This is a medicated anti-perspirant. I got this as I tried two brands and they do not work. I was recommended this by a few people. You have to apply this the night before and wash it off the next morning. You do not have to reapply. This claims to keep underarms dry for 3-5 days. It has a very strong chemical scent first of all. I did as the instructions said. Sadly after 1-2 hours, I could feel my underarms a little damp. I think the strong chemicals in this irritated my skin as well as it got itchy. Quite disappointed as this is very expensive.