I'm taking Isotretinoin 20 mg a day and have Erectile dysfunction. Is this normal?

I have been taking Roaccutane for my acne for over two months now. I am taking a very low dose of 20 mg a day over a 6 month period. My body weight is 92 Kgs and I am male 6'0 I have been having extreme difficulty getting an erection and maintaining one. My sex drive also seems lost entirely. Could this be due to Accutane?