My Cardiologist switched me from Norvasc, a calcium channel blocker to Dynacirc CR in April starting with 5 mg two times a day. My blood pressure wasn't down as low as it should be so now I take 10 mg two times a day. Yesterday I worked out in my garden and felt that I don't even have Parkinsons. I also take Azilect, Requip, Amantadine for my PD.