And every 4 days if i dont need it i would skip it and all i would use is 0.5 mg . My primary benzo is valium which i use at most 7.5 mg of which is less than 0.5 mg xanax and its good for me . I use the valium every 3 days so would using the xanax every 4 days 0.5 cause tolerance or withdrawal ? I dont want benzo withdrawal