My doctor wants to give me 40mg accutane?

Hello, I'm 19 y.o and my Wight is 59 kg, female. My doctor gave me 10 mg accutane and I will finish 2 months now, I felt that 10mg is too little for me, so I went to another doctor and she told me that she will start 40mg with me, is that save ? Changing from 10 to 40mg ? Should I start with her or should I take 20 , 30mg first ? Thank you!

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