"i started a cycle of doxycycline last june because of my horrible summer breakouts.  i experienced dramatic results after about 6 weeks; my skin had never been clearer.  i stopped taking it after 8 weeks and experienced  a few pimples here and there.  it is now february and i&#039;m pretty much back to square one with my acne. i started back on doxycycline last week.  best advice i can give: be patient, it takes a while but you&#039;ll eventually see great results."