My mother is 90. She's under a lot of stress lately living with my father who is 97. Details are not necessary for this inquiry. She asked her cardiologist for something to help her when times are very stressful and cause her much anxiety. He prescribed colnazepam. She takes atenolol and agrenox. She has a pacemaker. Is this drug safe? Will it cause any confusion in her thinking? She was told to take it once a day.