My cousin was on it for a few months, and the whole time he had really chapped lips. He stopped taking it because he was getting suicidal thoughts (apparently that's another side-effect. I don't know how common that is though). I'd recommend ProActiv, it's great for your skin but kinda expensive. Within 4 or 5 weeks of using ProActiv I went from having very severe acne to having a few, tiny zits occasionally.