Minocycline
"I'm 14 years old and I have pretty bad acne which started about a year and a half ago. A year ago, my mom took me to the dermatologist to see what they could do. They prescribed me to monocyline (100mg) once a day. I cleared up in about two weeks and my skin was flawless. After about two months, my acne stared to come back. I got off the pill for about a month and resumed it only to find out it wouldn't clear up my acne anymore. I stopped using it over the summer and started again once school started but twice a day this time. It stopped breakouts from becoming as bad as they could've been but didn't give me the same result as a year ago. My acne was still bad. All I am trying to put out there is stops working after a while. Good luck."