This is one of my holy grail items, i have no idea where I would be without it.
The first time use, I remember it not working very well but gave it a second try and never looked back.
What I remember doing differently the second time round is I have popped the pimple and then put the patch whereas the first time, I just put it on a under-the-skin pimple.
Put it on at night and the pimple dies down the next day - fully gone by the 2nd/3rd day.