"i&#039;m a 22 year old female who has struggled with acne since i was 11. i have been on doxycycline (100 mg/day) for the past few years but have struggled with taking it as prescribed (daily) because of the severity of the nausea/vomiting that would cause me to miss school. i talked to my dermatologist and she prescribed me a coated tablet, which was significantly easier to digest. down side: the coated tablet was much more expensive, even with good insurance. with the coated tablet, i notice no negative side-effects. this medication works fast. as soon as i would begin taking it for 5-7 days straight, i would notice a difference in my face, fewer new breakouts. as soon as i stopped, however, the breakouts would begin to slowly appear again."