This is what my mum was initially changed too, it’s a depot (regular injection) and seems to be a popular first choice alternative. It didn’t work for my mum though. Anyone else have experience of this?
I cannot recommend fluphenazine as a replacement, it is a low-potency medication and to get a similar antipsychotic effect the dose needs to be quite high, meaning sedation and low blood pressure. Please see my post about alternatives.