I have been on Benzaclin (5%BP) for about four months now. I was outdoors for a good part of the summer and although I was getting a lot of sun my face was not clean. So when I got back to civilization I had some fairly large cysts and other acne. Along with retin-a, the benzaclin really cleared me up. I would not reccomend its cousin Benzamyicin as you have to refrigerate it and it does not work as well. There are some dryness issues with it but its manageable.