The dose is very dependent on how your body responds to it, and how much of a prolactin issue you're covering up with it.
I've heard start .5/day, gradually increase. I did .5 for two days, and then 1 on the third day and the nausea was unbearable. Taper up slowly..
Supposedly people who are legitimately prescribed this are often in the 1-4mg/day range.
What are you using it for?