My psych nurse swears it's the benzos that can cause dementia. She is tapering me slowly off them. I went from 2 mgs of lorazepam to now 3 mgs of diazepam. I started on 20 mgs of diazepam. But I also think other meds can cause problems. But I will be happy to be off benzos. Here in Washington they are really cracking down on all controlled meds. Best to just be off them.