My mums in a nursing home, diagnosed with Vascular Dementia. due to very aggressive behaviour, being very vocal and abusive to everyone and long bouts of banging her head, she underwent a psychiatric assessment by the Community mental health team [CMHT ]. They prescribed Mirtazapine 30mgs which, taken at night was meant to calm her down and help her sleep. it didn't. The CMHT were called again, they upped it to 45mgs, still had little effect, if anything her behaviour has worsened. She has now been prescribed Promethazine [ as and when required ]. She has been given it one a day for the last four days, as well as the Mirtazapine at night. The staff have told us this has had no effect on her aggressive, abusive behaviour. She continues to bang her head, lash out at the nurse and carers, throw food and drinks at the staff and scream and shout foul and abusive language. Any advise please.