A National Institute for Health Research “Signal” expert commentary refers to a systematic review which indicates that antidepressants are unsuitable / unhelpful for the treatment of depression in persons living with dementia.
Antidepressants do not help treat depression in people living with dementia. London: National Institute for Health Research Signal, January 8th 2019.
This relates to:
Dudas, R. Malouf, R. [and] McCleery, J. [et al] (2018). Antidepressants for treating depression in dementia. Cochrane Database of Systematic Reviews. August 31st 2018; 8: CD003944.
There is also an Executive Summary.