"i&#039;ve been on this medication for adult cystic acne once before, about 3 years ago, for like 3 months i think and it did work for me...... but only for 6 months and then after that 6 months,  it came back with a vengeance! it came back very slowly, but it came back all the same.  i didn&#039;t want to go back on the mediation because i know it&#039;s not good to take it for long periods of time,  but 4 months ago,  i said  i can&#039;t take the pain anymore,  i&#039;m going to the doc again&quot; because no matter what acne washes i used,  no matter what topical acne systems i tried,  no matter what diet changes i made,  nothing worked. at all. i&#039;m currently back on doxy but have added topical clindamycin solution. has sped up healing! doxy does work."