I Am Taking Antidepressant Stalopam Lite And Metpure Xl 50

I am taking antidepressant stalopam lite and metpure xl 50 at morning last 1 year, yesterday doctors change my medicine tapper to metpure xl 50 at morning and alprazolam 0.25 at night, so please tell me how many days to recover from withdrawal symptoms of stalopam lite and is it right path of tappering....