Am I taking the right dose of Roaccutane for my weight?

I've been prescribed 30mg Roaccutane per day since day 1 and have just started my 5th month at this dose, I weigh 63kg. My skin was completely clear and oil free at the end of the first month (very lucky I know!) but I'm concerned that I'm not going to hit the cumulative dose. The dermatologist keeps saying that my skin is clear so this might be my final month, I really don't want to relapse and go through all these side effects again! Should I insist that I stay on it?

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