I was on doxycycline and tretinoin for 3 1/2 months, it works slightly after 1 month and then it stops working. Then when you get off the product you have a flare up that is terrible, its awful. My hair starting falling out and I dont know why, so i stopped all antobiotics just in case, but my hair is continuing to fall out after a month and I am only 19 :( i am so scared right now.