ok
i was prescribed this by my derm in my early 20s
(no previous use or AAS, nor using at the time)
weeks 1-4 the usual dryness, cracked lips and sore nose
5-12 utter hell for me - skin was dry worse than ever with spots and peeling, still cracked and sore lips, joints ached like hell
weeks 13-16 it started getting better in terms of acne going, still a fair bit of redness to facial skin, slitly less dryness every where else
4-5 years on and i have had probably 10 spots in total and have no fear of them breaking out again. the odd one or two come every few months
if you can get through the nitial stages of looking worse than you did before you took it you (IMO) should be fine
it gets worse before it gets better
that was my 'cycle' though and my acne was quite bad but not to the level of some i have seen so longer stints at higher doses maybe required
IMO if this doesnt work for you, im not sure what else will, saying that i did mine 4-5 years ago so there maybe something new out
good luck, hang in there