Fact is Accutane can and does shed hair.
It's listed in the side effects.
*If* you are going to loose your hair to natural causes anyway, then Accutane could speed up the process for you no problem!
I speak from experience. I lost, over the course of the drug...3 months...a 3rd of the weight of my hair on it. Yes I would/will loose my hair anyway, but the speed of loss on that drug, for me, was silly.
After finishing the course, the hair loss slowed right down to where I don't notice it.