I know its the Lyrica I'm on. It causes drowsiness. The 100 mg is making me even more tired. I pretty much slept 1/2 the day away. I just couldn't stay awake for anything. I tried and tried to stay awake but just couldn't fight it. I will definatly be sure to let my doctor know that he shouldn't be doing these injections in my RSD arm. And will also only take the pump as a last resort. That is something that I really don't want to do.