Not that i'm experienced or anything in this kind of thing.. but maybe its just not meant for you. My mother (my pharmacist) said that sometimes this drug just doesnt work... and then sometimes people take it over again and it just keeps getting worse and worse. She said that if that happends that you just keep trying other things... which sucks i know, but if it doesnt work after 3 try's.. i think its a lost cause. Then again.. the last time could be your lucky time..
Eh, good luck in your decision.. and i hope your acne the worst of luck