Stimulants, Defecation, and the Autonomic Nervous system Question
So right now I am in an A&P class. I learned about the sympathetic and parasympathetic systems. I am a little bit confused though with Vyvanse (lisdexamfetamine). As we all know Vyvanse is a stimulant so it helps release more norepinephrine and dopamine. Both of these hormones are mainly used in the sympathetic system which is in charge of "fight or flight" whereas the parasympathetic system is in charge of "rest and digest". Because of dual innervation the digestive system should be most active when when the parasympathetic system is most active then slow down when the sympathetic system is most active. Now here is my main question.
If Vyvanse activates the sympathetic system why does it make you need to poop? Google says its because gut mobility is increased but shouldn't that be more on the sympathetic system? I do not think it is cooperative dual innervation either since pooping is a voluntary action (most of the time). Can someone explain how this works to me?