What should my Accutance maintenance course be?

I am confused, as I received two info from two different doctors. One advised to take accutance in last week of each month for 6 months. The another said that he prefers that I take accutance twice weekly to make the dose stable in my blood, cause taking it for one week and then stopping for three weeks make the dose high in the blood and then low again. Please advise which one I should follow?