I used to be a constant user of Tylenol, it was what I reached for anytime that I was in pain and needing something to take. After a while I found myself taking eight or more pills of this in a day because it just was not killing the pain and I felt like it was coming back really fast and that I needed more and more. I then found myself really sick and the doctors told me that my liver and kidneys were beginning to fail because of the constant use of Tylenol and all of the acetaminophen in it. This does work to kill some pain and is great for the occasional use, but it is not something that should be used over and over again and not if you are in constant pain, it will do more damage than it does help. Effectiveness It is effective against a headache and mild pain, but it does not have the power to keep you not hurting if you have something more serious. Ease of Use It is very easy to use like any other medication is, you just take it and wait for it to make you feel better. Immediacy This kicks in pretty fast but you find yourself needing to take more after only a few hours and find that the results of it do not last for very long.