I had surgery a couple of days ago. So I'm on 600mg ibuprofen at the moment. I drank caffeine whole day before going to school. When my school started, I was having pain. So I took an ibuprofen. In less than two minutes, I felt weird, tired, distracted and not able to think clear anymore. I also felt weak as crap. It was like a weird kind of being high. I would not recommend doing this.