Gale - I don't believe there is a medication for the usual kind of balance problems in PD (has your Dad been checked for low blood pressure? esp the kind where bp drops when you stand up?). I have heard good things about Tai Chi improving balance for people with PD -- both from my PD instructor and from folks on this list! If your local hospital has exercise classes etc, check with them. There are videos, too -- check the archives. Mary cg for mom