Everyone here probably already knows about the risks of taking large amounts of ibuprofen. That is you really should not take this stuff other than on rare occasions and definitely not daily. If you hurt so bad you can't walk without it you are broke and need to heal up a bit.
But since so many hikers take it frequently, if not several times a day, I thought I would post some links. BTW the Vioxx they talk about was the prescription ibuprofen.
http://www.counterpunch.org/2015/07/...rofen-and-die/
http://well.blogs.nytimes.com/2012/1...ofen-use/?_r=0
https://www.zocdoc.com/answers/10112...rofen-everyday
http://www.everydayhealth.com/drugs/ibuprofen