My father is diabetic and having problem in walking etc. He is having parkinson's diasease treatment as well. But in the last few months he is depressed, as his movement is slow, unable yo speak much. He remains as a silent spectator most of the time, and watches everyone. He sais he is losing interest in life, and as he has diaseases he feels he will not be well. We went to psychiatrist and he suggested to take d-venizep 100 tablet once a day. How is this medicine, what are side effects, and will this work??