Suggest Treatment For Bipolar Depression And Parkinson's Disease

Question: I need second opinion on tretment bipolar depression and parkinson at the same time. I need opinion on 6 tablets that are taken for it and inspect possible interaction.

Thank you for the pick up Dr. XXXXXXX XXXXXXX
I only can describe things you ask me because i dont have papers around me now. And will not have them for a while. Now, my father was diagnosed 10 years ago with bipolar depression. He used to have strong depressions (treated also in hospital) followed by mania phases that took months. First years before any treeatment took on positivelly on him (we needed to change medicaments few times as no good results apeared) depressions lasted say two months, followed by 2 months relativelly ok phase and then strong mania symptoms (money spending, aggression etc) for couple of months.. after I guess he started to take depakine chorono alongside with Mirtazen (but also was some time on Coaxil) and his symptoms have been nicelly subtled. The only phase we were more aware was depression state. It always took in autumn and father needed to seek hospital treatment (strong depression). This happend every other year. But was not followed by mania phases. And we were happy for that.. so we used to live with fact that from time to time a 75 year old father would probably fall into stronger depression and seek hospital "reset". That worked so far. 5 years ago he started with hand trembling and it was not treated until two years ago doctors diagnosed parkinson. Trmbling is now very strong and milder in other hand too. Father was not very disciplined with medication taking, but only 9 months ago we changed doctor (for parkinson) and he started to take Corbilta. As for parkinson my father suffer mostly tremor (hands), and slowed movement. And it got worsened. He does not suffer from loss of posture or balance. No speech changes. Doctor says father had to be treated sooner and that level of corbilta will step by step needed to be increased so we have to wait I guess. I am surprised my father needs to take also nimvasted and quetiapine with quetiapine being antipsychotic and more receptor (even dopamin) anragonist - i remember that doctors had some speculation over if father does not exert also some alzhaimer symptoms but i do not believe, but i am affraid doctors (not the one specialist for oarkinson but rather doctors from hospital) add those pills just for the sake of treating/subtling the symptoms in any fashion.

Usually my father got depression phase when he stopped taking antidepresive pills or just underdosaged himself, or even when for some uknown reason to me his doctor changed the prescription, usually after my dad raised issues he can not sleep or that he is nonstop tired etc. But id did alwas happen for some extraordinary reason. But in general he was stabilised. With parkinson i am aware of corbilta or other levodopa based pills. So we wait what helps his tremor... But i am affraid that nimvastid and quetiapine is on top of the others , trying to treat symptoms more of dementia which i dont see in any significant presence - he still has good memory, never lost himself, talks politics.. I am not taking into account incontinencia, vomiting, naussea, salivating and therefore some anxiety or annoyence, even if in depression as any sign of demencia. I read something about dementia but it does not look to me he has to be treated for it. Ican not tell more as i do not have papers with me why quetiapine, nimvasted and when they have been introduced.