Can 5mg of accutane do me any harm? 6-12 months treatment .

Well, yes: Accutane is a very powerful drug that can be very helpful for the treatment of cystic acne. It has a whole host of possible side effects however, from fairly mild like dry skin, to very severe like psychosis. It's super important to not get pregnant while taking Accutane because it causes significant birth defects. If you are taking Accutane you need close follow up with a doctor.