Citalopram

Hi everyone,
My husband’s consultant recently prescribed Citalopram 10mg in the hope of lifting his mood, as he is struggling with apathy.
He has been taking it for 10 days now but seems to be occasionally confused and was hallucinating a little today. (Nothing as serious as when he had a nasty chest infection last year).
Has anyone else experienced something like this after taking Citalopram? It may not be connected but I’m just curious.
Many thanks.