Is 40 mg/once daily of Accutane for 4 months enough to take care of back acne?

for your weigh, you should take 6 months of Accutane 40 mg day...I think 4 months is only 66% of the treatment.

My old professor used to say about Accutane in training, "We can get there in a speed boat or we can get there in a row boat." Point is, whether you're on 40mg/day or 160mg/day what matters is your total cumulative dose which most experts agree is between 120-150mg/kg. So if you weigh 140lbs, or 64kg, we take 64 x 120-150 = 7.7-9.6g total cumulative goal dose. Let's take the average here of 8.65g. At 40mg/day (row boat), this will take 216 days or 7 months to reach. 80mg/day? 108 days or 3.6 months (speed boat).This answer is not intended to give a medical opinion and does not substitute for medical advice. The information presented in this posting is for patients’ education only. As always, I encourage you to see your personal physician for further evaluation of your individual case.