My father has had diabetes for last 10 yrs and had developed Parkinsons 3-4 yrs back. he has had shaking in his hands and more importantly staunch constipation . He had been taking stimulant laxatives for quite some time.Because of it he developed severe intestinal obstruction last month and had to be hospitalized. Now he has to take laxatives everyday to keep motions going. He has been taking Syndopa 125mg (increased from 110mg) 3 times a day and Parkin 2mg. Offlate has has become a bit cynical and expression less. He is weak and can not do his daily chores himself and needs to be taken to the toilet. He also complains of dizziness . He also suffers from depression and self cursing and talks very less. What medication should be good for him? He is 72 yrs old.