing heartrate) ... any how the doc did start me out on this one, twice a day ... but at the same time an ortho doc started me on Mobic and I wasn't sure which was giving me stomach pain, so I stopped both and the doc suggested using the once a day XL version ... now to the question: Can a person take one dose of the SR instead of the usual twice a day and have enough of this medicine to help with hypervigilance issues? That's what I have ... lol ... Thanks!