Can I increase my dosage of Accutane to shorten my treatment?

I'm currently on 80mg (2, 40 mg pills) a day. My dermatologist stated it would be roughly 6 months until I finished treatment. I'm handling minimal side effects, and was wondering if it would be ok to up the dosage to finish it faster? I found a calculator that told me I should be done in 3 1/2 months, finding out it was really 6 was pretty upsetting...

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