1.25mg (break 2.5mg tabs) for years, do not know how I would have managed without it, worked for me.
With a lot of improvement in last 12 months have been hoping to get off it, went a couple of days without it and noticed I could manage on less sleep, woke up more clear headed but it just did not last because once my cognitive symptoms come back from exertion I have to have it, just still no biological clock 95% of time even though I have got myself to about 80%-85% functioning.