Hospital started Mom on Seroquel. What to expect?

Mom is in the hospital waiting placemat to an adult family home after seizures several weeks ago. She was irritated last night when I left and it looks like the hospital gave her Seroquel overnight for the agitation. Previously they had been giving her Ativan. What should I expect? What should I know about Seroquel? They have her on comfort care at the hospital and plan to move her to outpatient hospice once she is placed at an adult family home.