Don't be offended or take this the wrong way, but you sound like you need professional help. I don't know the reason behind your question, but 20pills of Ibuprofen is a lot !!. you will overdose on painkillers and the results won't be good (understatement). Passing out will be least of your problems when you OD on these pills. It will have an effect on every aspect of your body. There are a lot of other ways to deal with health issues (physical & mental), and ibuprofen is not the solution for a bad menustral cramps. Please consider other options for your problem.

why would you want to take 20 pills of Ibuprofen a day????!!!! first this sounds like a possible cry for help...if it's not and you really need that much medication then you need to see a pain management specialist. You are going to put a hole in your stomach or kill your liver!