Hello, My Father Is 67Y. He Has Parkinsons Disease For

Hello, My father is 67Y. He has Parkinsons disease for 10years. He's taking:

Codopa 275, half+half+half
Hexinor 5, half+0+half+0
Indever 10, 1+0+1
Amantrel 100, 1+0+1
Pase 1, 0+0+1

He's taking amantadine for 2Y, and after starting this medicine, he's lost around 10kg weight and very weak. But some of his side effects have reduced.

Also, now he's extensively Hallucinating days and nights. This is the main problem right now. Please suggest a solution.