I had to go on accutane for acne, and before I started I had to get some blood work done, as the doc told me that it can jack ya up.
But anyway I think my dosage was a bit higher that 20mg, but what I do know is that after about a wk or so on the stuff, i was drier than a desert. So I guess with that dosage you'd be o.k. but remember always carry around a tube of chap stick as you will use it! And again I'm not a medical expert just speaking from experience when on it, I'll look around to see if I can see what dosage I was on. I'll post it when I find it.