My father was on Quitiapine, in an attempt to alleiviate his paranoid delusions and agression (it was partially successful). He was on a much higher dose - eventally rising to 350mg daily, and we were told that the dosage could be substantially increased if necessary.
25mg is really a very low dose.
There have been concerns about the risk of strokes in dementia patients prescribed anti-pyschotic mediations (of which this is one). However, as far as I'm aware, Quitiapine is one of the newer drugs and is considered safer than the older ones (such as Olanzapine).
It is also a question of weighing the risks against the benefits. A small increase in risk of stroke may well be justified - it all depends on the impact of your mum's anxiety and agitation on both her life and that of those around her.
In my father's case the paranoia and agression were ubearable and making all our lives a literal hell on earth. Indeed, towards the end it became so acute that he was sectioned under the mental health act and admitted involuntarily to hospital. Sadly he died a few weeks later, although this was in no way connected to the Quitiapine, which he'd been taking for years.
