Hi Everyone I'm new would appreciate views on Seroquel

My husband was diagnosed with Parkinson's in 2013 and a couple of years later with dementia.  Recently he had to reduce his madopar 200 (3 a day) to half because of hallucinations delusions and paranoia.  However even on half dose the side effects continue so yesterday he was prescribed the anti-psychotic drug Seroquel.  He takes his first one tonight I have read lots of negative reports on it... should I be concerned?