Doxycycline
"I am 14, and I started using Doryx about a month ago. It hasn't worked for me, actually within the first few weeks my acne got worst, bigger, redder, and more painful pimples on my face.  In the dermatologist's office he said if this doesn't work in a month give me a call and we will give you something else. So I called him today, and he tells me to use it for another month. Do you really think I want my acne to get worse. NO! I was skeptical so I got online. Some reviews say it worked instantly, others say it took months, and some even say it never worked. I guess I will keep using it for another month, but if it doesn't clear my skin I will go back to my dermatologist."