"just been giving another 5 month dosage of doxycycline, benzoyl peroxide (5%) and tretinoin (0.05%). it started off getting worse, but within two weeks i started to see a major improvement in my skin. i hardly get any acne anymore. just the scaring on my chest and on my face. hopefully this will help clear it all up. when i first started taking the doxycycline, i felt sick and had slight headaches but make sure to eat food first and then take the pills!! it really does help."