"used for stubborn chin and jawline acne. i&#039;m a 23 y/o woman and 110lbs. i have been on a lower dose, 100mg once a day. i avoid dairy/calcium around the time i take this medication. my acne started to clear significantly at two months, by three months it was completely gone. i stopped taking antibiotics after three months and two months later my acne came back. now i&#039;m back on the same dose again. hopefully with time i will see long term improvement."