I am concerned about taking this medication but heard it may help when stimulants are not available/workable.

My concerns have to do with efficacy (does it actually work to reduce ADD symptoms and which ones?) and heart rate issues (I have average heart rate already).

My other worry is withdrawal. I think Guanfacine has less withdrawal, but is not available where I live. I also think that the sleepiness action may be good for my insomnia, but I think that this effect wears off. Does it?

Thanks.