Parkinsons Disease. To 4. please advise.

Need your advise for my father , aged 70 who has been suffering from Parkinson since last 4 years. Below is the history of his disease and medications so far. May, 2012-His Left-hand palm started to shake. Aug, 2012-Showed up a neurologist in Bangalore and was advised below tablets. Syndopaplus-125 mg-Thrice daily Pacitane-2mg-Twice daily Rasalect-0.5 mg-1daily. Miraculously, Parkinson stopped completely after 7 days of taking above tablets in Aug 2012 till July 2014. But it came back again in Aug 2014. (June, 2013-Was advised to stop Pacitane tab and continue other two i.e Syndopa plus and Rasalect). Palm shaking is intermittent, there is no specific timing of the day as such. If he holds anything heavy in that hand, or steps out for groceries etc, his palm shakes more. Also if he is irritated or gets tensed, or angry, then it shakes heavily. No issues when he is in sleep. He is doing palm exercise as advised. Since June-2016- advised to increase syndopa plus to 4. Please advise.