I'm a 19 year old femal and I am on 50mg once daily, I started on it 2 and a half weeks ago and I am seeing no improvement, and it's actually getting so much worse. My acne was never really bad but I would always have a few pimples on my face, now I wake up with at least 3 BIG new pimples every morning. The doctor also gave me differin gel to use to spot treat pimples to speed up the process, but it does nothing. I am due to check in at the doctors after 6 weeks but I can't go another month until then looking like this, I don't even want to show my face in public, my skin has never been this bad. How long does it take to work???