Doxycycline
"I have  had moderate acne for 6 months now and I am 22. I am currently week one on doxycycline with with topical Retin A... I didn't actually read any reviews on this before taking it. Now that I have read it, I hope I don't get the horrible purging phase and really worried about relapse after stop taking it. At the moment I haven't had any new breakouts apart from one on my chin few days ago. There is a bit dryness  around my jawline in the mornings which is because of Retin A. But haven't had any side effects, plus some of my acne and acne marks have cleared.  Hopefully it clears up in a month as I have graduation... I will keep updating"