Pain
"I seem to have a different experience with it than most people. I&#039;ve only been given the injectable form in an IV while in the hospital before 2-3 times, in a fair degree of pain on each occasion. While it did work well for a short time, maybe 45min, I not only burned through it far faster than I did other pain medicines, but I got a nasty side effect of a truly horrific headache each time."