Is 80 mg of Accutane too high at 130 pounds? I am 5'1 and 130 pounds, 28 years old.

My dermatologist started me at 80mg and told me we would try it out for five months. He had me taking an antibiotic that cleared up my face temporarily, so I started accutane with an almost clear face. I say temporarily, because I've been on that antibiotic two other times and after three months the acne returns. Is the 80mg too much for my weight?