Fentanyl
"Very effective for pain. Have been pain meds for 11 yrs. Tried many others ie. hydrocodone, morphine, Percocet, oxymorphone, several others, but nothing worked like fentanyl. However, I have had some serious side effects. First I froze at 78 degrees inside our home in southwest florida. Then my left eye started getting really hazy. I thought my glasses were filthy. By the way it's still hazy after going through almost four months of withdrawal.  Then my right leg felt like dead weight at night. My left leg felt like it was wrapped with a very tight sock from below the knee to my ankle. I felt like I was going to vomit any minute, my mouth started to get watery. My gut hurt like anything. "