Should My Father Start Taking Syndopa CR For Parkinson S Disease, Or Continue With His Current Dosage?

Hi , My father Is suffering from parkinsons and he is only 48 years now. He started to have symtoms Around 4 years ago. Now he has Trembling in left hand. He also experiences Trembling in right hand some times and in right leg rarely. Also he Has been taking syndopa Plus 3 times a day as of now with Ropark 2 mg once a day. He is advised to take Syndopa CR 125 once before Goind to Sleep. Should he start taking syndopa Cr125 or should he avoid taking it and Continue With his Dosage. In A long Run how to Control this Problem or is it in anyway possible to eradicate this Disease..?