Another proactiv praiser here!
I will say that when I first started using it over a year ago though, I had a VERY long adjustment period with it. It had all of those things others here have mentioned: dry, painful, red, burned looking, skin. They tell you to use all three products 2x a day. I did that initially til i couldn't handle it anymore (3 or 4 days maybe). Backed off for a week, let it calm down, and VERY slowly eased back into it. It took about 3 months, I would say. On average, now, I use all 3 products once a day and the astringents/clarifying/toner stuff a second time. Total success.
Nothing else has worked.
I called couple of times in the beginning, and they told me to do what I did above. And to save all the bottles, empty or full, and if I wasn't happy with it, to send the bottles back for a refund (minus shipping).
The one major drawback though to this stuff is that it makes your skin very sensitive to the sun. Then again, I think tetracycline does too.
Here is a link to their key ingredients:proactiv ingredients
No I don't sell the stuff. Just someone who would avoid eye contact and social interactions with people from the painful, unsightly zits.