I'd be very very very very very very cautious about that. It depends on when you workout, your stim tolerance, and some timing issues.
IF you workout in the morning, and IF you have a decent tolerance, and IF you dose during a small window before SX is fully active, you will probably get away with it. For example, if you wake at 7, dose SX at 7:15, take your pre-w/o at 7:45 and hit the gym at 8:00, you should be good to go. But if you do all that and workout in the afternoon when SX is at full strength, you should plan on catching Conan that night or seeing what's good for reruns on the Discovery Channel. (Can you tell I've done this before?!?)
