Accutane not working. Any suggestions?

i've been on accutane for 5 months now and absolutely nothing has changed in my skin/breakouts apart from dry lips and skin. I'm still breaking out like crazy and my breakouts dont look like they will be subsiding anytime soon. I dont know what to do :( my twin sister and I started accutane on the same day however she is on 20mg a day and I am on 40mg because my acne has always been worse and accutane is working for her (her skin is almost perfect now..)

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