Keep aware of your moods, as accutane can cause depression.
I honestly don't know about drug interactions of accutane, but you might want to look into taking liver support like milk thistle. Accutane is very hard on the liver (that's why they make you take blood tests to make sure accutane is not destroying your liver). Of course you wouldn't want to prevent accutane from doing it's intended job and you wouldn't want to take something that neutralizes the drug.
So ask your doctor (I hate saying that) about supportive substances like milk thistle since you have already decided to take the accutane.