Is my Accutane regimen sufficient?

I am 5,2 and weigh 120 pounds. I have been on it for five months total. But plan on being on it for six months. So far I have taken- 40 mg the first two months and increased to 60 mg for three months. I wanted to go back down to 20mg for my final sixth month. For my skin has been great and Ide like to wein off that way. My question is : have I obtained the proper Dosage? So that my acne will not relapse .?

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