What Are The Effects Of Focalin And Pristiq?

I am eighteen and have been taking 20 mg of Focalin xr for ADHD. I used to take medicine for Social Anxiety Disorder. Recently i started taking some of my Pristiq to deal with the symptoms of Anxiety that i just can't handle. How will either the Focalin or the Pristiq effect my body physically and mentally in the short and long term? Also, how might the two drugs interact with one another?