That's the same dosage I did when I took Acutane 12 years ago. I ran it for 4 months and I was cleared for good, never had a problem since. I peeled off most of my scar tissue as welI. It looks as if I've never had acne.
Withn a few days of starting Acutane, you'll notice your face will be quite red and very dry. A few days later(at the one week point), you'll start to peel. I know you don't want to hear this, but your complexion will actually become worse before it becomes better. The worst part of it for me was the 2nd and 3rd month... I wear a uniform at work, and I couldn't put my peak-hat or my berret on w/o being in excessive pain. By the last month of the treatment, I was looking much better. Acutane is a fat soluable substance... so it will remain in your system for a while when you discontinue the drug. You'll still have the sides of dry/red/peeling skin for a least a month afterwards. Although it won't be nearly as severe as it was when you were on it.