A really dry mouth too.
I used to take Procyclidine for antipsychotic induced akathesia, and it gave me dry mouth too.I am going to try a magnesium supplement for my RLS to see if that helps.
I googled some of the side effects when you mentioned it previously and saw that dry mouth was one of them. It's a bit annoying but it's not the worst side effect in the world I guess.
My hygienist told me to make special sure to hydrate myself because so many of my meds make the mouth dry.